@Test
public void testGenesToKeep() {

    Set<String> genesToKeep = new LinkedHashSet<>();
    genesToKeep.add("1");
    genesToKeep.add("2");
    genesToKeep.add("3");
    instance = builder.genesToKeep(genesToKeep).build();
    assertThat(instance.getGenesToKeep(), equalTo(genesToKeep));        
}