@Test
public void testGetKnownParameter() {

  ParameterDependencyGraph paramDepGrap = new ParameterDependencyGraph();
  LinkedHashMap<String, Set<String>> dependencyGraph = new LinkedHashMap<>();
  dependencyGraph.put( "param1", asSet( "param2", "param3" ) );
  dependencyGraph.put( "param2", asSet( "param3", "param4" ) );
  paramDepGrap.setDependencyGraph( dependencyGraph );
  assertEquals( paramDepGrap.getKnownParameter(), asSet( "param1", "param2" ) );
}