No runnable methods running as dependency

[ALekseiMokhov]

Good day! Got stuck with running liquibase-test-harness in our app. All the time we face the same error:

"org.junit.runners.model.InvalidTestClassError: Invalid test class 'liquibase.harness.data.ChangeDataTests':

1. No runnable methods

at org.junit.runners.ParentRunner.validate(ParentRunner.java:525)
at org.junit.runners.ParentRunner.<init>(ParentRunner.java:102)
at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:84).." - for all three test classes (minding we extend BaseHarnessSuite).

Our related dependencies:

    <dependency>
        <groupId>org.liquibase</groupId>
        <artifactId>liquibase-test-harness</artifactId>
        <version>1.0.3</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.spockframework</groupId>
        <artifactId>spock-core</artifactId>
        <version>2.1-groovy-3.0</version>
        <scope>test</scope>
    </dependency>
    <dependency> <!-- enables mocking of classes (in addition to interfaces) -->
        <groupId>cglib</groupId>
        <artifactId>cglib-nodep</artifactId>
        <version>3.3.0</version>
        <scope>test</scope>
    </dependency>
    <dependency> <!-- enables mocking of classes without default constructor (together with CGLIB) -->
        <groupId>org.objenesis</groupId>
        <artifactId>objenesis</artifactId>
        <version>3.2</version>
        <scope>test</scope>
    </dependency>

I followed README and README.extensions.md trying to configure it.

[KushnirykOleh]

Hi @ALekseiMokhov.
One of issues might be that in test-harness we use spock-core version 1.3-groovy-2.5 and major groovy (and spock) versions are not compatible.
Another thing is harness-config.yml with connection details for your DB might be missing in src\test\resources. Or name of the DB doesn't match with folder names where changesets are present by pattern src/test/resources/liquibase/harness/change/changelogs/{DBname}/{testchangeset}.xml.
Those are few on the top of my head. Also i found that IDEs like Eclipse and Intellij IDEA can recognize and run tests right away, but for command line run it may require more complex configuration of surefire and/or failsafe plugins to recognize and run spock tests

[KushnirykOleh]

https://github.com/liquibase/liquibase-cassandra can be used as an example how to run test-harness tests from other app in terminal.
https://github.com/liquibase/liquibase-cassandra/blob/main/README.test-harness.md has details how to run tests with local docker container. It is a bit outdated as it uses teest-harness 1.0.2, but for 1.0.4 only two additional dependencies are needed - jsonassert and snakeyaml