Can you provide an example of mocking a static method with mockStatic()

Example: Mocking a Static Method

Let's say you have a class named `StringCalculatorStatic` with a static method `add()` that you want to mock:

java
public class StringCalculatorStatic {
    public static int add(String numbers) {
        // Implementation to add numbers
        return 0; // Placeholder for actual logic
    }
}

Using Mockito to Mock the Static Method

To mock the `add()` method, you can use the following code in your test class:

java
import org.junit.jupiter.api.Test;
import org.mockito.MockedStatic;
import org.mockito.Mockito;

public class StringCalculatorStaticTest {

    @Test
    void testAdd() {
        try (MockedStatic mockedStatic = Mockito.mockStatic(StringCalculatorStatic.class)) {
            // Configure the mock behavior
            mockedStatic.when(() -> StringCalculatorStatic.add("1,2,3")).thenReturn(7);

            // Call the static method
            int result = StringCalculatorStatic.add("1,2,3");

            // Verify the result
            System.out.println("Result: " + result); // Should print: Result: 7

            // Optionally, verify that the method was called
            mockedStatic.verify(() -> StringCalculatorStatic.add("1,2,3"));
        }
    }
}

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