SF patch #440170: Tests for fileinput module.
New test_fileinput.py from Nick Mathewson, fiddled to use TESTFN and sundry
style nits.
diff --git a/Lib/test/test_fileinput.py b/Lib/test/test_fileinput.py
new file mode 100644
index 0000000..fe90860
--- /dev/null
+++ b/Lib/test/test_fileinput.py
@@ -0,0 +1,159 @@
+'''
+Tests for fileinput module.
+Nick Mathewson
+'''
+
+from test_support import verify, verbose, TESTFN
+import sys, os, re
+from StringIO import StringIO
+from fileinput import FileInput
+
+# The fileinput module has 2 interfaces: the FileInput class which does
+# all the work, and a few functions (input, etc.) that use a global _state
+# variable. We only test the FileInput class, since the other functions
+# only provide a thin facade over FileInput.
+
+# Write lines (a list of lines) to temp file number i, and return the
+# temp file's name.
+def writeTmp(i, lines):
+ name = TESTFN + str(i)
+ f = open(name, 'w')
+ f.writelines(lines)
+ f.close()
+ return name
+
+pat = re.compile(r'LINE (\d+) OF FILE (\d+)')
+
+def remove_tempfiles(*names):
+ for name in names:
+ try:
+ os.unlink(name)
+ except:
+ pass
+
+def runTests(t1, t2, t3, t4, bs=0, round=0):
+ start = 1 + round*6
+ if verbose:
+ print '%s. Simple iteration (bs=%s)' % (start+0, bs)
+ fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
+ lines = list(fi)
+ fi.close()
+ verify(len(lines) == 31)
+ verify(lines[4] == 'Line 5 of file 1\n')
+ verify(lines[30] == 'Line 1 of file 4\n')
+ verify(fi.lineno() == 31)
+ verify(fi.filename() == t4)
+
+ if verbose:
+ print '%s. Status variables (bs=%s)' % (start+1, bs)
+ fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
+ s = "x"
+ while s and s != 'Line 6 of file 2\n':
+ s = fi.readline()
+ verify(fi.filename() == t2)
+ verify(fi.lineno() == 21)
+ verify(fi.filelineno() == 6)
+ verify(not fi.isfirstline())
+ verify(not fi.isstdin())
+
+ if verbose:
+ print '%s. Nextfile (bs=%s)' % (start+2, bs)
+ fi.nextfile()
+ verify(fi.readline() == 'Line 1 of file 3\n')
+ verify(fi.lineno() == 22)
+ fi.close()
+
+ if verbose:
+ print '%s. Stdin (bs=%s)' % (start+3, bs)
+ fi = FileInput(files=(t1, t2, t3, t4, '-'), bufsize=bs)
+ savestdin = sys.stdin
+ try:
+ sys.stdin = StringIO("Line 1 of stdin\nLine 2 of stdin\n")
+ lines = list(fi)
+ verify(len(lines) == 33)
+ verify(lines[32] == 'Line 2 of stdin\n')
+ verify(fi.filename() == '<stdin>')
+ fi.nextfile()
+ finally:
+ sys.stdin = savestdin
+
+ if verbose:
+ print '%s. Boundary conditions (bs=%s)' % (start+4, bs)
+ fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
+ verify(fi.lineno() == 0)
+ verify(fi.filename() == None)
+ fi.nextfile()
+ verify(fi.lineno() == 0)
+ verify(fi.filename() == None)
+
+ if verbose:
+ print '%s. Inplace (bs=%s)' % (start+5, bs)
+ savestdout = sys.stdout
+ try:
+ fi = FileInput(files=(t1, t2, t3, t4), inplace=1, bufsize=bs)
+ for line in fi:
+ line = line[:-1].upper()
+ print line
+ fi.close()
+ finally:
+ sys.stdout = savestdout
+
+ fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
+ for line in fi:
+ verify(line[-1] == '\n')
+ m = pat.match(line[:-1])
+ verify(m != None)
+ verify(int(m.group(1)) == fi.filelineno())
+ fi.close()
+
+
+def writeFiles():
+ global t1, t2, t3, t4
+ t1 = writeTmp(1, ["Line %s of file 1\n" % (i+1) for i in range(15)])
+ t2 = writeTmp(2, ["Line %s of file 2\n" % (i+1) for i in range(10)])
+ t3 = writeTmp(3, ["Line %s of file 3\n" % (i+1) for i in range(5)])
+ t4 = writeTmp(4, ["Line %s of file 4\n" % (i+1) for i in range(1)])
+
+# First, run the tests with default and teeny buffer size.
+for round, bs in (0, 0), (1, 30):
+ try:
+ writeFiles()
+ runTests(t1, t2, t3, t4, bs, round)
+ finally:
+ remove_tempfiles(t1, t2, t3, t4)
+
+# Next, check for proper behavior with 0-byte files.
+if verbose:
+ print "13. 0-byte files"
+try:
+ t1 = writeTmp(1, [""])
+ t2 = writeTmp(2, [""])
+ t3 = writeTmp(3, ["The only line there is.\n"])
+ t4 = writeTmp(4, [""])
+ fi = FileInput(files=(t1, t2, t3, t4))
+ line = fi.readline()
+ verify(line == 'The only line there is.\n')
+ verify(fi.lineno() == 1)
+ verify(fi.filelineno() == 1)
+ verify(fi.filename() == t3)
+ line = fi.readline()
+ verify(not line)
+ verify(fi.lineno() == 1)
+ verify(fi.filelineno() == 0)
+ verify(fi.filename() == t4)
+ fi.close()
+finally:
+ remove_tempfiles(t1, t2, t3, t4)
+
+if verbose:
+ print "14. Files that don't end with newline"
+try:
+ t1 = writeTmp(1, ["A\nB\nC"])
+ t2 = writeTmp(2, ["D\nE\nF"])
+ fi = FileInput(files=(t1, t2))
+ lines = list(fi)
+ verify(lines == ["A\n", "B\n", "C", "D\n", "E\n", "F"])
+ verify(fi.filelineno() == 3)
+ verify(fi.lineno() == 6)
+finally:
+ remove_tempfiles(t1, t2)