How to Create a Base Test Class in Java

 ✅ Step-by-Step: Creating a Base Test Class in Java

🔹 1. Choose Your Testing Framework

We’ll use JUnit 5 (org.junit.jupiter) in this example. If you're using JUnit 4, let me know — it's slightly different.

🔹 2. Create the Base Test Class

java

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import org.junit.jupiter.api.BeforeEach;

import org.junit.jupiter.api.AfterEach;

public abstract class BaseTest {

    @BeforeEach

    public void setUp() {

        System.out.println("Base setup logic before each test...");

        // e.g., initialize shared resources, mock data, etc.

    }

    @AfterEach

    public void tearDown() {

        System.out.println("Base teardown logic after each test...");

        // e.g., clean up resources

    }

    // You can add shared helper methods here

    protected void log(String message) {

        System.out.println("LOG: " + message);

    }

}

🔹 3. Extend the Base Class in Child Test Classes

java

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import org.junit.jupiter.api.Test;

public class MyFeatureTest extends BaseTest {

    @Test

    public void testSomething() {

        log("Running testSomething");

        // actual test logic

    }

    @Test

    public void testAnotherThing() {

        log("Running testAnotherThing");

        // actual test logic

    }

}

🔹 4. Optional: Add Common Mocks or Test Data

You can initialize mocks (e.g., with Mockito) or test data in the base class:

java

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import org.mockito.MockitoAnnotations;

public abstract class BaseTest {

    @BeforeEach

    public void setUp() {

        MockitoAnnotations.openMocks(this);

        System.out.println("Mocks initialized");

    }

}

📝 Notes

Use @BeforeEach and @AfterEach for test-level setup/teardown.

Use @BeforeAll and @AfterAll (with static methods) for class-level setup.

Mark the base class as abstract to avoid it being picked up as a test class.

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