Use the Mockito JUNIT JUPITER framework to create and use the Mock object

Use the Mockito JUNIT JUPITER framework to create and use the Mock object Mockito is a popular Java test framework for creating and using Mock objects.It can be used to simulate the dependent objects that are difficult to obtain or created during the test, so as to perform better unit testing. It is very simple to use Mockito in the Junit Jupiter framework.Here are some steps to test and use MOCK objects for testing: 1. Add related dependencies First, you need to add Mockito and Junit Jupiter to the project construction file.You can configure in Maven or Gradle, depending on the construction tool you are using.The following is a sample Maven dependency configuration: <dependencies> <dependency> <groupId>org.mockito</groupId> <artifactId>mockito-core</artifactId> <version>3.12.4</version> <scope>test</scope> </dependency> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-api</artifactId> <version>5.8.2</version> <scope>test</scope> </dependency> </dependencies> 2. Create MOCK objects To create an Mock object, you can use the method of `mockito.mock ().This method accepts a class as a parameter and returns a mock object of an instance of that class.The following is an example: import org.junit.jupiter.api.Test; import static org.mockito.Mockito.mock; public class MyTest { @Test public void testMockObject() { // Create Mock objects MyClass myMockObject = mock(MyClass.class); // Use the mock object for testing // ... } } In the above example, we used the `mock ()` method to create a mock object of `MyClass`. 3. Use the Mock object to test After creating the Mock object, you can use it to simulate behavior, verify the call, set the expected value, etc.Here are some common cases of testing using Mockito for testing: import org.junit.jupiter.api.Test; import static org.mockito.Mockito.*; public class MyTest { @Test public void testMockObject() { MyClass myMockObject = mock(MyClass.class); // The return value of the analog method when(myMockObject.getValue()).thenReturn(10); // Verification method calls myMockObject.doSomething(); verify(myMockObject, times(1)).doSomething(); // Verification method call parameters myMockObject.doSomethingWithArgument("test"); verify(myMockObject, times(1)).doSomethingWithArgument(eq("test")); // throw an exception when(myMockObject.someMethod()).thenThrow(new RuntimeException()); assertThrows(RuntimeException.class, () -> myMockObject.someMethod()); } } In the above example, we use Mockito's `when ()` method to simulate the return value of the method, and use the `Verify ()` method to verify the method of the method.We also use the `Thenthrow () method to simulate the method to throw an exception, and use the` AssertthRows () "method to verify the abnormal throwing. Mockito also provides a rich API to simulate the calls of different behaviors and verification methods.You can learn more about Mockito by consulting Mockito's official documents. In summary, the Mockito Junit Jupiter framework is a very powerful and easy -to -use tool for creating and using Mock objects for unit testing.It can help you test those dependent objects that are difficult to obtain or created, and provide rich functions to simulate behavior and verification methods.By using Mockito reasonably, you can write more reliable and maintainable unit tests.