private DeltaFilterCommandLineFunction createRequiredDeltaFilter() {
   DeltaFilterCommandLineFunction instance = new DeltaFilterCommandLineFunction();
   instance.mummerDir = new File("mummer");
   instance.inDelta = new File("in.delta");
   instance.outDelta = new File("out.delta");
   return instance;
 }
 /** Test of commandLine method, of class DeltaFilterCommandLineFunction. */
 @Test
 public void testCommandLine() {
   System.out.println("commandLine");
   DeltaFilterCommandLineFunction instance = createRequiredDeltaFilter();
   String expResult = "'mummer/delta-filter' 'in.delta' > 'out.delta'";
   String result = instance.commandLine();
   assertArrayEquals(expResult.trim().split("\\s+"), result.trim().split("\\s+"));
 }