JUnit 5 Quick Start: Java Unit Testing

Learn to write JUnit 5 tests using @Test, assertEquals, and assertNotEquals; observe green bars for passes and red bars for fails, and test normal and edge cases like vowel count.

The lecture explains assertTrue and assertFalse in JUnit 5, demonstrates pass/fail behavior and error messages like Expected true but was false, plus an is capitalized example.

Practice writing JUnit test methods using assertions for equal, not equal, true, and false values, annotated with @Test, and observe green test results as you run them.

Learn a four-step JUnit bug-fix workflow: write a failing test to isolate the bug, fix the code, and use regression tests to verify the rectangle utilities get perimeter.

Apply test driven development with JUnit to implement a feature request: add an equilateral check to the triangle utilities class, write failing and passing tests, and push code for review.

Understand before all and after all annotations in JUnit 5, for setup and teardown. See how a data test reads numbers and validates the largest is 40.

Use JUnit 5's assertArrayEquals to verify array length and identical elements, with clear error messages, then test graphics utilities' dim and brighten bounds on RGB values 0–255.

Practice performing a bug fix with JUnit 5: write a test that triggers the isosceles bug, observe red/green test results, fix the code, and submit for review.

Learn to write and run tests with JUnit asserts and annotations, including the assert equals and assert true methods, and apply these skills to bug fixes and feature requests.