Test-Driven Development known as TDD is a critical part of the mission-critical application. Where any erroneous condition can have a fatal cause.
In a nutshell, Test-driven Development is a programming technique that requires you to write a actual test code and automate test code.
It is important to understand TDD life cycle as follows:
Write the test first.
Since there is no implementation of the code for the test, test should fail.
Run the test, should fail.
Write just enough implementation for code to compile and test to pass.
Now Write the code.
Run the test.
Make sure test passes.
Re-Factor the code.
Ensure test passes again.
Repeat the process continuously.
Keep Repeating the above process until business requirement is met and there is no redundant or duplicate code. Also, ensure the code is well re-factored.
Test-Driven Development is not about just testing. Its a myth amongst the developer community.
Test-Driven Development is about development and design, specifically improving the quality and design of code.
Using tests recursively is the main essence of TDD.
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