Use the Junit interface framework to perform the best practice of unit testing

Junit is a popular Java unit testing framework that is widely used in various units in testing and verification of Java applications.By using Junit, developers can write simple, efficient and repeated unit test cases to ensure the correctness of the code function. The following is the best practice of using Junit for unit testing. 1. Install Junit: First of all, you need to add the Junit library to the Java project.You can find a detailed description of how to download and install Junit on Junit's official website (https://junit.org/junit5/). 2. Create a test class: Create a new Java class for writing and running unit tests.The test class should be in the same package as the test to be tested, and the end is named after test.For example, if the class to be tested is called Calculator, the test class should be CalculatorTest. 3. Introduce the dependent items required: In the test class, you need to import the related classes and methods of Junit to use them to write test cases.Use the Import statement to import the necessary class. import org.junit.jupiter.api.Assertions; import org.junit.jupiter.api.Test; 4. Write test case: Use Junit's @teest annotation to mark an ordinary Java method as a test case.In this method, you can write a variety of assertions to verify whether the code of the code is in line with expectations. @Test public void testAddition() { Calculator calc = new Calculator(); int result = calc.add(2, 3); Assertions.assertEquals(5, result); } In the above example, we create a test case to verify whether the ADD () method of the Calculator class is executed correctly.We use the assertequals () method to compare whether the expected results are consistent with the actual results. 5. Run test: Use the operator provided by the Junit framework to perform test cases.You can use Junit's default testing operator, or you can use the construction tool (such as Gradle or Maven) from the motion starting test.After running the test, JUNIT will display the test results, including the number of cases, the number of cases and the number of cases of failure, and time of use. 6. Write multiple test cases: In order to test the code more comprehensive, you can write multiple test cases to check different scenes and expected results.With Junit, you can easily write and manage a large number of test cases. @Test public void testSubtraction() { Calculator calc = new Calculator(); int result = calc.subtract(5, 3); Assertions.assertEquals(2, result); } In the above example, we wrote a test case to verify whether the subtract () method of the Calculator class is executed correctly. By following the above best practice, you can use the Junit framework to test the Java code effective unit test.This will help improve the quality and reliability of the code and reduce potential errors and abnormal conditions.