Allow trailing separator in fake_filesystem.add_real_directory()

- fixes #446

CHANGES.md

@@ -8,6 +8,7 @@ The release versions are PyPi releases.
 #### Fixes
   * fixed recursion error on unpickling the fake file system 
     ([#445](../../issues/445))
+  * allow trailing path in `add_real_directory` ([#446](../../issues/446))
 
 ## [Version 3.5](https://pypi.python.org/pypi/pyfakefs/3.5)
 

pyfakefs/fake_filesystem.py

@@ -2397,6 +2397,7 @@ def add_real_directory(self, source_path, read_only=True, lazy_read=True,
             OSError: if the directory does not exist in the real file system.
             IOError: if the directory already exists in the fake file system.
         """
+        source_path = self._path_without_trailing_separators(source_path)
         if not os.path.exists(source_path):
             self.raise_io_error(errno.ENOENT, source_path)
         target_path = target_path or source_path

pyfakefs/tests/fake_filesystem_unittest_test.py

@@ -309,6 +309,14 @@ def test_add_real_directory(self):
         self.assertTrue(self.fs.exists(
             os.path.join(real_dir_path, 'fake_filesystem.py')))
 
+    def test_add_real_directory_with_backslash(self):
+        """Add a real directory ending with a path separator."""
+        real_dir_path = os.path.split(os.path.dirname(self.filepath))[0]
+        self.fs.add_real_directory(real_dir_path + os.sep)
+        self.assertTrue(self.fs.exists(real_dir_path))
+        self.assertTrue(self.fs.exists(
+            os.path.join(real_dir_path, 'fake_filesystem.py')))
+
 
 class TestPyfakefsTestCase(unittest.TestCase):
     def setUp(self):