New rtc dump analyzing tool in Python

tools/py_event_log_analyzer/misc_unittest.py

+#  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+#
+#  Use of this source code is governed by a BSD-style license
+#  that can be found in the LICENSE file in the root of the source
+#  tree. An additional intellectual property rights grant can be found
+#  in the file PATENTS.  All contributing project authors may
+#  be found in the AUTHORS file in the root of the source tree.
+
+"""Run the tests with
+
+      python -m unittest misc_unittest
+or
+      python3 -m unittest misc_unittest
+"""
+
+from __future__ import division
+import random
+import unittest
+
+import misc
+
+
+class TestMisc(unittest.TestCase):

[phoglund, 2016/06/03 08:11:07]

We need to get these tests actually running on presubmit as well. I think if you
edit PRESUBMIT.py in the WebRTC src/ dir and add this dir to test_directories
for _RunPythonTests it should work. You can test by running git cl presubmit
(perhaps intentionally break one of the tests to ensure the errors fails the
presubmit).

[aleloi, 2016/06/09 12:00:44]

I did that. The test had to be renamed to end with "_test.py", to run the tests
on execution and to be executable.

+
+  def testUnwrapMod3(self):

[phoglund, 2016/06/03 08:11:07]

Nice!

+    data = [0, 1, 2, 0, -1, -2, -3, -4]
+    unwrapped_3 = misc.unwrap(data, 3)
+    self.assertEqual([0, 1, 2, 3, 2, 1, 0, -1], unwrapped_3)
+
+  def testUnwrapMod4(self):
+    data = [0, 1, 2, 0, -1, -2, -3, -4]
+    unwrapped_4 = misc.unwrap(data, 4)
+    self.assertEqual([0, 1, 2, 0, -1, -2, -3, -4], unwrapped_4)
+
+  def testDataShouldNotChangeAfterUnwrap(self):
+    data = [0, 1, 2, 0, -1, -2, -3, -4]
+    _ = misc.unwrap(data, 4)
+
+    self.assertEqual([0, 1, 2, 0, -1, -2, -3, -4], data)
+
+  def testRandomlyMultiplesOfModAdded(self):
+    # `unwrap` definition says only multiples of mod are added.
+    random_data = [random.randint(0, 9) for _ in range(100)]
+
+    for mod in range(1, 100):
+      random_data_unwrapped_mod = misc.unwrap(random_data, mod)
+
+      for (old_a, a) in zip(random_data, random_data_unwrapped_mod):
+        self.assertEqual((old_a - a) % mod, 0)
+
+  def testRandomlyAgainstInequalityDefinition(self):
+    # Data has to satisfy -mod/2 <= difference < mod/2 for every
+    # difference between consecutive values after unwrap.
+    random_data = [random.randint(0, 9) for _ in range(100)]
+
+    for mod in range(1, 100):
+      random_data_unwrapped_mod = misc.unwrap(random_data, mod)
+
+      for (a, b) in zip(random_data_unwrapped_mod,
+                        random_data_unwrapped_mod[1:]):
+        self.assertTrue(-mod / 2 <= b - a < mod / 2)
+
+  def testRandomlyDataShouldNotChangeAfterUnwrap(self):
+    random_data = [random.randint(0, 9) for _ in range(100)]
+    random_data_copy = random_data[:]
+    for mod in range(1, 100):
+      _ = misc.unwrap(random_data, mod)
+
+      self.assertEqual(random_data, random_data_copy)