Spring Boot @SpringBootTest in JUnit - Build an Automation Script

Verify Spring Boot Application Context Loads Successfully

Preconditions (3)

Step 1: Create a test class annotated with @SpringBootTest

Step 2: Write a test method annotated with @Test

Step 3: Run the test to load the full Spring application context

Step 4: Observe if the application context loads without exceptions

✅ Expected Result: The test passes if the Spring application context loads successfully without any exceptions or errors

Automation Requirements - JUnit 5 with Spring Boot Test

Assertions Needed:

Test passes if application context loads without exceptions

Best Practices:

Use @SpringBootTest annotation on the test class to load full context

Use @Test annotation from JUnit Jupiter

Keep the test simple to only verify context loading

Avoid adding unnecessary logic in this test

Use descriptive test method names

Automated Solution

JUnit

package com.example.demo;

import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
public class DemoApplicationTests {

    @Test
    void contextLoads() {
        // This test will pass if the application context loads successfully
    }
}

The test class is annotated with @SpringBootTest to tell Spring Boot to load the full application context for testing.

The test method contextLoads() is annotated with @Test from JUnit Jupiter. It is empty because the test will automatically fail if the context fails to load.

This simple test ensures that the Spring Boot application starts up correctly without any configuration or bean errors.

Common Mistakes - 3 Pitfalls

Not using @SpringBootTest annotation on the test class

Adding logic or assertions inside the contextLoads test method

Using JUnit 4 @Test instead of JUnit 5 @Test

Bonus Challenge

Add a test that verifies a specific Spring bean is loaded in the application context

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