Mockito anyBoolean Method

The anyBoolean method in the Mockito framework is part of the ArgumentMatchers class. It is used to match any boolean value (either true or false) or non-null Boolean objects as an argument in mocked methods. This is particularly useful when you do not care about the specific boolean value being passed as an argument in a method call.

Table of Contents

1. Introduction
2. anyBoolean Method Syntax
3. Examples
   • Basic Usage
   • Using anyBoolean in Different Scenarios
4. Real-World Use Case
5. Conclusion

Introduction

Mockito is a popular library in Java for creating and managing mock objects. The anyBoolean method, which belongs to the ArgumentMatchers class, allows you to specify that any boolean value (including true and false) or non-null Boolean should match an argument in a mocked method. This can be useful for simplifying tests where the specific boolean value of an argument is not important.

anyBoolean Method Syntax

Matching Any Boolean Value

import org.mockito.ArgumentMatchers;

static boolean anyBoolean()

Matches any boolean or non-null Boolean.

Returns:

• A boolean value that matches any boolean argument.

Examples

Basic Usage

Use anyBoolean to match any boolean argument in a mocked method call.

import static org.mockito.Mockito.*;
import org.mockito.ArgumentMatchers;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;

public class BasicAnyBooleanTest {
    @Test
    void testAnyBoolean() {
        UserService mockUserService = mock(UserService.class);

        // Stub the method to return a specific value
        when(mockUserService.isUserActive(ArgumentMatchers.anyBoolean())).thenReturn("User is active");

        // Call the method with different boolean arguments
        String active1 = mockUserService.isUserActive(true);
        String active2 = mockUserService.isUserActive(false);

        // Verify the results
        assertEquals("User is active", active1);
        assertEquals("User is active", active2);
    }
}

class UserService {
    public String isUserActive(boolean isActive) {
        return isActive ? "User is active" : "User is inactive";
    }
}

Using anyBoolean in Different Scenarios

Use anyBoolean to match boolean arguments in methods with multiple parameters.

import static org.mockito.Mockito.*;
import org.mockito.ArgumentMatchers;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;

public class AnyBooleanWithMultipleParametersTest {
    @Test
    void testAnyBooleanWithMultipleParameters() {
        NotificationService mockNotificationService = mock(NotificationService.class);

        // Stub the method to return specific values
        when(mockNotificationService.sendNotification(ArgumentMatchers.anyString(), ArgumentMatchers.anyBoolean())).thenReturn("Notification sent");

        // Call the method with different arguments
        String result1 = mockNotificationService.sendNotification("Welcome", true);
        String result2 = mockNotificationService.sendNotification("Goodbye", false);

        // Verify the results
        assertEquals("Notification sent", result1);
        assertEquals("Notification sent", result2);
    }
}

interface NotificationService {
    String sendNotification(String message, boolean isUrgent);
}

Real-World Use Case

Simplifying Tests for Services with Boolean Parameters

In a real-world scenario, you might need to test services with methods that take boolean parameters. Using anyBoolean can simplify these tests by allowing you to focus on the behavior you are testing rather than the specific boolean values of the arguments.

import static org.mockito.Mockito.*;
import org.mockito.ArgumentMatchers;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;

interface AuthService {
    void authenticate(String username, boolean rememberMe);
}

class LoginService {
    private final AuthService authService;

    public LoginService(AuthService authService) {
        this.authService = authService;
    }

    public void login(String username, boolean rememberMe) {
        // Login logic
        authService.authenticate(username, rememberMe);
    }
}

public class LoginServiceTest {
    @Test
    void testLogin() {
        AuthService mockAuthService = mock(AuthService.class);
        LoginService loginService = new LoginService(mockAuthService);

        // Call the method
        loginService.login("user123", true);
        loginService.login("user123", false);

        // Verify the interaction
        verify(mockAuthService, times(2)).authenticate(eq("user123"), ArgumentMatchers.anyBoolean());
    }
}

In this example, the LoginServiceTest class uses Mockito’s anyBoolean method to match any boolean argument for the authenticate method. This simplifies the test by allowing you to verify the interaction without specifying exact boolean values for the method’s parameters.

Conclusion

The anyBoolean method in Mockito is used for matching any boolean value as an argument in mocked method calls. By using anyBoolean, you can simplify your tests and focus on the behavior you are testing, rather than the specific boolean values of the arguments. This helps ensure that your tests are flexible, comprehensive, and easy to maintain.