assertTrue("HTML report HTML file not found in '$reportDir'", htmlFile.isFile())
        Map<String, Object> jsModel = readJsModelFrom(htmlFile)
        jsModel
    }

    private static Map<String, Object> readJsModelFrom(File reportFile) {
        // ConfigurationCacheReport ensures the pure json model can be read
        // by looking for `// begin-report-data` and `// end-report-data`