Mockito: Dealing with Non-Null Parameters that are Null
When using Mockito, if a non-null parameter is specified but passed as null during a method call, by default Mockito will throw a NullPointerException. This behavior can be modified by using certain Mockito methods.
One way to handle this situation is to use the Optional
class. This class is part of the Java 8 libraries and provides a way to represent an optional value. Here’s an example:
public String processString(Optional<String> input) {
if (input.isPresent()) {
// Process the input string
return "Processed: " + input.get();
} else {
// Handle the null case
return "Input is null";
}
}
With this approach, you can pass the parameter as an Optional
and check for its presence using the isPresent()
method. If the input is present, you can perform the desired operations using the get()
method. Otherwise, you can handle the null case appropriately.
To mock this method using Mockito, you can use the Optional
class as well. Here’s an example:
// Create a mock instance
MyService myService = Mockito.mock(MyService.class);
// Create the expected return value
Optional<String> expectedOutput = Optional.of("Expected Output");
// Set up the mock behavior
Mockito.when(myService.processString(Mockito.any())).thenReturn(expectedOutput);
// Perform the method call
Optional<String> actualOutput = myService.processString(Optional.empty());
// Verify the expected behavior
Assert.assertEquals(expectedOutput, actualOutput);
In this example, we create a mock instance of the MyService
class using Mockito. We then define the expected return value as an Optional
instance. To set up the mock behavior, we use Mockito.when
and specify any input parameter using Mockito.any()
. Finally, we call the method with an empty Optional
as the parameter, and verify that the actual output matches the expected output.
By using Optional
and Mockito, you can easily handle non-null parameters that are passed as null, and define the desired behavior for your mocked methods.
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