About JUnit Usage

Why use JUnit, what kind of tool is it?
JUnit is a unit test tool.

To put it bluntly, JUnit allows us to execute a method without the main method.

Requirements for the method being tested:
1. The method being tested cannot have parameters and cannot have a return value.
2. To use JUnit, you need to import JUnit's jar package.
3. For the test class, there must be no parameter constructs.

Need to use some annotation (annotations)

@Test: Test method (******)
@Ignore: Ignored test methods
@Before: Executes one time before each test method executes.
@After: Executes once after each test method is executed.
@BeforeClass: Run static before all tests begin
@AfterClass: Run static after all tests have finished

About JUnit Usage