F.I.R.S.T principles of testing

- Fast
- Isolated/Independent
- Repeatable
- Self-validating
- Timely

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👉Fast

🔹You should be able to run the unit tests at any point of their development cycle.

🔹Even if there are thousands of unit tests, they should run & show you the desired output in a matter of seconds
👉Isolated/Independent

🔹For any given unit test, for its environment variables, It should be independent of everything else so that it results is not influenced by any other factor

🔑Should follow the 3 A’s of testing: Arrange, Act, Assert
👉Repeatable

🔹Tests should be repeatable, their values shouldn’t change based on being run on different environments.
👉Self-validating

🔹You shouldn’t need to check manually, whether the test passed or not.
👉Timely

🔹Unit tests should be written just before the production code that makes them pass.

🔑If you write tests after the production code, then you may find the production code to be hard to test.
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