@Test
public void testParseAnalysisStepFrequencyFilterNoFrequencySourcesDefined() {

    String script = "analysis:\n"
            + "    vcf: test.vcf\n"
            + "    frequencySources: []\n"
            + "    steps: ["
            + "        frequencyFilter: {maxFrequency: 1.0}\n"
            + "]";
    assertThrows(AnalysisParserException.class, () ->
            instance.parseAnalysis(script)
    );
}