The term "test case" is used to express a set of inputs (or user actions) and the expected outputs to be used in testing out software.

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In order to test software to see if it is working correctly, a tester will often start with a series of inputs and the expected outputs. If, when running the program on the inputs, the outputs are not the expected results, then errors are assumed to exist. These input/output pairs are known as test cases.

The Term "Test Case" Is Used to Express a Set