org.gradle.api package is present for plugin but not it's classes?

Question

The closest I could get was the org.gradle.api.plugins class, but there I don't seem to have it's other classes in my classpath?

I've attached an image so people can see what it looks like in intellij, I'd like it to be able to find JvmTestSuite so that I can use it like:

testing {
    suites {
        test(JvmTestSuite) {
            sources {

            }
        }

        integrationTest(JvmTestSuite) {

        }
    }
}