Failure trying to write tests using jenkins-test-harness
To include the war file is not the right way, if you like to test something. Just think about how should the correct lib be found inside that folders...
Just add the concrete dependency for that:
<dependency> <groupId>org.jenkins-ci.main</groupId> <artifactId>jenkins-core</artifactId> <version>2.110</version> <scope>provided</scope></dependency>
Also why you added the parent? My suggestion: Just only include stuff, that you really need...