diff --git a/Lib/test/test_zipfile.py b/Lib/test/test_zipfile.py
index d3a359f..26dd09b 100644
--- a/Lib/test/test_zipfile.py
+++ b/Lib/test/test_zipfile.py
@@ -10,10 +10,9 @@
 
 
 from tempfile import TemporaryFile
-from random import randint, random
-from unittest import skipUnless
+from random import randint, random, getrandbits
 
-from test.support import (TESTFN, run_unittest, findfile, unlink,
+from test.support import (TESTFN, findfile, unlink,
                           requires_zlib, requires_bz2, requires_lzma,
                           captured_stdout)
 
@@ -27,14 +26,24 @@
                    ('ziptest2dir/ziptest3dir/_ziptest3', 'azsxdcfvgb'),
                    ('ziptest2dir/ziptest3dir/ziptest4dir/_ziptest3', '6y7u8i9o0p')]
 
+def get_files(test):
+    yield TESTFN2
+    with TemporaryFile() as f:
+        yield f
+        test.assertFalse(f.closed)
+    with io.BytesIO() as f:
+        yield f
+        test.assertFalse(f.closed)
 
-class TestsWithSourceFile(unittest.TestCase):
+class AbstractTestsWithSourceFile:
+    @classmethod
+    def setUpClass(cls):
+        cls.line_gen = [bytes("Zipfile test line %d. random float: %f\n" %
+                              (i, random()), "ascii")
+                        for i in range(FIXEDTEST_SIZE)]
+        cls.data = b''.join(cls.line_gen)
+
     def setUp(self):
-        self.line_gen = (bytes("Zipfile test line %d. random float: %f" %
-                               (i, random()), "ascii")
-                         for i in range(FIXEDTEST_SIZE))
-        self.data = b'\n'.join(self.line_gen) + b'\n'
-
         # Make a source file with some lines
         with open(TESTFN, "wb") as fp:
             fp.write(self.data)
@@ -97,12 +106,10 @@
 
             # Check that testzip doesn't raise an exception
             zipfp.testzip()
-        if not isinstance(f, str):
-            f.close()
 
-    def test_stored(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_test(f, zipfile.ZIP_STORED)
+    def test_basic(self):
+        for f in get_files(self):
+            self.zip_test(f, self.compression)
 
     def zip_open_test(self, f, compression):
         self.make_test_archive(f, compression)
@@ -127,30 +134,10 @@
 
             self.assertEqual(b''.join(zipdata1), self.data)
             self.assertEqual(b''.join(zipdata2), self.data)
-        if not isinstance(f, str):
-            f.close()
 
-    def test_open_stored(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_open_test(f, zipfile.ZIP_STORED)
-
-    def test_open_via_zip_info(self):
-        # Create the ZIP archive
-        with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED) as zipfp:
-            zipfp.writestr("name", "foo")
-            zipfp.writestr("name", "bar")
-
-        with zipfile.ZipFile(TESTFN2, "r") as zipfp:
-            infos = zipfp.infolist()
-            data = b""
-            for info in infos:
-                with zipfp.open(info) as zipopen:
-                    data += zipopen.read()
-            self.assertTrue(data == b"foobar" or data == b"barfoo")
-            data = b""
-            for info in infos:
-                data += zipfp.read(info)
-            self.assertTrue(data == b"foobar" or data == b"barfoo")
+    def test_open(self):
+        for f in get_files(self):
+            self.zip_open_test(f, self.compression)
 
     def zip_random_open_test(self, f, compression):
         self.make_test_archive(f, compression)
@@ -166,36 +153,17 @@
                     zipdata1.append(read_data)
 
             self.assertEqual(b''.join(zipdata1), self.data)
-        if not isinstance(f, str):
-            f.close()
 
-    def test_random_open_stored(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_random_open_test(f, zipfile.ZIP_STORED)
-
-    def test_univeral_readaheads(self):
-        f = io.BytesIO()
-
-        data = b'a\r\n' * 16 * 1024
-        zipfp = zipfile.ZipFile(f, 'w', zipfile.ZIP_STORED)
-        zipfp.writestr(TESTFN, data)
-        zipfp.close()
-
-        data2 = b''
-        zipfp = zipfile.ZipFile(f, 'r')
-        with zipfp.open(TESTFN, 'rU') as zipopen:
-            for line in zipopen:
-                data2 += line
-        zipfp.close()
-
-        self.assertEqual(data, data2.replace(b'\n', b'\r\n'))
+    def test_random_open(self):
+        for f in get_files(self):
+            self.zip_random_open_test(f, self.compression)
 
     def zip_readline_read_test(self, f, compression):
         self.make_test_archive(f, compression)
 
         # Read the ZIP archive
-        zipfp = zipfile.ZipFile(f, "r")
-        with zipfp.open(TESTFN) as zipopen:
+        with zipfile.ZipFile(f, "r") as zipfp, \
+             zipfp.open(TESTFN) as zipopen:
             data = b''
             while True:
                 read = zipopen.readline()
@@ -209,9 +177,11 @@
                 data += read
 
         self.assertEqual(data, self.data)
-        zipfp.close()
-        if not isinstance(f, str):
-            f.close()
+
+    def test_readline_read(self):
+        # Issue #7610: calls to readline() interleaved with calls to read().
+        for f in get_files(self):
+            self.zip_readline_read_test(f, self.compression)
 
     def zip_readline_test(self, f, compression):
         self.make_test_archive(f, compression)
@@ -221,9 +191,11 @@
             with zipfp.open(TESTFN) as zipopen:
                 for line in self.line_gen:
                     linedata = zipopen.readline()
-                    self.assertEqual(linedata, line + '\n')
-        if not isinstance(f, str):
-            f.close()
+                    self.assertEqual(linedata, line)
+
+    def test_readline(self):
+        for f in get_files(self):
+            self.zip_readline_test(f, self.compression)
 
     def zip_readlines_test(self, f, compression):
         self.make_test_archive(f, compression)
@@ -233,9 +205,11 @@
             with zipfp.open(TESTFN) as zipopen:
                 ziplines = zipopen.readlines()
             for line, zipline in zip(self.line_gen, ziplines):
-                self.assertEqual(zipline, line + '\n')
-        if not isinstance(f, str):
-            f.close()
+                self.assertEqual(zipline, line)
+
+    def test_readlines(self):
+        for f in get_files(self):
+            self.zip_readlines_test(f, self.compression)
 
     def zip_iterlines_test(self, f, compression):
         self.make_test_archive(f, compression)
@@ -244,173 +218,64 @@
         with zipfile.ZipFile(f, "r") as zipfp:
             with zipfp.open(TESTFN) as zipopen:
                 for line, zipline in zip(self.line_gen, zipopen):
-                    self.assertEqual(zipline, line + '\n')
-        if not isinstance(f, str):
-            f.close()
+                    self.assertEqual(zipline, line)
 
-    def test_readline_read_stored(self):
-        # Issue #7610: calls to readline() interleaved with calls to read().
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_readline_read_test(f, zipfile.ZIP_STORED)
+    def test_iterlines(self):
+        for f in get_files(self):
+            self.zip_iterlines_test(f, self.compression)
 
-    def test_readline_stored(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_readline_test(f, zipfile.ZIP_STORED)
-
-    def test_readlines_stored(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_readlines_test(f, zipfile.ZIP_STORED)
-
-    def test_iterlines_stored(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_iterlines_test(f, zipfile.ZIP_STORED)
-
-    @requires_zlib
-    def test_deflated(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_test(f, zipfile.ZIP_DEFLATED)
-
-
-    @requires_zlib
-    def test_open_deflated(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_open_test(f, zipfile.ZIP_DEFLATED)
-
-    @requires_zlib
-    def test_random_open_deflated(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_random_open_test(f, zipfile.ZIP_DEFLATED)
-
-    @requires_zlib
-    def test_readline_read_deflated(self):
-        # Issue #7610: calls to readline() interleaved with calls to read().
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_readline_read_test(f, zipfile.ZIP_DEFLATED)
-
-    @requires_zlib
-    def test_readline_deflated(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_readline_test(f, zipfile.ZIP_DEFLATED)
-
-    @requires_zlib
-    def test_readlines_deflated(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_readlines_test(f, zipfile.ZIP_DEFLATED)
-
-    @requires_zlib
-    def test_iterlines_deflated(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_iterlines_test(f, zipfile.ZIP_DEFLATED)
-
-    @requires_zlib
     def test_low_compression(self):
         """Check for cases where compressed data is larger than original."""
         # Create the ZIP archive
-        with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_DEFLATED) as zipfp:
+        with zipfile.ZipFile(TESTFN2, "w", self.compression) as zipfp:
             zipfp.writestr("strfile", '12')
 
