Error "TestEngine with ID 'junit-vintage' failed to discover tests" with Spring Boot 2.2

Question

I have a simple app using Spring Boot and Junit 5:

• When using Spring Boot 2.1 (e.g, 2.1.8 or 2.1.12), my unit tests run smoothly

• When using Spring Boot 2.2 (e.g., 2.2.2.RELEASE or 2.3.2.RELEASE) my unit tests fail with error message

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.22.2:test (default-test) on project XXX: There are test failures.
[ERROR]
[ERROR] Please refer to D:\Projets\workspace\XXX\target\surefire-reports for the individual test results.
[ERROR] Please refer to dump files (if any exist) [date].dump, [date]-jvmRun[N].dump and [date].dumpstream.
[ERROR] There was an error in the forked process
[ERROR] TestEngine with ID 'junit-vintage' failed to discover tests
[ERROR] org.apache.maven.surefire.booter.SurefireBooterForkException: There was an error in the forked process
[ERROR] TestEngine with ID 'junit-vintage' failed to discover tests
[ERROR]         at org.apache.maven.plugin.surefire.booterclient.ForkStarter.fork(ForkStarter.java:656)

I am using Maven 3.6.1, JDK 1.8, JUnit 5.6.0 and JUnit platform 1.6.0. I exclude the dependency on junit:junit from spring-boot-starter-test, so that I have no JUnit 4 artifacts left in the dependency tree. Note that both Spring Boot 2.2 and 2.3 use maven-surefire-plugin 2.22.2, so my problem does not originate from any regression of the maven-surefire-plugin.

Should I stick to Spring Boot 2.1 in order to have my unit test working?

Thanks in advance for your help.

Answer 1

I found the error. The dependency on spring-boot-starter-test brings a dependency on junit-vintage-engine. The latter must be excluded:

<dependency>     <groupId>org.springframework.boot</groupId>     <artifactId>spring-boot-starter-test</artifactId>     <scope>test</scope>     <exclusions>         <exclusion>             <groupId>org.junit.vintage</groupId>             <artifactId>junit-vintage-engine</artifactId>         </exclusion>     </exclusions> </dependency> 

Answer 2

Adding the following dependency explicitly to upgrade junit-vintage-engine resolves the issue:

<dependency>     <groupId>org.junit.vintage</groupId>     <artifactId>junit-vintage-engine</artifactId>     <version>5.7.0</version> </dependency> 

Answer 3

In my case (GRADLE and Spring Boot 2.x.x), adding exclusion for vintage worked

configurations {
    all {
        exclude(group = "junit", module = "junit")
        exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
    }
}