In the context of software or information modeling, a happy path is a default scenario featuring no exceptional or error conditions, and comprises the sequence of activities executed if everything goes as expected. For example, the happy path for a function validating credit card numbers would be where none of the validation rules raise an error, thus letting execution continue successfully to the end, generating a positive response.
Process steps for a happy path are also used in the context of a use case. In contrast to the happy path, process steps for alternate paths and exception paths may also be documented.
Happy path testing is a well-defined test case using known input, which executes without exception and produces an expected output.
Happy day scenario and golden path are synonyms for happy path.
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