JUnit fundamentals
A unit test is a collection of tests designed to verify the behavior of a single unit.
A unit is always the smallest testable part of an application. In object-oriented programming, the smallest unit is always a class.
JUnit tests your class by scenario, and you have to create a testing scenario that uses the following elements:
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| Instantiate an object |
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| Invoke methods |
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| Verify assertions |
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Note: An assertion is a statement that allows you to test the validity of any assumptions made in your code. |
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