         # Get an open object for strfile
-        with zipfile.ZipFile(TESTFN2, "r", zipfile.ZIP_DEFLATED) as zipfp:
+        with zipfile.ZipFile(TESTFN2, "r", self.compression) as zipfp:
             with zipfp.open("strfile") as openobj:
                 self.assertEqual(openobj.read(1), b'1')
                 self.assertEqual(openobj.read(1), b'2')
 
-    @requires_bz2
-    def test_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_test(f, zipfile.ZIP_BZIP2)
+    def test_writestr_compression(self):
+        zipfp = zipfile.ZipFile(TESTFN2, "w")
+        zipfp.writestr("b.txt", "hello world", compress_type=self.compression)
+        info = zipfp.getinfo('b.txt')
+        self.assertEqual(info.compress_type, self.compression)
 
-    @requires_bz2
-    def test_open_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_open_test(f, zipfile.ZIP_BZIP2)
+    def test_read_return_size(self):
+        # Issue #9837: ZipExtFile.read() shouldn't return more bytes
+        # than requested.
+        for test_size in (1, 4095, 4096, 4097, 16384):
+            file_size = test_size + 1
+            junk = getrandbits(8 * file_size).to_bytes(file_size, 'little')
+            with zipfile.ZipFile(io.BytesIO(), "w", self.compression) as zipf:
+                zipf.writestr('foo', junk)
+                with zipf.open('foo', 'r') as fp:
+                    buf = fp.read(test_size)
+                    self.assertEqual(len(buf), test_size)
 
-    @requires_bz2
-    def test_random_open_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_random_open_test(f, zipfile.ZIP_BZIP2)
+    def tearDown(self):
+        unlink(TESTFN)
+        unlink(TESTFN2)
 
-    @requires_bz2
-    def test_readline_read_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_readline_read_test(f, zipfile.ZIP_BZIP2)
 
-    @requires_bz2
-    def test_readline_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_readline_test(f, zipfile.ZIP_BZIP2)
+class StoredTestsWithSourceFile(AbstractTestsWithSourceFile,
+                                unittest.TestCase):
+    compression = zipfile.ZIP_STORED
+    test_low_compression = None
 
-    @requires_bz2
-    def test_readlines_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_readlines_test(f, zipfile.ZIP_BZIP2)
+    def zip_test_writestr_permissions(self, f, compression):
+        # Make sure that writestr creates files with mode 0600,
+        # when it is passed a name rather than a ZipInfo instance.
 
-    @requires_bz2
-    def test_iterlines_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_iterlines_test(f, zipfile.ZIP_BZIP2)
+        self.make_test_archive(f, compression)
+        with zipfile.ZipFile(f, "r") as zipfp:
+            zinfo = zipfp.getinfo('strfile')
+            self.assertEqual(zinfo.external_attr, 0o600 << 16)
 
-    @requires_bz2
-    def test_low_compression_bzip2(self):
-        """Check for cases where compressed data is larger than original."""
-        # Create the ZIP archive
-        with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_BZIP2) as zipfp:
-            zipfp.writestr("strfile", '12')
-
-        # Get an open object for strfile
-        with zipfile.ZipFile(TESTFN2, "r", zipfile.ZIP_BZIP2) as zipfp:
-            with zipfp.open("strfile") as openobj:
-                self.assertEqual(openobj.read(1), b'1')
-                self.assertEqual(openobj.read(1), b'2')
-
-    @requires_lzma
-    def test_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_test(f, zipfile.ZIP_LZMA)
-
-    @requires_lzma
-    def test_open_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_open_test(f, zipfile.ZIP_LZMA)
-
-    @requires_lzma
-    def test_random_open_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_random_open_test(f, zipfile.ZIP_LZMA)
-
-    @requires_lzma
-    def test_readline_read_lzma(self):
-        # Issue #7610: calls to readline() interleaved with calls to read().
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_readline_read_test(f, zipfile.ZIP_LZMA)
-
-    @requires_lzma
-    def test_readline_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_readline_test(f, zipfile.ZIP_LZMA)
-
-    @requires_lzma
-    def test_readlines_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_readlines_test(f, zipfile.ZIP_LZMA)
-
-    @requires_lzma
-    def test_iterlines_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_iterlines_test(f, zipfile.ZIP_LZMA)
-
-    @requires_lzma
-    def test_low_compression_lzma(self):
-        """Check for cases where compressed data is larger than original."""
-        # Create the ZIP archive
-        with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_LZMA) as zipfp:
-            zipfp.writestr("strfile", '12')
-
-        # Get an open object for strfile
-        with zipfile.ZipFile(TESTFN2, "r", zipfile.ZIP_LZMA) as zipfp:
-            with zipfp.open("strfile") as openobj:
-                self.assertEqual(openobj.read(1), b'1')
-                self.assertEqual(openobj.read(1), b'2')
+    def test_writestr_permissions(self):
+        for f in get_files(self):
+            self.zip_test_writestr_permissions(f, zipfile.ZIP_STORED)
 
     def test_absolute_arcnames(self):
         with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED) as zipfp:
@@ -470,7 +335,26 @@
             with open(TESTFN, "rb") as f:
                 self.assertEqual(zipfp.read(TESTFN), f.read())
 
-    @requires_zlib
+    def test_write_to_readonly(self):
+        """Check that trying to call write() on a readonly ZipFile object
+        raises a RuntimeError."""
+        with zipfile.ZipFile(TESTFN2, mode="w") as zipfp:
+            zipfp.writestr("somefile.txt", "bogus")
+
+        with zipfile.ZipFile(TESTFN2, mode="r") as zipfp:
+            self.assertRaises(RuntimeError, zipfp.write, TESTFN)
+
+    def test_add_file_before_1980(self):
+        # Set atime and mtime to 1970-01-01
+        os.utime(TESTFN, (0, 0))
+        with zipfile.ZipFile(TESTFN2, "w") as zipfp:
+            self.assertRaises(ValueError, zipfp.write, TESTFN)
+
+@requires_zlib
+class DeflateTestsWithSourceFile(AbstractTestsWithSourceFile,
+                                 unittest.TestCase):
+    compression = zipfile.ZIP_DEFLATED
+
     def test_per_file_compression(self):
         """Check that files within a Zip archive can have different
         compression options."""
@@ -482,15 +366,263 @@
             self.assertEqual(sinfo.compress_type, zipfile.ZIP_STORED)
             self.assertEqual(dinfo.compress_type, zipfile.ZIP_DEFLATED)
 
-    def test_write_to_readonly(self):
-        """Check that trying to call write() on a readonly ZipFile object
-        raises a RuntimeError."""
-        with zipfile.ZipFile(TESTFN2, mode="w") as zipfp:
-            zipfp.writestr("somefile.txt", "bogus")
+@requires_bz2
+class Bzip2TestsWithSourceFile(AbstractTestsWithSourceFile,
+                               unittest.TestCase):
+    compression = zipfile.ZIP_BZIP2
 
-        with zipfile.ZipFile(TESTFN2, mode="r") as zipfp:
-            self.assertRaises(RuntimeError, zipfp.write, TESTFN)
+@requires_lzma
+class LzmaTestsWithSourceFile(AbstractTestsWithSourceFile,
+                              unittest.TestCase):
+    compression = zipfile.ZIP_LZMA
 
