when:
        renderer.addProperty("prop", new RenderFailedValue())

        then:
        assert containsLine(out.toString(), 'prop: ' +
            'class org.gradle.api.tasks.diagnostics.internal.PropertyReportRendererTest$RenderFailedValue ' +
            '[Rendering failed]')
    }

    private static class RenderFailedValue {
        @Override
        String toString() {