1 files changed, 141 insertions, 0 deletions
diff --git a/catapult/telemetry/third_party/web-page-replay/proxyshaper_test.py b/catapult/telemetry/third_party/web-page-replay/proxyshaper_test.py
new file mode 100755
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+++ b/catapult/telemetry/third_party/web-page-replay/proxyshaper_test.py
@@ -0,0 +1,141 @@
+#!/usr/bin/env python
+# Copyright 2012 Google Inc. All Rights Reserved.
+#
+# 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.
+
+"""Unit tests for proxyshaper.
+
+Usage:
+$ ./proxyshaper_test.py
+"""
+
+import proxyshaper
+import StringIO
+import unittest
+
+
+# pylint: disable=bad-whitespace
+VALID_RATES = (
+    # input,       expected_bps
+    ( '384Kbit/s',   384000),
+    ('1536Kbit/s',  1536000),
+    (   '1Mbit/s',  1000000),
+    (   '5Mbit/s',  5000000),
+    (  '2MByte/s', 16000000),
+    (         '0',        0),
+    (         '5',        5),
+    (      384000,   384000),
+    )
+
+ERROR_RATES = (
+    '1536KBit/s',  # Older versions of dummynet used capital 'B' for bytes.
+    '1Mbyte/s',    # Require capital 'B' for bytes.
+    '5bps',
+    )
+
+
+class TimedTestCase(unittest.TestCase):
+  def assertValuesAlmostEqual(self, expected, actual, tolerance=0.05):
+    """Like the following with nicer default message:
+           assertTrue(expected <= actual + tolerance &&
+                      expected >= actual - tolerance)
+    """
+    delta = tolerance * expected
+    if actual > expected + delta or actual < expected - delta:
+      self.fail('%s is not equal to expected %s +/- %s%%' % (
+              actual, expected, 100 * tolerance))
+
+
+class RateLimitedFileTest(TimedTestCase):
+  def testReadLimitedBasic(self):
+    num_bytes = 1024
+    bps = 384000
+    request_counter = lambda: 1
+    f = StringIO.StringIO(' ' * num_bytes)
+    limited_f = proxyshaper.RateLimitedFile(request_counter, f, bps)
+    start = proxyshaper.TIMER()
+    self.assertEqual(num_bytes, len(limited_f.read()))
+    expected_ms = 8.0 * num_bytes / bps * 1000.0
+    actual_ms = (proxyshaper.TIMER() - start) * 1000.0
+    self.assertValuesAlmostEqual(expected_ms, actual_ms)
+
+  def testReadlineLimitedBasic(self):
+    num_bytes = 1024 * 8 + 512
+    bps = 384000
+    request_counter = lambda: 1
+    f = StringIO.StringIO(' ' * num_bytes)
+    limited_f = proxyshaper.RateLimitedFile(request_counter, f, bps)
+    start = proxyshaper.TIMER()
+    self.assertEqual(num_bytes, len(limited_f.readline()))
+    expected_ms = 8.0 * num_bytes / bps * 1000.0
+    actual_ms = (proxyshaper.TIMER() - start) * 1000.0
+    self.assertValuesAlmostEqual(expected_ms, actual_ms)
+
+  def testReadLimitedSlowedByMultipleRequests(self):
+    num_bytes = 1024
+    bps = 384000
+    request_count = 2
+    request_counter = lambda: request_count
+    f = StringIO.StringIO(' ' * num_bytes)
+    limited_f = proxyshaper.RateLimitedFile(request_counter, f, bps)
+    start = proxyshaper.TIMER()
+    num_read_bytes = limited_f.read()
+    self.assertEqual(num_bytes, len(num_read_bytes))
+    expected_ms = 8.0 * num_bytes / (bps / float(request_count)) * 1000.0
+    actual_ms = (proxyshaper.TIMER() - start) * 1000.0
+    self.assertValuesAlmostEqual(expected_ms, actual_ms)
+
+  def testWriteLimitedBasic(self):
+    num_bytes = 1024 * 10 + 350
+    bps = 384000
+    request_counter = lambda: 1
+    f = StringIO.StringIO()
+    limited_f = proxyshaper.RateLimitedFile(request_counter, f, bps)
+    start = proxyshaper.TIMER()
+    limited_f.write(' ' * num_bytes)
+    self.assertEqual(num_bytes, len(limited_f.getvalue()))
+    expected_ms = 8.0 * num_bytes / bps * 1000.0
+    actual_ms = (proxyshaper.TIMER() - start) * 1000.0
+    self.assertValuesAlmostEqual(expected_ms, actual_ms)
+
+  def testWriteLimitedSlowedByMultipleRequests(self):
+    num_bytes = 1024 * 10
+    bps = 384000
+    request_count = 2
+    request_counter = lambda: request_count
+    f = StringIO.StringIO(' ' * num_bytes)
+    limited_f = proxyshaper.RateLimitedFile(request_counter, f, bps)
+    start = proxyshaper.TIMER()
+    limited_f.write(' ' * num_bytes)
+    self.assertEqual(num_bytes, len(limited_f.getvalue()))
+    expected_ms = 8.0 * num_bytes / (bps / float(request_count)) * 1000.0
+    actual_ms = (proxyshaper.TIMER() - start) * 1000.0
+    self.assertValuesAlmostEqual(expected_ms, actual_ms)
+
+
+class GetBitsPerSecondTest(unittest.TestCase):
+  def testConvertsValidValues(self):
+    for dummynet_option, expected_bps in VALID_RATES:
+      bps = proxyshaper.GetBitsPerSecond(dummynet_option)
+      self.assertEqual(
+          expected_bps, bps, 'Unexpected result for %s: %s != %s' % (
+              dummynet_option, expected_bps, bps))
+
+  def testRaisesOnUnexpectedValues(self):
+    for dummynet_option in ERROR_RATES:
+      self.assertRaises(proxyshaper.BandwidthValueError,
+                        proxyshaper.GetBitsPerSecond, dummynet_option)
+
+
+if __name__ == '__main__':
+  unittest.main()