+
+class AbstractTestZip64InSmallFiles:
+    # These tests test the ZIP64 functionality without using large files,
+    # see test_zipfile64 for proper tests.
+
+    @classmethod
+    def setUpClass(cls):
+        line_gen = (bytes("Test of zipfile line %d." % i, "ascii")
+                    for i in range(0, FIXEDTEST_SIZE))
+        cls.data = b'\n'.join(line_gen)
+
+    def setUp(self):
+        self._limit = zipfile.ZIP64_LIMIT
+        zipfile.ZIP64_LIMIT = 5
+
+        # Make a source file with some lines
+        with open(TESTFN, "wb") as fp:
+            fp.write(self.data)
+
+    def zip_test(self, f, compression):
+        # Create the ZIP archive
+        with zipfile.ZipFile(f, "w", compression, allowZip64=True) as zipfp:
+            zipfp.write(TESTFN, "another.name")
+            zipfp.write(TESTFN, TESTFN)
+            zipfp.writestr("strfile", self.data)
+
+        # Read the ZIP archive
+        with zipfile.ZipFile(f, "r", compression) as zipfp:
+            self.assertEqual(zipfp.read(TESTFN), self.data)
+            self.assertEqual(zipfp.read("another.name"), self.data)
+            self.assertEqual(zipfp.read("strfile"), self.data)
+
+            # Print the ZIP directory
+            fp = io.StringIO()
+            zipfp.printdir(fp)
+
+            directory = fp.getvalue()
+            lines = directory.splitlines()
+            self.assertEqual(len(lines), 4) # Number of files + header
+
+            self.assertIn('File Name', lines[0])
+            self.assertIn('Modified', lines[0])
+            self.assertIn('Size', lines[0])
+
+            fn, date, time_, size = lines[1].split()
+            self.assertEqual(fn, 'another.name')
+            self.assertTrue(time.strptime(date, '%Y-%m-%d'))
+            self.assertTrue(time.strptime(time_, '%H:%M:%S'))
+            self.assertEqual(size, str(len(self.data)))
+
+            # Check the namelist
+            names = zipfp.namelist()
+            self.assertEqual(len(names), 3)
+            self.assertIn(TESTFN, names)
+            self.assertIn("another.name", names)
+            self.assertIn("strfile", names)
+
+            # Check infolist
+            infos = zipfp.infolist()
+            names = [i.filename for i in infos]
+            self.assertEqual(len(names), 3)
+            self.assertIn(TESTFN, names)
+            self.assertIn("another.name", names)
+            self.assertIn("strfile", names)
+            for i in infos:
+                self.assertEqual(i.file_size, len(self.data))
+
+            # check getinfo
+            for nm in (TESTFN, "another.name", "strfile"):
+                info = zipfp.getinfo(nm)
+                self.assertEqual(info.filename, nm)
+                self.assertEqual(info.file_size, len(self.data))
+
+            # Check that testzip doesn't raise an exception
+            zipfp.testzip()
+
+    def test_basic(self):
+        for f in get_files(self):
+            self.zip_test(f, self.compression)
+
+    def tearDown(self):
+        zipfile.ZIP64_LIMIT = self._limit
+        unlink(TESTFN)
+        unlink(TESTFN2)
+
+
+class StoredTestZip64InSmallFiles(AbstractTestZip64InSmallFiles,
+                                  unittest.TestCase):
+    compression = zipfile.ZIP_STORED
+
+    def large_file_exception_test(self, f, compression):
+        with zipfile.ZipFile(f, "w", compression) as zipfp:
+            self.assertRaises(zipfile.LargeZipFile,
+                              zipfp.write, TESTFN, "another.name")
+
+    def large_file_exception_test2(self, f, compression):
+        with zipfile.ZipFile(f, "w", compression) as zipfp:
+            self.assertRaises(zipfile.LargeZipFile,
+                              zipfp.writestr, "another.name", self.data)
+
+    def test_large_file_exception(self):
+        for f in get_files(self):
+            self.large_file_exception_test(f, zipfile.ZIP_STORED)
+            self.large_file_exception_test2(f, zipfile.ZIP_STORED)
+
+    def test_absolute_arcnames(self):
+        with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED,
+                             allowZip64=True) as zipfp:
+            zipfp.write(TESTFN, "/absolute")
+
+        with zipfile.ZipFile(TESTFN2, "r", zipfile.ZIP_STORED) as zipfp:
+            self.assertEqual(zipfp.namelist(), ["absolute"])
+
+@requires_zlib
+class DeflateTestZip64InSmallFiles(AbstractTestZip64InSmallFiles,
+                                   unittest.TestCase):
+    compression = zipfile.ZIP_DEFLATED
+
+@requires_bz2
+class Bzip2TestZip64InSmallFiles(AbstractTestZip64InSmallFiles,
+                                 unittest.TestCase):
+    compression = zipfile.ZIP_BZIP2
+
+@requires_lzma
+class LzmaTestZip64InSmallFiles(AbstractTestZip64InSmallFiles,
+                                unittest.TestCase):
+    compression = zipfile.ZIP_LZMA
+
+
+class PyZipFileTests(unittest.TestCase):
+    def assertCompiledIn(self, name, namelist):
+        if name + 'o' not in namelist:
+            self.assertIn(name + 'c', namelist)
+
+    def test_write_pyfile(self):
+        with TemporaryFile() as t, zipfile.PyZipFile(t, "w") as zipfp:
+            fn = __file__
+            if fn.endswith('.pyc') or fn.endswith('.pyo'):
+                path_split = fn.split(os.sep)
+                if os.altsep is not None:
+                    path_split.extend(fn.split(os.altsep))
+                if '__pycache__' in path_split:
+                    fn = importlib.util.source_from_cache(fn)
+                else:
+                    fn = fn[:-1]
+
+            zipfp.writepy(fn)
+
+            bn = os.path.basename(fn)
+            self.assertNotIn(bn, zipfp.namelist())
+            self.assertCompiledIn(bn, zipfp.namelist())
+
+        with TemporaryFile() as t, zipfile.PyZipFile(t, "w") as zipfp:
+            fn = __file__
+            if fn.endswith(('.pyc', '.pyo')):
+                fn = fn[:-1]
+
+            zipfp.writepy(fn, "testpackage")
+
+            bn = "%s/%s" % ("testpackage", os.path.basename(fn))
+            self.assertNotIn(bn, zipfp.namelist())
+            self.assertCompiledIn(bn, zipfp.namelist())
+
+    def test_write_python_package(self):
+        import email
+        packagedir = os.path.dirname(email.__file__)
+
+        with TemporaryFile() as t, zipfile.PyZipFile(t, "w") as zipfp:
+            zipfp.writepy(packagedir)
+
+            # Check for a couple of modules at different levels of the
+            # hierarchy
+            names = zipfp.namelist()
+            self.assertCompiledIn('email/__init__.py', names)
+            self.assertCompiledIn('email/mime/text.py', names)
+
+    def test_write_with_optimization(self):
+        import email
+        packagedir = os.path.dirname(email.__file__)
+        # use .pyc if running test in optimization mode,
+        # use .pyo if running test in debug mode
+        optlevel = 1 if __debug__ else 0
+        ext = '.pyo' if optlevel == 1 else '.pyc'
+
+        with TemporaryFile() as t, \
+                 zipfile.PyZipFile(t, "w", optimize=optlevel) as zipfp:
+            zipfp.writepy(packagedir)
+
+            names = zipfp.namelist()
+            self.assertIn('email/__init__' + ext, names)
+            self.assertIn('email/mime/text' + ext, names)
+
+    def test_write_python_directory(self):
+        os.mkdir(TESTFN2)
+        try:
+            with open(os.path.join(TESTFN2, "mod1.py"), "w") as fp:
+                fp.write("print(42)\n")
+
+            with open(os.path.join(TESTFN2, "mod2.py"), "w") as fp:
+                fp.write("print(42 * 42)\n")
+
+            with open(os.path.join(TESTFN2, "mod2.txt"), "w") as fp:
+                fp.write("bla bla bla\n")
+
+            with TemporaryFile() as t, zipfile.PyZipFile(t, "w") as zipfp:
+                zipfp.writepy(TESTFN2)
+
+                names = zipfp.namelist()
+                self.assertCompiledIn('mod1.py', names)
+                self.assertCompiledIn('mod2.py', names)
+                self.assertNotIn('mod2.txt', names)
+
+        finally:
+            shutil.rmtree(TESTFN2)
+
+    def test_write_non_pyfile(self):
+        with TemporaryFile() as t, zipfile.PyZipFile(t, "w") as zipfp:
+            with open(TESTFN, 'w') as f:
+                f.write('most definitely not a python file')
+            self.assertRaises(RuntimeError, zipfp.writepy, TESTFN)
+            os.remove(TESTFN)
+
+    def test_write_pyfile_bad_syntax(self):
+        os.mkdir(TESTFN2)
+        try:
+            with open(os.path.join(TESTFN2, "mod1.py"), "w") as fp:
+                fp.write("Bad syntax in python file\n")
+
+            with TemporaryFile() as t, zipfile.PyZipFile(t, "w") as zipfp:
+                # syntax errors are printed to stdout
+                with captured_stdout() as s:
+                    zipfp.writepy(os.path.join(TESTFN2, "mod1.py"))
+
+                self.assertIn("SyntaxError", s.getvalue())
+
+                # as it will not have compiled the python file, it will
+                # include the .py file not .pyc or .pyo
+                names = zipfp.namelist()
+                self.assertIn('mod1.py', names)
+                self.assertNotIn('mod1.pyc', names)
+                self.assertNotIn('mod1.pyo', names)
+
+        finally:
+            shutil.rmtree(TESTFN2)
+
+
+class ExtractTests(unittest.TestCase):
     def test_extract(self):
         with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED) as zipfp:
             for fpath, fdata in SMALL_TEST_DATA:
@@ -636,47 +768,40 @@
 
             os.remove(TESTFN2)
 
-    def test_writestr_compression_stored(self):
-        zipfp = zipfile.ZipFile(TESTFN2, "w")
-        zipfp.writestr("a.txt", "hello world", compress_type=zipfile.ZIP_STORED)
-        info = zipfp.getinfo('a.txt')
-        self.assertEqual(info.compress_type, zipfile.ZIP_STORED)
 
