How to mock localdatetime in mockito?

@porter.bins 

To mock LocalDateTime in Mockito, you can use the when method to specify the behavior of the mock object.

Here's an example of how you might do this:

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LocalDateTime mockLocalDateTime = mock(LocalDateTime.class);

when(mockLocalDateTime.now())
  .thenReturn(LocalDateTime.of(2020, 1, 1, 0, 0));

In this example, we create a mock LocalDateTime object and use the when method to specify that the now method should return a LocalDateTime object with a fixed date and time (2020-01-01 00:00).

You can also use the thenThrow method to specify that the mock should throw an exception when the now method is called:

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when(mockLocalDateTime.now())
  .thenThrow(new RuntimeException("Error getting current time"));

This can be useful for testing error handling in your code.

You can read more about mocking with Mockito in the Mockito documentation.

@porter.bins 

In order to mock LocalDateTime in Mockito, you'll need to use PowerMock along with Mockito as LocalDateTime is a final class and cannot be mocked using Mockito alone.

Here's an example of how you can mock LocalDateTime using PowerMock and Mockito:

1. Add the necessary dependencies to your build.gradle or pom.xml file: For Gradle: testImplementation 'org.powermock:powermock-api-mockito2:2.0.9' testImplementation 'org.powermock:powermock-module-junit4:2.0.9' For Maven:
2. Annotate your test class with @RunWith(PowerMockRunner.class): import org.junit.runner.RunWith; import org.powermock.modules.junit4.PowerMockRunner; @RunWith(PowerMockRunner.class) public class YourTestClass { // Your test methods }
3. Use PowerMockito to mock the LocalDateTime class: import static org.mockito.Mockito.when; import org.junit.Test; import org.junit.runner.RunWith; import org.mockito.Mock; import org.powermock.api.mockito.PowerMockito; import org.powermock.core.classloader.annotations.PrepareForTest; import org.powermock.modules.junit4.PowerMockRunner; import java.time.LocalDateTime; @RunWith(PowerMockRunner.class) @PrepareForTest(LocalDateTime.class) public class YourTestClass { @Mock private LocalDateTime mockLocalDateTime; @Test public void yourTestMethod() { PowerMockito.mockStatic(LocalDateTime.class); when(LocalDateTime.now()).thenReturn(mockLocalDateTime); // Rest of your test code } }

In this example, we use PowerMockito to mock the LocalDateTime class, and then use Mockito's when method to specify the behavior of the now method on the mocked LocalDateTime object. You can then use this mocked LocalDateTime object in your test code.

Note: Using PowerMock can have some performance implications and should be used sparingly. It's generally recommended to design your code in a way that allows easy testing without the need for such heavy mocking. If possible, consider refactoring your code to avoid the need for mocking final classes like LocalDateTime.