Unit Test and TDD Fundamentals
TDD results in unit tests. A unit test verifies the behavior of a code unit, where a unit is the smallest testable piece of an application. You typically write a unit test in the programming language of the unit.
Unit Test Organization and Execution
A single unit test consists of a descriptive name and a series of code statements, conceptually divided into four (ordered) parts.
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(Optional) statements that set up a context for execution
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One or more statements to invoke the behavior you want to verify
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One or more statements to verify the expected outcome
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(Optional) cleanup statements (for example, to release allocated memory)
Some folks refer to the first three parts as Given-When-Then. In other words, Given a context, ...
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