-    @requires_zlib
-    def test_writestr_compression_deflated(self):
-        zipfp = zipfile.ZipFile(TESTFN2, "w")
-        zipfp.writestr("b.txt", "hello world", compress_type=zipfile.ZIP_DEFLATED)
-        info = zipfp.getinfo('b.txt')
-        self.assertEqual(info.compress_type, zipfile.ZIP_DEFLATED)
+class OtherTests(unittest.TestCase):
+    def test_open_via_zip_info(self):
+        # Create the ZIP archive
+        with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED) as zipfp:
+            zipfp.writestr("name", "foo")
+            zipfp.writestr("name", "bar")
 
-    @requires_bz2
-    def test_writestr_compression_bzip2(self):
-        zipfp = zipfile.ZipFile(TESTFN2, "w")
-        zipfp.writestr("b.txt", "hello world", compress_type=zipfile.ZIP_BZIP2)
-        info = zipfp.getinfo('b.txt')
-        self.assertEqual(info.compress_type, zipfile.ZIP_BZIP2)
+        with zipfile.ZipFile(TESTFN2, "r") as zipfp:
+            infos = zipfp.infolist()
+            data = b""
+            for info in infos:
+                with zipfp.open(info) as zipopen:
+                    data += zipopen.read()
+            self.assertIn(data, {b"foobar", b"barfoo"})
+            data = b""
+            for info in infos:
+                data += zipfp.read(info)
+            self.assertIn(data, {b"foobar", b"barfoo"})
 
-    @requires_lzma
-    def test_writestr_compression_lzma(self):
-        zipfp = zipfile.ZipFile(TESTFN2, "w")
-        zipfp.writestr("b.txt", "hello world", compress_type=zipfile.ZIP_LZMA)
-        info = zipfp.getinfo('b.txt')
-        self.assertEqual(info.compress_type, zipfile.ZIP_LZMA)
+    def test_universal_readaheads(self):
+        f = io.BytesIO()
 
-    def zip_test_writestr_permissions(self, f, compression):
-        # Make sure that writestr creates files with mode 0600,
-        # when it is passed a name rather than a ZipInfo instance.
+        data = b'a\r\n' * 16 * 1024
+        with zipfile.ZipFile(f, 'w', zipfile.ZIP_STORED) as zipfp:
+            zipfp.writestr(TESTFN, data)
 
-        self.make_test_archive(f, compression)
-        with zipfile.ZipFile(f, "r") as zipfp:
-            zinfo = zipfp.getinfo('strfile')
-            self.assertEqual(zinfo.external_attr, 0o600 << 16)
-        if not isinstance(f, str):
-            f.close()
+        data2 = b''
+        with zipfile.ZipFile(f, 'r') as zipfp, \
+             zipfp.open(TESTFN, 'rU') as zipopen:
+            for line in zipopen:
+                data2 += line
 
-    def test_writestr_permissions(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_test_writestr_permissions(f, zipfile.ZIP_STORED)
+        self.assertEqual(data, data2.replace(b'\n', b'\r\n'))
 
     def test_writestr_extended_local_header_issue1202(self):
         with zipfile.ZipFile(TESTFN2, 'w') as orig_zip:
@@ -690,12 +815,12 @@
         with zipfile.ZipFile(TESTFN2, "w") as zipfp:
             for fpath, fdata in SMALL_TEST_DATA:
                 zipfp.writestr(fpath, fdata)
-                self.assertTrue(zipfp.fp is not None, 'zipfp is not open')
-        self.assertTrue(zipfp.fp is None, 'zipfp is not closed')
+                self.assertIsNotNone(zipfp.fp, 'zipfp is not open')
+        self.assertIsNone(zipfp.fp, 'zipfp is not closed')
 
         with zipfile.ZipFile(TESTFN2, "r") as zipfp:
-            self.assertTrue(zipfp.fp is not None, 'zipfp is not open')
-        self.assertTrue(zipfp.fp is None, 'zipfp is not closed')
+            self.assertIsNotNone(zipfp.fp, 'zipfp is not open')
+        self.assertIsNone(zipfp.fp, 'zipfp is not closed')
 
