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      1 # Copyright (c) 2010 Google Inc. All rights reserved.
      2 #
      3 # Redistribution and use in source and binary forms, with or without
      4 # modification, are permitted provided that the following conditions are
      5 # met:
      6 #
      7 #     * Redistributions of source code must retain the above copyright
      8 # notice, this list of conditions and the following disclaimer.
      9 #     * Redistributions in binary form must reproduce the above
     10 # copyright notice, this list of conditions and the following disclaimer
     11 # in the documentation and/or other materials provided with the
     12 # distribution.
     13 #     * Neither the name of Google Inc. nor the names of its
     14 # contributors may be used to endorse or promote products derived from
     15 # this software without specific prior written permission.
     16 #
     17 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     18 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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     20 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     21 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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     24 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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     26 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     27 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28 
     29 import unittest
     30 
     31 from webkitpy.common.memoized import memoized
     32 
     33 
     34 class _TestObject(object):
     35     def __init__(self):
     36         self.callCount = 0
     37 
     38     @memoized
     39     def memoized_add(self, argument):
     40         """testing docstring"""
     41         self.callCount += 1
     42         if argument is None:
     43             return None  # Avoid the TypeError from None + 1
     44         return argument + 1
     45 
     46 
     47 class MemoizedTest(unittest.TestCase):
     48     def test_caching(self):
     49         test = _TestObject()
     50         test.callCount = 0
     51         self.assertEqual(test.memoized_add(1), 2)
     52         self.assertEqual(test.callCount, 1)
     53         self.assertEqual(test.memoized_add(1), 2)
     54         self.assertEqual(test.callCount, 1)
     55 
     56         # Validate that callCount is working as expected.
     57         self.assertEqual(test.memoized_add(2), 3)
     58         self.assertEqual(test.callCount, 2)
     59 
     60     def test_tearoff(self):
     61         test = _TestObject()
     62         # Make sure that get()/tear-offs work:
     63         tearoff = test.memoized_add
     64         self.assertEqual(tearoff(4), 5)
     65         self.assertEqual(test.callCount, 1)
     66