Testing with JUnit

- [Instructor] I'm going to give you a quick … introduction to JUnit. … JUnit is a very common framework … that we use to test Java code. … Okay, so I'm going to make a test in here … and I do that with test, control, space. … I'm going to select the Jupiter version … because it's the coolest and newest. … What that's done is it's made the test framework for me. … It's got an annotation with Test there … and I can run this … and I'll get a green bar. … Green bars are good, … but green bars with no implementation, not so great. … So what you actually want to put inside your test … are some asserts. … The assert that I use most often is assertEquals … and that's used for testing if two things are the same. … The expected value is going to go in here … as the first perimeter and the actual as the second. … So let's think of a really really easy example. … If I wanted to check the answer to two plus two … I would put the actual code in there … and then the expected value back here. … Now when I run it it's actually running through here …