     def test_close_on_exception(self):
         """Check that the zipfile is closed if an exception is raised in the
@@ -708,317 +833,7 @@
             with zipfile.ZipFile(TESTFN2, "r") as zipfp2:
                 raise zipfile.BadZipFile()
         except zipfile.BadZipFile:
-            self.assertTrue(zipfp2.fp is None, 'zipfp is not closed')
-
-    def test_add_file_before_1980(self):
-        # Set atime and mtime to 1970-01-01
-        os.utime(TESTFN, (0, 0))
-        with zipfile.ZipFile(TESTFN2, "w") as zipfp:
-            self.assertRaises(ValueError, zipfp.write, TESTFN)
-
-
-
-
-
-
-
-    @requires_zlib
-    def test_unicode_filenames(self):
-        # bug #10801
-        fname = findfile('zip_cp437_header.zip')
-        with zipfile.ZipFile(fname) as zipfp:
-            for name in zipfp.namelist():
-                zipfp.open(name).close()
-
-    def tearDown(self):
-        unlink(TESTFN)
-        unlink(TESTFN2)
-
-
-class TestZip64InSmallFiles(unittest.TestCase):
-    # These tests test the ZIP64 functionality without using large files,
-    # see test_zipfile64 for proper tests.
-
-    def setUp(self):
-        self._limit = zipfile.ZIP64_LIMIT
-        zipfile.ZIP64_LIMIT = 5
-
-        line_gen = (bytes("Test of zipfile line %d." % i, "ascii")
-                    for i in range(0, FIXEDTEST_SIZE))
-        self.data = b'\n'.join(line_gen)
-
-        # Make a source file with some lines
-        with open(TESTFN, "wb") as fp:
-            fp.write(self.data)
-
-    def large_file_exception_test(self, f, compression):
-        with zipfile.ZipFile(f, "w", compression) as zipfp:
-            self.assertRaises(zipfile.LargeZipFile,
-                              zipfp.write, TESTFN, "another.name")
-
-    def large_file_exception_test2(self, f, compression):
-        with zipfile.ZipFile(f, "w", compression) as zipfp:
-            self.assertRaises(zipfile.LargeZipFile,
-                              zipfp.writestr, "another.name", self.data)
-        if not isinstance(f, str):
-            f.close()
-
-    def test_large_file_exception(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.large_file_exception_test(f, zipfile.ZIP_STORED)
-            self.large_file_exception_test2(f, zipfile.ZIP_STORED)
-
-    def zip_test(self, f, compression):
-        # Create the ZIP archive
-        with zipfile.ZipFile(f, "w", compression, allowZip64=True) as zipfp:
-            zipfp.write(TESTFN, "another.name")
-            zipfp.write(TESTFN, TESTFN)
-            zipfp.writestr("strfile", self.data)
-
-        # Read the ZIP archive
-        with zipfile.ZipFile(f, "r", compression) as zipfp:
-            self.assertEqual(zipfp.read(TESTFN), self.data)
-            self.assertEqual(zipfp.read("another.name"), self.data)
-            self.assertEqual(zipfp.read("strfile"), self.data)
-
-            # Print the ZIP directory
-            fp = io.StringIO()
-            zipfp.printdir(fp)
-
-            directory = fp.getvalue()
-            lines = directory.splitlines()
-            self.assertEqual(len(lines), 4) # Number of files + header
-
-            self.assertIn('File Name', lines[0])
-            self.assertIn('Modified', lines[0])
-            self.assertIn('Size', lines[0])
-
-            fn, date, time_, size = lines[1].split()
-            self.assertEqual(fn, 'another.name')
-            self.assertTrue(time.strptime(date, '%Y-%m-%d'))
-            self.assertTrue(time.strptime(time_, '%H:%M:%S'))
-            self.assertEqual(size, str(len(self.data)))
-
-            # Check the namelist
-            names = zipfp.namelist()
-            self.assertEqual(len(names), 3)
-            self.assertIn(TESTFN, names)
-            self.assertIn("another.name", names)
-            self.assertIn("strfile", names)
-
-            # Check infolist
-            infos = zipfp.infolist()
-            names = [i.filename for i in infos]
-            self.assertEqual(len(names), 3)
-            self.assertIn(TESTFN, names)
-            self.assertIn("another.name", names)
-            self.assertIn("strfile", names)
-            for i in infos:
-                self.assertEqual(i.file_size, len(self.data))
-
-            # check getinfo
-            for nm in (TESTFN, "another.name", "strfile"):
-                info = zipfp.getinfo(nm)
-                self.assertEqual(info.filename, nm)
-                self.assertEqual(info.file_size, len(self.data))
-
-            # Check that testzip doesn't raise an exception
-            zipfp.testzip()
-        if not isinstance(f, str):
-            f.close()
-
-    def test_stored(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_test(f, zipfile.ZIP_STORED)
-
-    @requires_zlib
-    def test_deflated(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_test(f, zipfile.ZIP_DEFLATED)
-
-    @requires_bz2
-    def test_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_test(f, zipfile.ZIP_BZIP2)
-
-    @requires_lzma
-    def test_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_test(f, zipfile.ZIP_LZMA)
-
-    def test_absolute_arcnames(self):
-        with zipfile.ZipFile(TESTFN2, "w", zipfile.ZIP_STORED,
-                             allowZip64=True) as zipfp:
-            zipfp.write(TESTFN, "/absolute")
-
-        with zipfile.ZipFile(TESTFN2, "r", zipfile.ZIP_STORED) as zipfp:
-            self.assertEqual(zipfp.namelist(), ["absolute"])
-
-    def tearDown(self):
-        zipfile.ZIP64_LIMIT = self._limit
-        unlink(TESTFN)
-        unlink(TESTFN2)
-
-
-class PyZipFileTests(unittest.TestCase):
-    def test_write_pyfile(self):
-        with TemporaryFile() as t, zipfile.PyZipFile(t, "w") as zipfp:
-            fn = __file__
-            if fn.endswith('.pyc') or fn.endswith('.pyo'):
-                path_split = fn.split(os.sep)
-                if os.altsep is not None:
-                    path_split.extend(fn.split(os.altsep))
-                if '__pycache__' in path_split:
-                    fn = importlib.util.source_from_cache(fn)
-                else:
-                    fn = fn[:-1]
-
-            zipfp.writepy(fn)
-
-            bn = os.path.basename(fn)
-            self.assertNotIn(bn, zipfp.namelist())
-            self.assertTrue(bn + 'o' in zipfp.namelist() or
-                            bn + 'c' in zipfp.namelist())
-
-        with TemporaryFile() as t, zipfile.PyZipFile(t, "w") as zipfp:
-            fn = __file__
-            if fn.endswith(('.pyc', '.pyo')):
-                fn = fn[:-1]
-
-            zipfp.writepy(fn, "testpackage")
-
-            bn = "%s/%s" % ("testpackage", os.path.basename(fn))
-            self.assertNotIn(bn, zipfp.namelist())
-            self.assertTrue(bn + 'o' in zipfp.namelist() or
-                            bn + 'c' in zipfp.namelist())
-
-    def test_write_python_package(self):
-        import email
-        packagedir = os.path.dirname(email.__file__)
-
-        with TemporaryFile() as t, zipfile.PyZipFile(t, "w") as zipfp:
-            zipfp.writepy(packagedir)
-
-            # Check for a couple of modules at different levels of the
-            # hierarchy
-            names = zipfp.namelist()
-            self.assertTrue('email/__init__.pyo' in names or
-                            'email/__init__.pyc' in names)
-            self.assertTrue('email/mime/text.pyo' in names or
-                            'email/mime/text.pyc' in names)
-
-    def test_write_with_optimization(self):
-        import email
-        packagedir = os.path.dirname(email.__file__)
-        # use .pyc if running test in optimization mode,
-        # use .pyo if running test in debug mode
-        optlevel = 1 if __debug__ else 0
-        ext = '.pyo' if optlevel == 1 else '.pyc'
-
-        with TemporaryFile() as t, \
-                 zipfile.PyZipFile(t, "w", optimize=optlevel) as zipfp:
-            zipfp.writepy(packagedir)
-
-            names = zipfp.namelist()
-            self.assertIn('email/__init__' + ext, names)
-            self.assertIn('email/mime/text' + ext, names)
-
-    def test_write_python_directory(self):
-        os.mkdir(TESTFN2)
-        try:
-            with open(os.path.join(TESTFN2, "mod1.py"), "w") as fp:
-                fp.write("print(42)\n")
-
-            with open(os.path.join(TESTFN2, "mod2.py"), "w") as fp:
-                fp.write("print(42 * 42)\n")
-
-            with open(os.path.join(TESTFN2, "mod2.txt"), "w") as fp:
-                fp.write("bla bla bla\n")
-
-            with TemporaryFile() as t, zipfile.PyZipFile(t, "w") as zipfp:
-                zipfp.writepy(TESTFN2)
-
-                names = zipfp.namelist()
-                self.assertTrue('mod1.pyc' in names or 'mod1.pyo' in names)
-                self.assertTrue('mod2.pyc' in names or 'mod2.pyo' in names)
-                self.assertNotIn('mod2.txt', names)
-
-        finally:
-            shutil.rmtree(TESTFN2)
-
-    def test_write_non_pyfile(self):
-        with TemporaryFile() as t, zipfile.PyZipFile(t, "w") as zipfp:
-            with open(TESTFN, 'w') as f:
-                f.write('most definitely not a python file')
-            self.assertRaises(RuntimeError, zipfp.writepy, TESTFN)
-            os.remove(TESTFN)
-
-    def test_write_pyfile_bad_syntax(self):
-        os.mkdir(TESTFN2)
-        try:
-            with open(os.path.join(TESTFN2, "mod1.py"), "w") as fp:
-                fp.write("Bad syntax in python file\n")
-
-            with TemporaryFile() as t, zipfile.PyZipFile(t, "w") as zipfp:
-                # syntax errors are printed to stdout
-                with captured_stdout() as s:
-                    zipfp.writepy(os.path.join(TESTFN2, "mod1.py"))
-
-                self.assertIn("SyntaxError", s.getvalue())
-
-                # as it will not have compiled the python file, it will
-                # include the .py file not .pyc or .pyo
-                names = zipfp.namelist()
-                self.assertIn('mod1.py', names)
-                self.assertNotIn('mod1.pyc', names)
-                self.assertNotIn('mod1.pyo', names)
-
-        finally:
-            shutil.rmtree(TESTFN2)
-
-class OtherTests(unittest.TestCase):
-    zips_with_bad_crc = {
-        zipfile.ZIP_STORED: (
-            b'PK\003\004\024\0\0\0\0\0 \213\212;:r'
-            b'\253\377\f\0\0\0\f\0\0\0\005\0\0\000af'
-            b'ilehello,AworldP'
-            b'K\001\002\024\003\024\0\0\0\0\0 \213\212;:'
-            b'r\253\377\f\0\0\0\f\0\0\0\005\0\0\0\0'
-            b'\0\0\0\0\0\0\0\200\001\0\0\0\000afi'
-            b'lePK\005\006\0\0\0\0\001\0\001\0003\000'
-            b'\0\0/\0\0\0\0\0'),
-        zipfile.ZIP_DEFLATED: (
-            b'PK\x03\x04\x14\x00\x00\x00\x08\x00n}\x0c=FA'
-            b'KE\x10\x00\x00\x00n\x00\x00\x00\x05\x00\x00\x00af'
-            b'ile\xcbH\xcd\xc9\xc9W(\xcf/\xcaI\xc9\xa0'
-            b'=\x13\x00PK\x01\x02\x14\x03\x14\x00\x00\x00\x08\x00n'
-            b'}\x0c=FAKE\x10\x00\x00\x00n\x00\x00\x00\x05'
-            b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x01\x00\x00\x00'
-            b'\x00afilePK\x05\x06\x00\x00\x00\x00\x01\x00'
-            b'\x01\x003\x00\x00\x003\x00\x00\x00\x00\x00'),
-        zipfile.ZIP_BZIP2: (
-            b'PK\x03\x04\x14\x03\x00\x00\x0c\x00nu\x0c=FA'
-            b'KE8\x00\x00\x00n\x00\x00\x00\x05\x00\x00\x00af'
-            b'ileBZh91AY&SY\xd4\xa8\xca'
-            b'\x7f\x00\x00\x0f\x11\x80@\x00\x06D\x90\x80 \x00 \xa5'
-            b'P\xd9!\x03\x03\x13\x13\x13\x89\xa9\xa9\xc2u5:\x9f'
-            b'\x8b\xb9"\x9c(HjTe?\x80PK\x01\x02\x14'
-            b'\x03\x14\x03\x00\x00\x0c\x00nu\x0c=FAKE8'
-            b'\x00\x00\x00n\x00\x00\x00\x05\x00\x00\x00\x00\x00\x00\x00\x00'
-            b'\x00 \x80\x80\x81\x00\x00\x00\x00afilePK'
-            b'\x05\x06\x00\x00\x00\x00\x01\x00\x01\x003\x00\x00\x00[\x00'
-            b'\x00\x00\x00\x00'),
-        zipfile.ZIP_LZMA: (
-            b'PK\x03\x04\x14\x03\x00\x00\x0e\x00nu\x0c=FA'
-            b'KE\x1b\x00\x00\x00n\x00\x00\x00\x05\x00\x00\x00af'
-            b'ile\t\x04\x05\x00]\x00\x00\x00\x04\x004\x19I'
-            b'\xee\x8d\xe9\x17\x89:3`\tq!.8\x00PK'
-            b'\x01\x02\x14\x03\x14\x03\x00\x00\x0e\x00nu\x0c=FA'
-            b'KE\x1b\x00\x00\x00n\x00\x00\x00\x05\x00\x00\x00\x00\x00'
-            b'\x00\x00\x00\x00 \x80\x80\x81\x00\x00\x00\x00afil'
-            b'ePK\x05\x06\x00\x00\x00\x00\x01\x00\x01\x003\x00\x00'
-            b'\x00>\x00\x00\x00\x00\x00'),
-    }
+            self.assertIsNone(zipfp2.fp, 'zipfp is not closed')
 
