FrequencyFilter implements VariantFilter { @Override public String toString() { return "FrequencyFilter{" + "maxFreq=" + maxFreq + '}'; } FrequencyFilter(float maxFreq); float getMaxFreq(); @Override FilterType getFilterType(); @Override FilterResult runFilter(VariantEvaluation variantEvaluation); @Override int hashCode(); @Override boolean equals(Object obj); @Override String toString();  }
@Test public void testToString() { System.out.println(instance); assertThat(instance.toString().isEmpty(), is(false)); }