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Software Test Design
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When writing manual tests, you can choose how precise your descriptions are. Either you can specify exactly what to do and how to do it, or you can only say what to do, leaving the details for each tester to decide.
For instance, a descriptive test might say: “On the user settings page, upload an avatar .jpeg image between 100 KB and 5 MB in size.”
Note that while there are instructions on what to do, the tester can use any image they like that matches those criteria. In contrast, a prescriptive test might say exactly which file to use: “On the user settings page, upload /fixtures/image1.jpeg as an avatar image.”
Here, image1.jpeg is a suitable image within that size range. If you are testing a text input, you can specify the exact strings to try or just describe what contents they should have.
Prescriptive tests are also known as low-level test cases, with complete detail on what to do and how to do it...
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