     def test_unsupported_version(self):
         # File has an extract_version of 120
@@ -1027,10 +842,19 @@
         b'\x00!p\xa1@\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00'
         b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x01\x00\x00\x00\x00xPK\x05\x06'
         b'\x00\x00\x00\x00\x01\x00\x01\x00/\x00\x00\x00\x1f\x00\x00\x00\x00\x00')
+
         self.assertRaises(NotImplementedError, zipfile.ZipFile,
                           io.BytesIO(data), 'r')
 
-    def test_unicode_filenames(self):
+    @requires_zlib
+    def test_read_unicode_filenames(self):
+        # bug #10801
+        fname = findfile('zip_cp437_header.zip')
+        with zipfile.ZipFile(fname) as zipfp:
+            for name in zipfp.namelist():
+                zipfp.open(name).close()
+
+    def test_write_unicode_filenames(self):
         with zipfile.ZipFile(TESTFN, "w") as zf:
             zf.writestr("foo.txt", "Test for unicode filename")
             zf.writestr("\xf6.txt", "Test for unicode filename")
@@ -1078,20 +902,16 @@
         # - passing a filename
         with open(TESTFN, "w") as fp:
             fp.write("this is not a legal zip file\n")
-        chk = zipfile.is_zipfile(TESTFN)
-        self.assertFalse(chk)
+        self.assertFalse(zipfile.is_zipfile(TESTFN))
         # - passing a file object
         with open(TESTFN, "rb") as fp:
-            chk = zipfile.is_zipfile(fp)
-            self.assertTrue(not chk)
+            self.assertFalse(zipfile.is_zipfile(fp))
         # - passing a file-like object
         fp = io.BytesIO()
         fp.write(b"this is not a legal zip file\n")
-        chk = zipfile.is_zipfile(fp)
-        self.assertTrue(not chk)
+        self.assertFalse(zipfile.is_zipfile(fp))
         fp.seek(0, 0)
-        chk = zipfile.is_zipfile(fp)
-        self.assertTrue(not chk)
+        self.assertFalse(zipfile.is_zipfile(fp))
 
     def test_damaged_zipfile(self):
         """Check that zipfiles with missing bytes at the end raise BadZipFile."""
@@ -1113,22 +933,18 @@
         with zipfile.ZipFile(TESTFN, mode="w") as zipf:
             zipf.writestr("foo.txt", b"O, for a Muse of Fire!")
 
-        chk = zipfile.is_zipfile(TESTFN)
-        self.assertTrue(chk)
+        self.assertTrue(zipfile.is_zipfile(TESTFN))
         # - passing a file object
         with open(TESTFN, "rb") as fp:
-            chk = zipfile.is_zipfile(fp)
-            self.assertTrue(chk)
+            self.assertTrue(zipfile.is_zipfile(fp))
             fp.seek(0, 0)
             zip_contents = fp.read()
         # - passing a file-like object
         fp = io.BytesIO()
         fp.write(zip_contents)
-        chk = zipfile.is_zipfile(fp)
-        self.assertTrue(chk)
+        self.assertTrue(zipfile.is_zipfile(fp))
         fp.seek(0, 0)
-        chk = zipfile.is_zipfile(fp)
-        self.assertTrue(chk)
+        self.assertTrue(zipfile.is_zipfile(fp))
 
     def test_non_existent_file_raises_OSError(self):
         # make sure we don't raise an AttributeError when a partially-constructed
@@ -1309,93 +1125,6 @@
         with zipfile.ZipFile(TESTFN, "r") as zipf:
             self.assertEqual(zipf.comment, b"this is a comment")
 
-    def check_testzip_with_bad_crc(self, compression):
-        """Tests that files with bad CRCs return their name from testzip."""
-        zipdata = self.zips_with_bad_crc[compression]
-
-        with zipfile.ZipFile(io.BytesIO(zipdata), mode="r") as zipf:
-            # testzip returns the name of the first corrupt file, or None
-            self.assertEqual('afile', zipf.testzip())
-
-    def test_testzip_with_bad_crc_stored(self):
-        self.check_testzip_with_bad_crc(zipfile.ZIP_STORED)
-
-    @requires_zlib
-    def test_testzip_with_bad_crc_deflated(self):
-        self.check_testzip_with_bad_crc(zipfile.ZIP_DEFLATED)
-
-    @requires_bz2
-    def test_testzip_with_bad_crc_bzip2(self):
-        self.check_testzip_with_bad_crc(zipfile.ZIP_BZIP2)
-
-    @requires_lzma
-    def test_testzip_with_bad_crc_lzma(self):
-        self.check_testzip_with_bad_crc(zipfile.ZIP_LZMA)
-
-    def check_read_with_bad_crc(self, compression):
-        """Tests that files with bad CRCs raise a BadZipFile exception when read."""
-        zipdata = self.zips_with_bad_crc[compression]
-
-        # Using ZipFile.read()
-        with zipfile.ZipFile(io.BytesIO(zipdata), mode="r") as zipf:
-            self.assertRaises(zipfile.BadZipFile, zipf.read, 'afile')
-
-        # Using ZipExtFile.read()
-        with zipfile.ZipFile(io.BytesIO(zipdata), mode="r") as zipf:
-            with zipf.open('afile', 'r') as corrupt_file:
-                self.assertRaises(zipfile.BadZipFile, corrupt_file.read)
-
-        # Same with small reads (in order to exercise the buffering logic)
-        with zipfile.ZipFile(io.BytesIO(zipdata), mode="r") as zipf:
-            with zipf.open('afile', 'r') as corrupt_file:
-                corrupt_file.MIN_READ_SIZE = 2
-                with self.assertRaises(zipfile.BadZipFile):
-                    while corrupt_file.read(2):
-                        pass
-
-    def test_read_with_bad_crc_stored(self):
-        self.check_read_with_bad_crc(zipfile.ZIP_STORED)
-
-    @requires_zlib
-    def test_read_with_bad_crc_deflated(self):
-        self.check_read_with_bad_crc(zipfile.ZIP_DEFLATED)
-
-    @requires_bz2
-    def test_read_with_bad_crc_bzip2(self):
-        self.check_read_with_bad_crc(zipfile.ZIP_BZIP2)
-
-    @requires_lzma
-    def test_read_with_bad_crc_lzma(self):
-        self.check_read_with_bad_crc(zipfile.ZIP_LZMA)
-
-    def check_read_return_size(self, compression):
-        # Issue #9837: ZipExtFile.read() shouldn't return more bytes
-        # than requested.
-        for test_size in (1, 4095, 4096, 4097, 16384):
-            file_size = test_size + 1
-            junk = b''.join(struct.pack('B', randint(0, 255))
-                            for x in range(file_size))
-            with zipfile.ZipFile(io.BytesIO(), "w", compression) as zipf:
-                zipf.writestr('foo', junk)
-                with zipf.open('foo', 'r') as fp:
-                    buf = fp.read(test_size)
-                    self.assertEqual(len(buf), test_size)
-
-    def test_read_return_size_stored(self):
-        self.check_read_return_size(zipfile.ZIP_STORED)
-
-    @requires_zlib
-    def test_read_return_size_deflated(self):
-        self.check_read_return_size(zipfile.ZIP_DEFLATED)
-
-    @requires_bz2
-    def test_read_return_size_bzip2(self):
-        self.check_read_return_size(zipfile.ZIP_BZIP2)
-
-    @requires_lzma
-    def test_read_return_size_lzma(self):
-        self.check_read_return_size(zipfile.ZIP_LZMA)
-
     def test_empty_zipfile(self):
         # Check that creating a file in 'w' or 'a' mode and closing without
         # adding any files to the archives creates a valid empty ZIP file
@@ -1430,6 +1159,93 @@
         unlink(TESTFN2)
 
