test-doubles.md
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The thing we are testing is called a "System under test" (SUT) (XTD) or "object under test" (POODR, p. 195, Figure 9.1). We'll use SUT. It is fair to think about other things being under test, such as a class, object, method, or application, but the idea here is that the thing under test is defined by the scope of the test itself. Other objects may be involved, such as a "depended-on component" (DOC).
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+![](images/metz-poodr-testing.png)
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* SUT - System under test
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* DOC - Depended-on component
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Other topics:
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-* The four-phase test.
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+* The four-phase test.
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