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build/android/pylib/device/decorators_test.py

Index: build/android/pylib/device/decorators_test.py
diff --git a/build/android/pylib/device/decorators_test.py b/build/android/pylib/device/decorators_test.py
new file mode 100644
index 0000000000000000000000000000000000000000..be36aa904fcd0b32a43145ca8c676e7e638688d8
--- /dev/null
+++ b/build/android/pylib/device/decorators_test.py
@@ -0,0 +1,233 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+Unit tests for decorators.py.
+"""
+
+# pylint: disable=W0613
+
+import time
+import traceback
+import unittest
+
+from pylib.device import decorators
+from pylib.device import device_errors
+
+_DEFAULT_TIMEOUT = 30
+_DEFAULT_RETRIES = 3
+
+class DecoratorsTest(unittest.TestCase):
+  _decorated_function_called_count = 0
+
+  def testFunctionDecoratorSetsTimeout(self):
+    """ Tests that the WithTimeoutAndRetries decorator sets |timeout|
+        appropriately.
+    """
+    @decorators.WithTimeoutAndRetriesDefaults(
+        _DEFAULT_TIMEOUT, _DEFAULT_RETRIES)
+    def alwaysReturnTimeoutVal(timeout=None, retries=None):
+      return timeout
+
+    self.assertEquals(_DEFAULT_TIMEOUT, alwaysReturnTimeoutVal())
+    self.assertEquals(8, alwaysReturnTimeoutVal(timeout=8))
+
+  def testFunctionDecoratorSetsRetries(self):
+    """ Tests that the WithTimeoutAndRetries decorator sets |retries|
+        appropriately.
+    """
+    @decorators.WithTimeoutAndRetriesDefaults(
+        _DEFAULT_TIMEOUT, _DEFAULT_RETRIES)
+    def alwaysReturnRetriesVal(timeout=None, retries=None):
+      return retries
+
+    self.assertEquals(_DEFAULT_RETRIES, alwaysReturnRetriesVal())
+    self.assertEquals(1, alwaysReturnRetriesVal(retries=1))
+
+  def testFunctionDecoratorDoesTimeouts(self):
+    """ Tests that the WithTimeoutAndRetries decorator handles the timeout
+        logic.
+    """
+    DecoratorsTest._decorated_function_called_count = 0
+    @decorators.WithTimeoutAndRetriesDefaults(
+        _DEFAULT_TIMEOUT, _DEFAULT_RETRIES)
+    def alwaysTimesOut(timeout=None, retries=None):
+      DecoratorsTest._decorated_function_called_count += 1
+      time.sleep(100 * timeout)
+
+    start_time = time.time()
+    with self.assertRaises(device_errors.CommandTimeoutError):
+      alwaysTimesOut(timeout=1, retries=0)
+    elapsed_time = time.time() - start_time
+    self.assertTrue(elapsed_time >= 1)
+    self.assertEquals(1, DecoratorsTest._decorated_function_called_count)
+
+  def testFunctionDecoratorDoesRetries(self):
+    """ Tests that the WithTimeoutAndRetries decorator handles the retries
+        logic.
+    """
+    DecoratorsTest._decorated_function_called_count = 0
+    @decorators.WithTimeoutAndRetriesDefaults(
+        _DEFAULT_TIMEOUT, _DEFAULT_RETRIES)
+    def alwaysRaisesCommandFailedError(timeout=None, retries=None):
+      DecoratorsTest._decorated_function_called_count += 1
+      raise device_errors.CommandFailedError(['testCommand'],
+                                             'testCommand failed')
+
+    with self.assertRaises(device_errors.CommandFailedError):
+      alwaysRaisesCommandFailedError(retries=10)
+    self.assertEquals(11, DecoratorsTest._decorated_function_called_count)
+
+  def testFunctionDecoratorNoDefaults(self):
+    """ Tests that the WithTimeoutAndRetries decorator requires values for
+        timeout and retries when no defaults are supplied.
+    """
+    @decorators.WithTimeoutAndRetries
+    def requiresExplicitTimeoutAndRetries(timeout=None, retries=None):
+      return (timeout, retries)
+    with self.assertRaises(TypeError):
+      requiresExplicitTimeoutAndRetries()
+    with self.assertRaises(TypeError):
+      requiresExplicitTimeoutAndRetries(timeout=10)
+    with self.assertRaises(TypeError):
+      requiresExplicitTimeoutAndRetries(retries=0)
+    expected_timeout = 10
+    expected_retries = 1
+    actual_timeout, actual_retries = (
+        requiresExplicitTimeoutAndRetries(timeout=expected_timeout,
+                                          retries=expected_retries))
+    self.assertEquals(expected_timeout, actual_timeout)
+    self.assertEquals(expected_retries, actual_retries)
+
+  class _MethodDecoratorTestObject(object):
+    """ An object suitable for testing the
+        WithTimeoutAndRetriesFromInstance method decorator.
