failure.assertHasCause(cause)
    }

    protected void failureHasCause(Pattern pattern) {
        failure.assertThatCause(matchesRegexp(pattern))
    }

    protected void failureDescriptionStartsWith(String description) {
        failure.assertThatDescription(containsNormalizedString(description))
    }

    protected void failureDescriptionContains(String description) {

        buildFile << taskWithNestedBeanFromCustomClassLoader()

        when:
        fails "customTask"
        then:
        executedAndNotSkipped ":customTask"
        failureDescriptionStartsWith("A problem was found with the configuration of task ':customTask' (type 'TaskWithNestedProperty').")
        failureDescriptionContains(implementationUnknown {
            nestedProperty('bean')