TestDataGenerator.BackgroundColor.ofConfidence([0, 70]) == null
        TestDataGenerator.BackgroundColor.ofConfidence([0, 60]) == null
        TestDataGenerator.BackgroundColor.ofConfidence([0, 0]) == null
        TestDataGenerator.BackgroundColor.ofConfidence([0, -40]) == null
        TestDataGenerator.BackgroundColor.ofConfidence([0, -50]) == null

        }

        public List<String> getCommits() {
            return commits;
        }
    }

    static class BackgroundColor {
        private static final int THRESHOLD = 80;
        private Map xaxis;
        private String color;

        static BackgroundColor ofConfidence(List<Number> xy) {
            double index = xy.get(0).doubleValue();