Spring Boot 2 2 Error TestEngine junit-vintage Test Discovery Failed

Error “TestEngine with ID ‘junit-vintage’ failed to discover tests” with Spring Boot 2.2

Introduction:

This error typically occurs when using Spring Boot 2.2 and the JUnit 4 test framework with the ‘junit-vintage’ engine.

Overview:

The issue arises from a compatibility problem between Spring Boot 2.2 and the JUnit 4 framework when trying to run tests using the ‘junit-vintage’ engine.

Problem:

The ‘TestEngine with ID ‘junit-vintage’ failed to discover tests’ error message is displayed when attempting to execute JUnit 4 tests in Spring Boot 2.2.

Solution:

To resolve this error, consider upgrading your tests to JUnit 5 or modifying the test configuration to work with JUnit 4 in Spring Boot 2.2. Alternatively, you can also try excluding the ‘junit-vintage’ engine from the test environment to prevent this error from occurring.

Key points to address:

– Check the version compatibility of JUnit Vintage with Spring Boot 2.2
– Verify that the necessary dependencies for JUnit Vintage are correctly configured in the Spring Boot project
– Ensure that the test classes are annotated properly and follow the correct package structure
– Check for any configuration issues or conflicts in the testing setup
– Look for any specific error messages or stack traces that could provide more insight into the root cause of the issue

– TestEngine with ID ‘junit-vintage’ failed to discover tests

Explain the Core Concept:

This error message typically occurs in Spring Boot 2.2 when there is a compatibility issue with the JUnit version being used.

The junit-vintage TestEngine is used to run JUnit 4 tests in JUnit 5. When this error occurs, it means that Spring Boot is not able to discover any tests using the vintage engine, which could be due to a mismatch in versions or misconfiguration.

Different Solutions with code samples:

1. Update the dependencies in your `pom.xml` to use newer versions of JUnit and Spring Boot:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <version>2.2.5.RELEASE</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.junit.vintage</groupId>
    <artifactId>junit-vintage-engine</artifactId>
</dependency>

2. You can also exclude the vintage engine from the tests by adding the following exclusions to your `@SpringBootTest` annotation:

@SpringBootTest(exclude = {JupiterEngine.class})

Conclusion:

Updating the dependencies to newer versions and excluding the vintage engine from the tests should resolve the error “TestEngine with ID ‘junit-vintage’ failed to discover tests” in Spring Boot 2.2.

Kamal