New unit test for the mimetypes module, to avoid future regressions.

Lib/test/test_mimetypes.py

+import mimetypes
+import StringIO
+import unittest
+
+import test_support
+
+# Tell it we don't know about external files:
+mimetypes.knownfiles = []
+
+
+class MimeTypesTestCase(unittest.TestCase):
+    def setUp(self):
+        self.db = mimetypes.MimeTypes()
+
+    def test_default_data(self):
+        self.assertEqual(self.db.guess_type("foo.html"),
+                         ("text/html", None))
+        self.assertEqual(self.db.guess_type("foo.tgz"),
+                         ("application/x-tar", "gzip"))
+        self.assertEqual(self.db.guess_type("foo.tar.gz"),
+                         ("application/x-tar", "gzip"))
+        self.assertEqual(self.db.guess_type("foo.tar.Z"),
+                         ("application/x-tar", "compress"))
+
+    def test_data_urls(self):
+        self.assertEqual(self.db.guess_type("data:,thisIsTextPlain"),
+                         ("text/plain", None))
+        self.assertEqual(self.db.guess_type("data:;base64,thisIsTextPlain"),
+                         ("text/plain", None))
+        self.assertEqual(self.db.guess_type("data:text/x-foo,thisIsTextXFoo"),
+                         ("text/x-foo", None))
+
+    def test_file_parsing(self):
+        sio = StringIO.StringIO("x-application/x-unittest pyunit\n")
+        self.db.readfp(sio)
+        self.assertEqual(self.db.guess_type("foo.pyunit"),
+                         ("x-application/x-unittest", None))
+        self.assertEqual(self.db.guess_extension("x-application/x-unittest"),
+                         ".pyunit")
+
+
+test_support.run_unittest(MimeTypesTestCase)