 
+class AbstractBadCrcTests:
+    def test_testzip_with_bad_crc(self):
+        """Tests that files with bad CRCs return their name from testzip."""
+        zipdata = self.zip_with_bad_crc
+
+        with zipfile.ZipFile(io.BytesIO(zipdata), mode="r") as zipf:
+            # testzip returns the name of the first corrupt file, or None
+            self.assertEqual('afile', zipf.testzip())
+
+    def test_read_with_bad_crc(self):
+        """Tests that files with bad CRCs raise a BadZipFile exception when read."""
+        zipdata = self.zip_with_bad_crc
+
+        # Using ZipFile.read()
+        with zipfile.ZipFile(io.BytesIO(zipdata), mode="r") as zipf:
+            self.assertRaises(zipfile.BadZipFile, zipf.read, 'afile')
+
+        # Using ZipExtFile.read()
+        with zipfile.ZipFile(io.BytesIO(zipdata), mode="r") as zipf:
+            with zipf.open('afile', 'r') as corrupt_file:
+                self.assertRaises(zipfile.BadZipFile, corrupt_file.read)
+
+        # Same with small reads (in order to exercise the buffering logic)
+        with zipfile.ZipFile(io.BytesIO(zipdata), mode="r") as zipf:
+            with zipf.open('afile', 'r') as corrupt_file:
+                corrupt_file.MIN_READ_SIZE = 2
+                with self.assertRaises(zipfile.BadZipFile):
+                    while corrupt_file.read(2):
+                        pass
+
+
+class StoredBadCrcTests(AbstractBadCrcTests, unittest.TestCase):
+    compression = zipfile.ZIP_STORED
+    zip_with_bad_crc = (
+            b'PK\003\004\024\0\0\0\0\0 \213\212;:r'
+            b'\253\377\f\0\0\0\f\0\0\0\005\0\0\000af'
+            b'ilehello,AworldP'
+            b'K\001\002\024\003\024\0\0\0\0\0 \213\212;:'
+            b'r\253\377\f\0\0\0\f\0\0\0\005\0\0\0\0'
+            b'\0\0\0\0\0\0\0\200\001\0\0\0\000afi'
+            b'lePK\005\006\0\0\0\0\001\0\001\0003\000'
+            b'\0\0/\0\0\0\0\0')
+
+@requires_zlib
+class DeflateBadCrcTests(AbstractBadCrcTests, unittest.TestCase):
+    compression = zipfile.ZIP_DEFLATED
+    zip_with_bad_crc = (
+            b'PK\x03\x04\x14\x00\x00\x00\x08\x00n}\x0c=FA'
+            b'KE\x10\x00\x00\x00n\x00\x00\x00\x05\x00\x00\x00af'
+            b'ile\xcbH\xcd\xc9\xc9W(\xcf/\xcaI\xc9\xa0'
+            b'=\x13\x00PK\x01\x02\x14\x03\x14\x00\x00\x00\x08\x00n'
+            b'}\x0c=FAKE\x10\x00\x00\x00n\x00\x00\x00\x05'
+            b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x01\x00\x00\x00'
+            b'\x00afilePK\x05\x06\x00\x00\x00\x00\x01\x00'
+            b'\x01\x003\x00\x00\x003\x00\x00\x00\x00\x00')
+
+@requires_bz2
+class Bzip2BadCrcTests(AbstractBadCrcTests, unittest.TestCase):
+    compression = zipfile.ZIP_BZIP2
+    zip_with_bad_crc = (
+            b'PK\x03\x04\x14\x03\x00\x00\x0c\x00nu\x0c=FA'
+            b'KE8\x00\x00\x00n\x00\x00\x00\x05\x00\x00\x00af'
+            b'ileBZh91AY&SY\xd4\xa8\xca'
+            b'\x7f\x00\x00\x0f\x11\x80@\x00\x06D\x90\x80 \x00 \xa5'
+            b'P\xd9!\x03\x03\x13\x13\x13\x89\xa9\xa9\xc2u5:\x9f'
+            b'\x8b\xb9"\x9c(HjTe?\x80PK\x01\x02\x14'
+            b'\x03\x14\x03\x00\x00\x0c\x00nu\x0c=FAKE8'
+            b'\x00\x00\x00n\x00\x00\x00\x05\x00\x00\x00\x00\x00\x00\x00\x00'
+            b'\x00 \x80\x80\x81\x00\x00\x00\x00afilePK'
+            b'\x05\x06\x00\x00\x00\x00\x01\x00\x01\x003\x00\x00\x00[\x00'
+            b'\x00\x00\x00\x00')
+
+@requires_lzma
+class LzmaBadCrcTests(AbstractBadCrcTests, unittest.TestCase):
+    compression = zipfile.ZIP_LZMA
+    zip_with_bad_crc = (
+            b'PK\x03\x04\x14\x03\x00\x00\x0e\x00nu\x0c=FA'
+            b'KE\x1b\x00\x00\x00n\x00\x00\x00\x05\x00\x00\x00af'
+            b'ile\t\x04\x05\x00]\x00\x00\x00\x04\x004\x19I'
+            b'\xee\x8d\xe9\x17\x89:3`\tq!.8\x00PK'
+            b'\x01\x02\x14\x03\x14\x03\x00\x00\x0e\x00nu\x0c=FA'
+            b'KE\x1b\x00\x00\x00n\x00\x00\x00\x05\x00\x00\x00\x00\x00'
+            b'\x00\x00\x00\x00 \x80\x80\x81\x00\x00\x00\x00afil'
+            b'ePK\x05\x06\x00\x00\x00\x00\x01\x00\x01\x003\x00\x00'
+            b'\x00>\x00\x00\x00\x00\x00')
+
+
 class DecryptionTests(unittest.TestCase):
     """Check that ZIP decryption works. Since the library does not
     support encryption at the moment, we use a pre-generated encrypted
@@ -1495,13 +1311,14 @@
         self.assertRaises(TypeError, self.zip.open, "test.txt", pwd="python")
         self.assertRaises(TypeError, self.zip.extract, "test.txt", pwd="python")
 
-
-class TestsWithRandomBinaryFiles(unittest.TestCase):
-    def setUp(self):
+class AbstractTestsWithRandomBinaryFiles:
+    @classmethod
+    def setUpClass(cls):
         datacount = randint(16, 64)*1024 + randint(1, 1024)
-        self.data = b''.join(struct.pack('<f', random()*randint(-1000, 1000))
-                             for i in range(datacount))
+        cls.data = b''.join(struct.pack('<f', random()*randint(-1000, 1000))
+                            for i in range(datacount))
 
+    def setUp(self):
         # Make a source file with some lines
         with open(TESTFN, "wb") as fp:
             fp.write(self.data)
@@ -1525,27 +1342,10 @@
             self.assertEqual(len(testdata), len(self.data))
             self.assertEqual(testdata, self.data)
             self.assertEqual(zipfp.read("another.name"), self.data)
-        if not isinstance(f, str):
-            f.close()
 
-    def test_stored(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_test(f, zipfile.ZIP_STORED)
-
-    @requires_zlib
-    def test_deflated(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_test(f, zipfile.ZIP_DEFLATED)
-
-    @requires_bz2
-    def test_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_test(f, zipfile.ZIP_BZIP2)
-
-    @requires_lzma
-    def test_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_test(f, zipfile.ZIP_LZMA)
+    def test_read(self):
+        for f in get_files(self):
+            self.zip_test(f, self.compression)
 
     def zip_open_test(self, f, compression):
         self.make_test_archive(f, compression)
@@ -1575,27 +1375,10 @@
             testdata2 = b''.join(zipdata2)
             self.assertEqual(len(testdata2), len(self.data))
             self.assertEqual(testdata2, self.data)
-        if not isinstance(f, str):
-            f.close()
 
-    def test_open_stored(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_open_test(f, zipfile.ZIP_STORED)
-
-    @requires_zlib
-    def test_open_deflated(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_open_test(f, zipfile.ZIP_DEFLATED)
-
-    @requires_bz2
-    def test_open_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_open_test(f, zipfile.ZIP_BZIP2)
-
-    @requires_lzma
-    def test_open_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_open_test(f, zipfile.ZIP_LZMA)
+    def test_open(self):
+        for f in get_files(self):
+            self.zip_open_test(f, self.compression)
 
     def zip_random_open_test(self, f, compression):
         self.make_test_archive(f, compression)
@@ -1613,27 +1396,30 @@
             testdata = b''.join(zipdata1)
             self.assertEqual(len(testdata), len(self.data))
             self.assertEqual(testdata, self.data)
-        if not isinstance(f, str):
-            f.close()
 
-    def test_random_open_stored(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_random_open_test(f, zipfile.ZIP_STORED)
+    def test_random_open(self):
+        for f in get_files(self):
+            self.zip_random_open_test(f, self.compression)
 
