diff --git a/Lib/distutils/command/install_lib.py b/Lib/distutils/command/install_lib.py
index 94895f4..022efa4 100644
--- a/Lib/distutils/command/install_lib.py
+++ b/Lib/distutils/command/install_lib.py
@@ -5,7 +5,7 @@
 
 __revision__ = "$Id$"
 
-import sys, os
+import os
 from distutils.core import Command
 from distutils.errors import DistutilsOptionError
 
@@ -57,7 +57,6 @@
         self.skip_build = None
 
     def finalize_options(self):
-
         # Get all the information we need to install pure Python modules
         # from the umbrella 'install' command -- build (source) directory,
         # install (target) directory, and whether to compile .py files.
@@ -78,7 +77,7 @@
         if not isinstance(self.optimize, int):
             try:
                 self.optimize = int(self.optimize)
-                assert 0 <= self.optimize <= 2
+                assert self.optimize in (0, 1, 2)
             except (ValueError, AssertionError):
                 raise DistutilsOptionError("optimize must be 0, 1, or 2")
 
@@ -95,7 +94,6 @@
         if outfiles is not None and self.distribution.has_pure_modules():
             self.byte_compile(outfiles)
 
-
     # -- Top-level worker functions ------------------------------------
     # (called from 'run()')
 
diff --git a/Lib/distutils/tests/test_install_lib.py b/Lib/distutils/tests/test_install_lib.py
new file mode 100644
index 0000000..69a24fa
--- /dev/null
+++ b/Lib/distutils/tests/test_install_lib.py
@@ -0,0 +1,84 @@
+"""Tests for distutils.command.install_data."""
+import sys
+import os
+import unittest
+
+from distutils.command.install_lib import install_lib
+from distutils.extension import Extension
+from distutils.tests import support
+from distutils.errors import DistutilsOptionError
+
+class InstallLibTestCase(support.TempdirManager,
+                         support.LoggingSilencer,
+                         unittest.TestCase):
+
+
+    def test_finalize_options(self):
+        pkg_dir, dist = self.create_dist()
+        cmd = install_lib(dist)
+
+        cmd.finalize_options()
+        self.assertEquals(cmd.compile, 1)
+        self.assertEquals(cmd.optimize, 0)
+
+        # optimize must be 0, 1, or 2
+        cmd.optimize = 'foo'
+        self.assertRaises(DistutilsOptionError, cmd.finalize_options)
+        cmd.optimize = '4'
+        self.assertRaises(DistutilsOptionError, cmd.finalize_options)
+
+        cmd.optimize = '2'
+        cmd.finalize_options()
+        self.assertEquals(cmd.optimize, 2)
+
+    def test_byte_compile(self):
+        pkg_dir, dist = self.create_dist()
+        cmd = install_lib(dist)
+        cmd.compile = cmd.optimize = 1
+
+        f = os.path.join(pkg_dir, 'foo.py')
+        self.write_file(f, '# python file')
+        cmd.byte_compile([f])
+        self.assert_(os.path.exists(os.path.join(pkg_dir, 'foo.pyc')))
+        self.assert_(os.path.exists(os.path.join(pkg_dir, 'foo.pyo')))
+
+    def test_get_outputs(self):
+        pkg_dir, dist = self.create_dist()
+        cmd = install_lib(dist)
+
+        # setting up a dist environment
+        cmd.compile = cmd.optimize = 1
+        cmd.install_dir = pkg_dir
+        f = os.path.join(pkg_dir, 'foo.py')
+        self.write_file(f, '# python file')
+        cmd.distribution.py_modules = [pkg_dir]
+        cmd.distribution.ext_modules = [Extension('foo', ['xxx'])]
+        cmd.distribution.packages = [pkg_dir]
+        cmd.distribution.script_name = 'setup.py'
+
+        # get_output should return 4 elements
+        self.assertEquals(len(cmd.get_outputs()), 4)
+
+    def test_get_inputs(self):
+        pkg_dir, dist = self.create_dist()
+        cmd = install_lib(dist)
+
+        # setting up a dist environment
+        cmd.compile = cmd.optimize = 1
+        cmd.install_dir = pkg_dir
+        f = os.path.join(pkg_dir, 'foo.py')
+        self.write_file(f, '# python file')
+        cmd.distribution.py_modules = [pkg_dir]
+        cmd.distribution.ext_modules = [Extension('foo', ['xxx'])]
+        cmd.distribution.packages = [pkg_dir]
+        cmd.distribution.script_name = 'setup.py'
+
+        # get_input should return 2 elements
+        self.assertEquals(len(cmd.get_inputs()), 2)
+
+
+def test_suite():
+    return unittest.makeSuite(InstallLibTestCase)
+
+if __name__ == "__main__":
+    unittest.main(defaultTest="test_suite")