html#basic_concepts">Basic Concepts</a>
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    <a href="ch13.html#an_example_test_double">An Example Test Double</a>
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    <a href="ch13.html#seams">Seams</a>
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    <a href="ch13.html#mocking_frameworks">Mocking Frameworks</a>
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    <a href="ch13.html#techniques_for_using_test_doubles">Techniques for Using Test Doubles</a>
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