added test coverage for distutils.dep_util, and cleaned up the module

Lib/distutils/tests/test_dep_util.py

@@ -0,0 +1,101 @@
+"""Tests for distutils.dep_util."""
+import unittest
+import os
+import time
+
+from distutils.dep_util import newer, newer_pairwise, newer_group
+from distutils.errors import DistutilsFileError
+from distutils.tests import support
+
+# XXX needs to be tuned for the various platforms
+_ST_MIME_TIMER = 1
+
+class DepUtilTestCase(support.TempdirManager, unittest.TestCase):
+
+    def test_newer(self):
+        tmpdir = self.mkdtemp()
+        target = os.path.join(tmpdir, 'target')
+        source = os.path.join(tmpdir, 'source')
+
+        # Raise DistutilsFileError if 'source' does not exist.
+        self.assertRaises(DistutilsFileError, newer, target, source)
+
+        # Return true if 'source' exists and is more recently modified than
+        # 'target', or if 'source' exists and 'target' doesn't.
+        self.write_file(target)
+        self.assertTrue(newer(target, source))
+        self.write_file(source, 'xox')
+        time.sleep(_ST_MIME_TIMER)  # ensures ST_MTIME differs
+        self.write_file(target, 'xhx')
+        self.assertTrue(newer(target, source))
+
+        # Return false if both exist and 'target' is the same age or younger
+        # than 'source'.
+        self.write_file(source, 'xox'); self.write_file(target, 'xhx')
+        self.assertFalse(newer(target, source))
+        self.write_file(target, 'xox')
+        time.sleep(_ST_MIME_TIMER)
+        self.write_file(source, 'xhx')
+        self.assertFalse(newer(target, source))
+
+    def test_newer_pairwise(self):
+        tmpdir = self.mkdtemp()
+        sources = os.path.join(tmpdir, 'sources')
+        targets = os.path.join(tmpdir, 'targets')
+        os.mkdir(sources)
+        os.mkdir(targets)
+        one = os.path.join(sources, 'one')
+        two = os.path.join(sources, 'two')
+        three = os.path.join(targets, 'three')
+        four = os.path.join(targets, 'four')
+
+        self.write_file(one)
+        self.write_file(three)
+        self.write_file(four)
+        time.sleep(_ST_MIME_TIMER)
+        self.write_file(two)
+
+        self.assertEquals(newer_pairwise([one, two], [three, four]),
+                          ([two],[four]))
+
+    def test_newer_group(self):
+        tmpdir = self.mkdtemp()
+        sources = os.path.join(tmpdir, 'sources')
+        os.mkdir(sources)
+        one = os.path.join(sources, 'one')
+        two = os.path.join(sources, 'two')
+        three = os.path.join(sources, 'three')
+        target = os.path.join(tmpdir, 'target')
+
+        # return true if 'target' is out-of-date with respect to any file
+        # listed in 'sources'.
+        self.write_file(target)
+        time.sleep(_ST_MIME_TIMER)
+        self.write_file(one)
+        self.write_file(two)
+        self.write_file(three)
+        self.assertTrue(newer_group([one, two, three], target))
+
+        self.write_file(one)
+        self.write_file(three)
+        self.write_file(two)
+        time.sleep(0.1)
+        self.write_file(target)
+        self.assertFalse(newer_group([one, two, three], target))
+
+        # missing handling
+        os.remove(one)
+        self.assertRaises(OSError, newer_group, [one, two, three], target)
+
+        self.assertFalse(newer_group([one, two, three], target,
+                                     missing='ignore'))
+
+        self.assertTrue(newer_group([one, two, three], target,
+                                    missing='newer'))
+
+
+def test_suite():
+    return unittest.makeSuite(DepUtilTestCase)
+
+if __name__ == "__main__":
+    unittest.main(defaultTest="test_suite")