given:
        runner.tasksToRun = ['build']
        runner.warmUpRuns = 39
        runner.runs = 40

        def changedFile = getFileToChange(changeType)
        def changeClosure = getChangeClosure(changeType)
        runner.addBuildMutator { invocationSettings ->
            new BuildMutator() {
                String originalContent
                File originalContentFor

        def problem = createTestProblem()


        when:
        def builder = problem.toBuilder()
        changeClosure.curry(builder).run()
        def newProblem = builder.build()

        then:

        newProblem != problem

        where:
        changedAspect | changeClosure
        "severity"    | { it.severity(Severity.WARNING) }
        "locations"   | { it.fileLocation("file") }

...
}

    @Unroll('Project #buildSize native build #changeType')
    def "build with changes"(String buildSize, String changeType, Amount<Duration> maxExecutionTimeRegression, String changedFile, Closure changeClosure) {
...
        runner.maxExecutionTimeRegression = maxExecutionTimeRegression
        runner.targetVersions = ['2.14']
        runner.useDaemon = true
...
        where: