静的メソッドとコンストラクターのモック化

Beyond Regular Mocks

When Traditional Mocks Fail

Powering Up Mockito

Setting Up Your Project

dependencies {
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.10.0'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.10.0'
    testImplementation 'org.mockito:mockito-core:5.8.0' // Includes inline mock maker
    // For older Mockito versions, you might need:
    // testImplementation 'org.mockito:mockito-inline:5.8.0'
}

Mocking Static Helpers

import org.mockito.Mockito;
import org.mockito.MockedStatic;

// Utility class with a static method
class MyStaticService {
    public static String getGreeting() {
        return "Hello from real static service!";
    }
    public static int add(int a, int b) {
        return a + b;
    }
}

public class Main {
    public static void main(String[] args) {
        System.out.println("Before mock: " + MyStaticService.getGreeting());

        // Mock the static method within a try-with-resources
        try (MockedStatic<MyStaticService> mockedStatic = Mockito.mockStatic(MyStaticService.class)) {
            mockedStatic.when(MyStaticService::getGreeting).thenReturn("Hello from mocked static!");
            mockedStatic.when(() -> MyStaticService.add(1, 2)).thenReturn(100);

            System.out.println("During mock (greeting): " + MyStaticService.getGreeting());
            System.out.println("During mock (add): " + MyStaticService.add(1, 2));
            System.out.println("During mock (add other): " + MyStaticService.add(5, 5)); // Not mocked, returns 0 by default

            // Verify calls (typically in a test assertion)
            mockedStatic.verify(MyStaticService::getGreeting);
            mockedStatic.verify(() -> MyStaticService.add(1, 2), Mockito.times(1));

        } // Mock is closed here

        System.out.println("After mock: " + MyStaticService.getGreeting());
    }
}

Checking Static Interactions

import org.mockito.Mockito;
import org.mockito.MockedStatic;

// Class from previous scene
class MyStaticService {
    public static String getGreeting() { return "Hello from real static!"; }
    public static int multiply(int a, int b) { return a * b; }
}

public class Main {
    public static void main(String[] args) {
        // Simulate a scenario where a static method is called
        System.out.println("Initial call: " + MyStaticService.multiply(2, 3));

        try (MockedStatic<MyStaticService> mockedStatic = Mockito.mockStatic(MyStaticService.class)) {
            mockedStatic.when(() -> MyStaticService.multiply(2, 3)).thenReturn(777);
            mockedStatic.when(() -> MyStaticService.multiply(5, 5)).thenReturn(123);

            // Call the static method through the mock
            System.out.println("Mocked call 1: " + MyStaticService.multiply(2, 3));
            System.out.println("Mocked call 2: " + MyStaticService.multiply(5, 5));

            // Verify specific calls
            mockedStatic.verify(() -> MyStaticService.multiply(2, 3), Mockito.times(1));
            mockedStatic.verify(() -> MyStaticService.multiply(5, 5), Mockito.atLeastOnce());
            // Verify that a different call was NOT made
            mockedStatic.verify(() -> MyStaticService.multiply(10, 10), Mockito.never());

            System.out.println("Verifications completed.");

        } // Mock is closed here
    }
}

Taming Final Classes

import org.mockito.Mockito;

// A final class that cannot be extended normally
final class FinalProcessor {
    public final String process(String input) {
        return "Real processed: " + input.toUpperCase();
    }
    public int getVersion() {
        return 1;
    }
}

public class Main {
    public static void main(String[] args) {
        FinalProcessor realProcessor = new FinalProcessor();
        System.out.println("Real output: " + realProcessor.process("data"));
        System.out.println("Real version: " + realProcessor.getVersion());

        // Mocking a final class
        FinalProcessor mockProcessor = Mockito.mock(FinalProcessor.class);

        // Stubbing a final method
        Mockito.when(mockProcessor.process("data")).thenReturn("Mocked processed: data");
        Mockito.when(mockProcessor.getVersion()).thenReturn(99);

        System.out.println("Mocked output: " + mockProcessor.process("data"));
        System.out.println("Mocked version: " + mockProcessor.getVersion());

        // Verify interaction with the mocked final class
        Mockito.verify(mockProcessor).process("data");
    }
}

Intercepting New Objects

import org.mockito.Mockito;
import org.mockito.MockedConstruction;

// A class that creates another object internally
class DependentService {
    private final Helper helper;

    public DependentService() {
        this.helper = new Helper(); // Direct constructor call
    }

    public String doWork() {
        return "Service working with: " + helper.getGreeting();
    }
}

// The class whose constructor we want to mock
class Helper {
    public String getGreeting() {
        return "Real Helper greeting";
    }
}

public class Main {
    public static void main(String[] args) {
        System.out.println("Without mock:");
        DependentService realService = new DependentService();
        System.out.println(realService.doWork());

        System.out.println("\nWith mocked construction:");
        // Mock the constructor of Helper
        try (MockedConstruction<Helper> mockedConstruction = Mockito.mockConstruction(Helper.class,
                (mock, context) -> {
                    // This block runs every time new Helper() is called
                    Mockito.when(mock.getGreeting()).thenReturn("Mocked Helper greeting!");
                    System.out.println("Helper constructor intercepted!");
                })) {

            // When DependentService() is called, it calls new Helper(),
            // which now returns our stubbed mock.
            DependentService serviceWithMockedHelper = new DependentService();
            System.out.println(serviceWithMockedHelper.doWork());

            // You can get all constructed mocks
            Helper constructedMock = mockedConstruction.constructed().get(0);
            Mockito.verify(constructedMock).getGreeting(); // Verify interaction with the mock
            System.out.println("Verified mock interaction.");

        } // MockedConstruction is closed here
    }
}

Use With Care

Advanced Mocking Check

Advanced Mocking Recap