Which of the following statements is a correct description of a type of test double?

Question

BlackTom AI · Accepted Answer

The question asks for a correct description of a type of test double, and the provided option describes a spy's behavior. 
Option presented: 'A spy records the calls it receives so that assertions can be made after execution of the functionality invoked during the test.' This aligns with how spies are defined in test double taxonomy: a spy wraps or stands in for a collaborator and logs interactions (such as method calls, arguments, and timing) so that the test can assert on those interactions after the code under test has run. 
Reasoning about why this describes a spy: spies are intended to observe behavior rather than just return a canned value; the core purpose is to enable post-execution assertions about interactions, which this statement captures. The emphasis on recording calls and enabling assertions matches the standard definition of a spy in unit testing.

If we compare broadly to other test doubles to evaluate potential misconceptions: a mock typically combines behavior specification with verification, but often emphasizes predefined expectations; a stub provides canned responses with no emphasis on recording interactions; a fake offers a simplified working implementation. The statement in question specifically highlights recording interactions for later assertions, which is the hallmark of a spy rather than a stub, mock, or fake.

Note: The provided data lacks additional answer options for comparison. In a typical question with multiple choices, we would contrast this option against others to reiterate why spies uniquely fit the description given. Here, the statement stands as a correct description of a test double type (spy) by focusing on observational capability and post-run assertions.

SOFT3202 COMP9202 (ND) Quiz 13

Which of the following statements is a correct description of a type of test double?

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