Steps to reproduce:

• import Grails-based project into IntelliJ IDEA
• add Clover Grails plugin to the project
• run forked tests from IDEA

Build fails with an error like:

| Error Error running forked test-app: No such property: testNames for class: _Events (Use --stacktrace to see the full trace)
| Error Forked Grails VM exited with error

Workaround:

• disable forked test execution in IDEA

Probable cause:

IDEA does not call "grails test-app" but executes the GrailsScriptRunner, e.g.:

java -cp ... org.codehaus.groovy.grails.cli.support.GrailsStarter --main org.codehaus.groovy.grails.cli.GrailsScriptRunner

The most probably this runner does not import the _GrailsTest.groovy, which contains a definition of the testNames property.