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I am wondering about this as well. I am familiar with debugging, but I don't know about "writing tests".

Jae

Yes, writing tests, is more code, I suggest you have a look at whatever programming language you are using.

Tests are basically code that asserts your code and software works as it is supposed to.

An example would be a function that returns a certain output given a value, you write a code asserting that it works and does what it should when given X value as a parameter.