/** Test of setExtractPattern method, of class PackageClassPreloader. */
 @Test
 public void testSetExtractPattern() {
   PackageClassPreloader loader = newConcrete();
   loader.setExtractPattern(Arrays.asList("a", "b", "b", "c"));
   assertThat(loader.getExtractPattern(), is(containsInAnyOrder("a", "b", "c")));
 }
 /** Test of getExtractPattern method, of class PackageClassPreloader. */
 @Test
 public void testGetExtractPattern() {
   PackageClassPreloader instance = newConcrete();
   assertThat(instance.getExtractPattern(), is(empty()));
 }