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Add FIRST to Testing Section #123

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Add FIRST to Testing Section #123

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14 changes: 14 additions & 0 deletions README.md
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Expand Up @@ -2470,6 +2470,20 @@ There's no excuse to not write tests. There's [plenty of good .NET test framewor

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<summary><b>FIRST</b></summary>
A good and clean unit test should follow the FIRST principles.

- <b>Fast</b>: it should take little time to run, preferred milliseconds.
- <b>Isolated</b>: it should be isolated from each other and isolated from "external world" (such as HTTP calls, databases, files etc).
- <b>Repeatable</b>: it should always return the same result, unless the system under test changed..
- <b>Self-Checking</b>: it should be able automatically detect if their passed or failed.
- <b>Timely</b>: it should not take too much time to be written when compared to their system under test code.

> Source https://learn.microsoft.com/en-us/dotnet/core/testing/unit-testing-best-practices#characteristics-of-a-good-unit-test

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<details>
<summary><b>Single concept per test</b></summary>

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