Spring Framework Master Class - Java Spring the Modern Way - Step 3-First Code and First Unit Test

The video tutorial covers the process of writing and running JUnit tests for a sum method in a Java class. It begins with setting up a simple test case to verify the sum of three numbers. The tutorial explains how to use JUnit's assertEquals method to check if the expected and actual results match. It demonstrates testing with different inputs and highlights the importance of continuous testing to catch bugs introduced by code changes. The video concludes with tips on optimizing test code by reusing instances and inlining variables.

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