[Telemetry] Add pyfakefs to telemetry/third_party

tools/telemetry/third_party/pyfakefs/pyfakefs/fake_filesystem_unittest_test.py

+#! /usr/bin/env python
+#
+# Copyright 2014 Altera Corporation. All Rights Reserved.
+# Author: John McGehee
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Test the :py:class`pyfakefs.fake_filesystem_unittest.TestCase` base class.
+"""
+
+import os
+import glob
+import shutil
+import tempfile
+import sys
+if sys.version_info < (2, 7):
+    import unittest2 as unittest
+else:
+    import unittest
+import fake_filesystem_unittest
+
+
+class TestPyfakefsUnittest(fake_filesystem_unittest.TestCase): # pylint: disable=R0904
+    '''Test the pyfakefs.fake_filesystem_unittest.TestCase` base class.'''
+
+    def setUp(self):
+        '''Set up the fake file system'''
+        self.setUpPyfakefs()
+
+    def tearDown(self):
+        '''Tear down the fake file system'''
+        self.tearDownPyfakefs()
+        
+    def test_file(self):
+        '''Test that the fake `file()` function is bound'''
+        self.assertFalse(os.path.exists('/fake_file.txt'))
+        with file('/fake_file.txt', 'w') as f:
+            f.write("This test file was created using the file() function.\n")
+        self.assertTrue(self.fs.Exists('/fake_file.txt'))
+        with file('/fake_file.txt') as f:
+            content = f.read()
+        self.assertEqual(content,
+                         'This test file was created using the file() function.\n')
+            
+    def test_open(self):
+        '''Test that the fake `open()` function is bound'''
+        self.assertFalse(os.path.exists('/fake_file.txt'))
+        with open('/fake_file.txt', 'w') as f:
+            f.write("This test file was created using the open() function.\n")
+        self.assertTrue(self.fs.Exists('/fake_file.txt'))
+        with open('/fake_file.txt') as f:
+            content = f.read()
+        self.assertEqual(content,
+                         'This test file was created using the open() function.\n')
+            
+    def test_os(self):
+        '''Test that the fake os module is bound'''
+        self.assertFalse(self.fs.Exists('/test/dir1/dir2'))          
+        os.makedirs('/test/dir1/dir2')
+        self.assertTrue(self.fs.Exists('/test/dir1/dir2'))          
+        
+    def test_glob(self):
+        '''Test that the fake glob module is bound'''
+        self.assertItemsEqual(glob.glob('/test/dir1/dir*'),
+                              [])
+        self.fs.CreateDirectory('/test/dir1/dir2a')
+        self.assertItemsEqual(glob.glob('/test/dir1/dir*'),
+                              ['/test/dir1/dir2a'])
+        self.fs.CreateDirectory('/test/dir1/dir2b')
+        self.assertItemsEqual(glob.glob('/test/dir1/dir*'),
+                              ['/test/dir1/dir2a', '/test/dir1/dir2b'])
+
+    def test_shutil(self):
+        '''Test that the fake shutil module is bound'''
+        self.fs.CreateDirectory('/test/dir1/dir2a')
+        self.fs.CreateDirectory('/test/dir1/dir2b')
+        self.assertTrue(self.fs.Exists('/test/dir1/dir2b'))
+        self.assertTrue(self.fs.Exists('/test/dir1/dir2a'))
+       
+        shutil.rmtree('/test/dir1')
+        self.assertFalse(self.fs.Exists('/test/dir1'))
+
+    def test_tempfile(self):
+        '''Test that the fake tempfile module is bound'''
+        with tempfile.NamedTemporaryFile() as tf:
+            tf.write('Temporary file contents\n')
+            name = tf.name
+            self.assertTrue(self.fs.Exists(tf.name))
+        
+                      
+if __name__ == "__main__":
+    unittest.main()