-    @requires_zlib
-    def test_random_open_deflated(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_random_open_test(f, zipfile.ZIP_DEFLATED)
 
-    @requires_bz2
-    def test_random_open_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_random_open_test(f, zipfile.ZIP_BZIP2)
+class StoredTestsWithRandomBinaryFiles(AbstractTestsWithRandomBinaryFiles,
+                                       unittest.TestCase):
+    compression = zipfile.ZIP_STORED
 
-    @requires_lzma
-    def test_random_open_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.zip_random_open_test(f, zipfile.ZIP_LZMA)
+@requires_zlib
+class DeflateTestsWithRandomBinaryFiles(AbstractTestsWithRandomBinaryFiles,
+                                        unittest.TestCase):
+    compression = zipfile.ZIP_DEFLATED
+
+@requires_bz2
+class Bzip2TestsWithRandomBinaryFiles(AbstractTestsWithRandomBinaryFiles,
+                                      unittest.TestCase):
+    compression = zipfile.ZIP_BZIP2
+
+@requires_lzma
+class LzmaTestsWithRandomBinaryFiles(AbstractTestsWithRandomBinaryFiles,
+                                     unittest.TestCase):
+    compression = zipfile.ZIP_LZMA
 
 
 @requires_zlib
@@ -1711,21 +1497,22 @@
             unlink(TESTFN)
 
 
-class UniversalNewlineTests(unittest.TestCase):
+class AbstractUniversalNewlineTests:
+    @classmethod
+    def setUpClass(cls):
+        cls.line_gen = [bytes("Test of zipfile line %d." % i, "ascii")
+                        for i in range(FIXEDTEST_SIZE)]
+        cls.seps = (b'\r', b'\r\n', b'\n')
+        cls.arcdata = {}
+        for n, s in enumerate(cls.seps):
+            cls.arcdata[s] = s.join(cls.line_gen) + s
+
     def setUp(self):
-        self.line_gen = [bytes("Test of zipfile line %d." % i, "ascii")
-                         for i in range(FIXEDTEST_SIZE)]
-        self.seps = ('\r', '\r\n', '\n')
-        self.arcdata, self.arcfiles = {}, {}
+        self.arcfiles = {}
         for n, s in enumerate(self.seps):
-            b = s.encode("ascii")
-            self.arcdata[s] = b.join(self.line_gen) + b
             self.arcfiles[s] = '%s-%d' % (TESTFN, n)
-            f = open(self.arcfiles[s], "wb")
-            try:
+            with open(self.arcfiles[s], "wb") as f:
                 f.write(self.arcdata[s])
-            finally:
-                f.close()
 
     def make_test_archive(self, f, compression):
         # Create the ZIP archive
@@ -1742,8 +1529,10 @@
                 with zipfp.open(fn, "rU") as fp:
                     zipdata = fp.read()
                 self.assertEqual(self.arcdata[sep], zipdata)
-        if not isinstance(f, str):
-            f.close()
+
+    def test_read(self):
+        for f in get_files(self):
+            self.read_test(f, self.compression)
 
     def readline_read_test(self, f, compression):
         self.make_test_archive(f, compression)
@@ -1764,10 +1553,11 @@
                             break
                         data += read
 
-            self.assertEqual(data, self.arcdata['\n'])
+            self.assertEqual(data, self.arcdata[b'\n'])
 
-        if not isinstance(f, str):
-            f.close()
+    def test_readline_read(self):
+        for f in get_files(self):
+            self.readline_read_test(f, self.compression)
 
     def readline_test(self, f, compression):
         self.make_test_archive(f, compression)
@@ -1779,8 +1569,10 @@
                     for line in self.line_gen:
                         linedata = zipopen.readline()
                         self.assertEqual(linedata, line + b'\n')
-        if not isinstance(f, str):
-            f.close()
+
+    def test_readline(self):
+        for f in get_files(self):
+            self.readline_test(f, self.compression)
 
     def readlines_test(self, f, compression):
         self.make_test_archive(f, compression)
@@ -1792,8 +1584,10 @@
                     ziplines = fp.readlines()
                 for line, zipline in zip(self.line_gen, ziplines):
                     self.assertEqual(zipline, line + b'\n')
-        if not isinstance(f, str):
-            f.close()
+
+    def test_readlines(self):
+        for f in get_files(self):
+            self.readlines_test(f, self.compression)
 
     def iterlines_test(self, f, compression):
         self.make_test_archive(f, compression)
@@ -1804,105 +1598,10 @@
                 with zipfp.open(fn, "rU") as fp:
                     for line, zipline in zip(self.line_gen, fp):
                         self.assertEqual(zipline, line + b'\n')
-        if not isinstance(f, str):
-            f.close()
 
-    def test_read_stored(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.read_test(f, zipfile.ZIP_STORED)
-
-    def test_readline_read_stored(self):
-        # Issue #7610: calls to readline() interleaved with calls to read().
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.readline_read_test(f, zipfile.ZIP_STORED)
-
-    def test_readline_stored(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.readline_test(f, zipfile.ZIP_STORED)
-
-    def test_readlines_stored(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.readlines_test(f, zipfile.ZIP_STORED)
-
-    def test_iterlines_stored(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.iterlines_test(f, zipfile.ZIP_STORED)
-
-    @requires_zlib
-    def test_read_deflated(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.read_test(f, zipfile.ZIP_DEFLATED)
-
-    @requires_zlib
-    def test_readline_read_deflated(self):
-        # Issue #7610: calls to readline() interleaved with calls to read().
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.readline_read_test(f, zipfile.ZIP_DEFLATED)
-
-    @requires_zlib
-    def test_readline_deflated(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.readline_test(f, zipfile.ZIP_DEFLATED)
-
-    @requires_zlib
-    def test_readlines_deflated(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.readlines_test(f, zipfile.ZIP_DEFLATED)
-
-    @requires_zlib
-    def test_iterlines_deflated(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.iterlines_test(f, zipfile.ZIP_DEFLATED)
-
-    @requires_bz2
-    def test_read_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.read_test(f, zipfile.ZIP_BZIP2)
-
-    @requires_bz2
-    def test_readline_read_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.readline_read_test(f, zipfile.ZIP_BZIP2)
-
-    @requires_bz2
-    def test_readline_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.readline_test(f, zipfile.ZIP_BZIP2)
-
-    @requires_bz2
-    def test_readlines_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.readlines_test(f, zipfile.ZIP_BZIP2)
-
-    @requires_bz2
-    def test_iterlines_bzip2(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.iterlines_test(f, zipfile.ZIP_BZIP2)
-
-    @requires_lzma
-    def test_read_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.read_test(f, zipfile.ZIP_LZMA)
-
-    @requires_lzma
-    def test_readline_read_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.readline_read_test(f, zipfile.ZIP_LZMA)
-
-    @requires_lzma
-    def test_readline_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.readline_test(f, zipfile.ZIP_LZMA)
-
-    @requires_lzma
-    def test_readlines_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.readlines_test(f, zipfile.ZIP_LZMA)
-
-    @requires_lzma
-    def test_iterlines_lzma(self):
-        for f in (TESTFN2, TemporaryFile(), io.BytesIO()):
-            self.iterlines_test(f, zipfile.ZIP_LZMA)
+    def test_iterlines(self):
+        for f in get_files(self):
+            self.iterlines_test(f, self.compression)
 
     def tearDown(self):
         for sep, fn in self.arcfiles.items():
@@ -1911,5 +1610,24 @@
         unlink(TESTFN2)
 
 
+class StoredUniversalNewlineTests(AbstractUniversalNewlineTests,
+                                  unittest.TestCase):
+    compression = zipfile.ZIP_STORED
+
+@requires_zlib
+class DeflateUniversalNewlineTests(AbstractUniversalNewlineTests,
+                                   unittest.TestCase):
+    compression = zipfile.ZIP_DEFLATED
+
+@requires_bz2
+class Bzip2UniversalNewlineTests(AbstractUniversalNewlineTests,
+                                 unittest.TestCase):
+    compression = zipfile.ZIP_BZIP2
+
+@requires_lzma
+class LzmaUniversalNewlineTests(AbstractUniversalNewlineTests,
+                                unittest.TestCase):
+    compression = zipfile.ZIP_LZMA
+
 if __name__ == "__main__":
     unittest.main()
diff --git a/Misc/NEWS b/Misc/NEWS
index 3391d2c..2d970b9 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -548,6 +548,10 @@
 Tests
 -----
 
+- Issue #17944: test_zipfile now discoverable and uses subclassing to
+  generate tests for different compression types.  Fixed a bug with skipping
+  some tests due to use of exhausted iterators.
+
 - Issue #18266: test_largefile now works with unittest test discovery and
   supports running only selected tests.  Patch by Zachary Ware.