// by looking for `// begin-report-data` and `// end-report-data`
        def jsonText = linesBetween(reportFile, '// begin-report-data', '// end-report-data')
        assert jsonText: "malformed report file"
        new JsonSlurper().parseText(jsonText) as Map<String, Object>
    }

    private static String linesBetween(File file, String beginLine, String endLine) {
        return file.withReader('utf-8') { reader ->