Changed FilePathField tests to use it's own directory with test files.

In previous version it used /django/forms/ which was fragile - for some
users .pyc files were not generated and this tests failed.

tests/regressiontests/forms/tests/fields.py

@@ -985,12 +985,11 @@ def test_filepathfield_4(self):
             self.assertTrue(got[0].endswith(exp[0]))
 
     def test_filepathfield_folders(self):
-        path = forms.__file__
-        path = os.path.dirname(path) + '/'
+        path = os.path.dirname(__file__) + '/filepath_test_files/'
         f = FilePathField(path=path, allow_folders=True, allow_files=False)
         f.choices.sort()
         expected = [
-            ('/django/forms/extras', 'extras'),
+            ('/tests/regressiontests/forms/tests/filepath_test_files/directory', 'directory'),
         ]
         for exp, got in zip(expected, fix_os_paths(f.choices)):
             self.assertEqual(exp[1], got[1])
@@ -999,23 +998,15 @@ def test_filepathfield_folders(self):
         f = FilePathField(path=path, allow_folders=True, allow_files=True)
         f.choices.sort()
         expected = [
-            ('/django/forms/__init__.py', '__init__.py'),
-            ('/django/forms/__init__.pyc', '__init__.pyc'),
-            ('/django/forms/extras', 'extras'),
-            ('/django/forms/fields.py', 'fields.py'),
-            ('/django/forms/fields.pyc', 'fields.pyc'),
-            ('/django/forms/forms.py', 'forms.py'),
-            ('/django/forms/forms.pyc', 'forms.pyc'),
-            ('/django/forms/formsets.py', 'formsets.py'),
-            ('/django/forms/formsets.pyc', 'formsets.pyc'),
-            ('/django/forms/models.py', 'models.py'),
-            ('/django/forms/models.pyc', 'models.pyc'),
-            ('/django/forms/util.py', 'util.py'),
-            ('/django/forms/util.pyc', 'util.pyc'),
-            ('/django/forms/widgets.py', 'widgets.py'),
-            ('/django/forms/widgets.pyc', 'widgets.pyc')
+            ('/tests/regressiontests/forms/tests/filepath_test_files/.dot-file', '.dot-file'),
+            ('/tests/regressiontests/forms/tests/filepath_test_files/directory', 'directory'),
+            ('/tests/regressiontests/forms/tests/filepath_test_files/fake-image.jpg', 'fake-image.jpg'),
+            ('/tests/regressiontests/forms/tests/filepath_test_files/real-text-file.txt', 'real-text-file.txt'),
         ]
-        for exp, got in zip(expected, fix_os_paths(f.choices)):
+
+        actual = fix_os_paths(f.choices)
+        self.assertEqual(len(expected), len(actual))
+        for exp, got in zip(expected, actual):
             self.assertEqual(exp[1], got[1])
             self.assertTrue(got[0].endswith(exp[0]))