MaxUnionSizeCheck implements EslintBasedCheck { @Override public List<Object> configurations() { return Collections.singletonList(threshold); }  @Override List<Object> configurations(); @Override String eslintKey();  }
@Test public void configurations() { MaxUnionSizeCheck check = new MaxUnionSizeCheck(); assertThat(check.configurations()).containsExactly(3); check.threshold = 4; assertThat(check.configurations()).containsExactly(4); }