+    """
+
+    def __init__(self, test_case, default_timeout=_DEFAULT_TIMEOUT,
+                 default_retries=_DEFAULT_RETRIES):
+      self._test_case = test_case
+      self.default_timeout = default_timeout
+      self.default_retries = default_retries
+      self.function_call_counters = {
+          'alwaysRaisesCommandFailedError': 0,
+          'alwaysTimesOut': 0,
+          'requiresExplicitTimeoutAndRetries': 0,
+      }
+
+    # pylint: disable=R0201
+
+    @decorators.WithTimeoutAndRetriesFromInstance('default_timeout',
+                                                  'default_retries')
+    def alwaysReturnTimeoutVal(self, timeout=None, retries=None):
+      return timeout
+
+    @decorators.WithTimeoutAndRetriesFromInstance('default_timeout',
+                                                  'default_retries')
+    def alwaysReturnRetriesVal(self, timeout=None, retries=None):
+      return retries
+
+    # pylint: enable=R0201
+
+    @decorators.WithTimeoutAndRetriesFromInstance('default_timeout',
+                                                  'default_retries')
+    def alwaysTimesOut(self, timeout=None, retries=None):
+      self.function_call_counters['alwaysTimesOut'] += 1
+      time.sleep(100 * timeout)
+      self._test_case.assertFalse(True, msg='Failed to time out?')
+
+    @decorators.WithTimeoutAndRetriesFromInstance('default_timeout',
+                                                  'default_retries')
+    def alwaysRaisesCommandFailedError(self, timeout=None, retries=None):
+      self.function_call_counters['alwaysRaisesCommandFailedError'] += 1
+      raise device_errors.CommandFailedError(['testCommand'],
+                                             'testCommand failed')
+
+    @decorators.WithTimeoutAndRetries
+    def requiresExplicitTimeoutAndRetries(self, timeout=None, retries=None):
+      self.function_call_counters['requiresExplicitTimeoutAndRetries'] += 1
+      return (timeout, retries)
+
+  def testMethodDecoratorSetsTimeout(self):
+    """ Tests that the WithTimeoutAndRetriesFromInstance decorator sets
+        |timeout| appropriately.
+    """
+    expected_default_timeout = 37
+    expected_custom_timeout = 38
+    test_obj = self._MethodDecoratorTestObject(
+        self, default_timeout=expected_default_timeout)
+    self.assertEquals(
+        expected_default_timeout, test_obj.alwaysReturnTimeoutVal())
+    self.assertEquals(
+        expected_custom_timeout,
+        test_obj.alwaysReturnTimeoutVal(timeout=expected_custom_timeout))
+
+  def testMethodDecoratorSetsRetries(self):
+    """ Tests that the WithTimeoutAndRetriesFromInstance decorator sets
+        |retries| appropriately.
+    """
+    expected_default_retries = 5
+    expected_custom_retries = 6
+    test_obj = self._MethodDecoratorTestObject(
+        self, default_retries=expected_default_retries)
+    self.assertEquals(
+        expected_default_retries, test_obj.alwaysReturnRetriesVal())
+    self.assertEquals(
+        expected_custom_retries,
+        test_obj.alwaysReturnRetriesVal(retries=expected_custom_retries))
+
+  def testMethodDecoratorDoesTimeout(self):
+    """ Tests that the WithTimeoutAndRetriesFromInstance decorator handles
+        the timeout logic.
+    """
+    test_obj = self._MethodDecoratorTestObject(self)
+    start_time = time.time()
+    with self.assertRaises(device_errors.CommandTimeoutError):
+      try:
+        test_obj.alwaysTimesOut(timeout=1, retries=0)
+      except:
+        traceback.print_exc()
+        raise
+    elapsed_time = time.time() - start_time
+    self.assertTrue(elapsed_time >= 1)
+    self.assertEquals(1, test_obj.function_call_counters['alwaysTimesOut'])
+
+  def testMethodDecoratorDoesRetries(self):
+    """ Tests that the WithTimeoutAndRetriesFromInstance decorator handles
+        the retries logic.
+    """
+    test_obj = self._MethodDecoratorTestObject(self)
+    with self.assertRaises(device_errors.CommandFailedError):
+      try:
+        test_obj.alwaysRaisesCommandFailedError(retries=10)
+      except:
+        traceback.print_exc()
+        raise
+    self.assertEquals(
+        11, test_obj.function_call_counters['alwaysRaisesCommandFailedError'])
+
+  def testMethodDecoratorNoDefaults(self):
+    """ Tests that the WithTimeoutAndRetries decorator requires defaults
+        when applied to a method.
+    """
+    test_obj = self._MethodDecoratorTestObject(self)
+    with self.assertRaises(TypeError):
+      test_obj.requiresExplicitTimeoutAndRetries()
+    with self.assertRaises(TypeError):
+      test_obj.requiresExplicitTimeoutAndRetries(timeout=10)
+    with self.assertRaises(TypeError):
+      test_obj.requiresExplicitTimeoutAndRetries(retries=0)
+    expected_timeout = 10
+    expected_retries = 1
+    actual_timeout, actual_retries = (
+        test_obj.requiresExplicitTimeoutAndRetries(timeout=expected_timeout,
+                                                   retries=expected_retries))
+    self.assertEquals(expected_timeout, actual_timeout)
+    self.assertEquals(expected_retries, actual_retries)
+
+
+if __name__ == '__main__':
+  unittest.main()
+
+