[JAVA] Get the name of the test case in the JUnit test class

I learned how to figure out the test method name of a JUnit test class. You can use it to grasp the test case with @Before.

Information can be obtained by adding @ org.junit.Rule to ʻorg.junit.rules.TestName` and defining the fields of the test class.

 * TestName
public TestName testName = new TestName();

// want to know test case name.
System.out.println("[TestName] : " + testName.getMethodName());

It's convenient, I would like to use it from now on. For your reference.

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