private void assertStandardClassLoaderCannotFindClass(String className) {
   try {
     testObject.findClass(className);
     fail("Should not be able to find this class in standard ClassLoader");
   } catch (Exception e) {
   }
 }
 @Test
 public void ifClassCannotBeFoundAtAllThrowARuntimeExceptionWrappedClassNotFoundException()
     throws Exception {
   try {
     testObject.findClass(testClassName);
     fail("Should have thrown a runtime exception");
   } catch (RuntimeException e) {
   }
 }
  @Test
  public void findClassTriesFilesystemSecond() throws Exception {
    File folderHierarchy = new File(currentDirectory, testPackageName.replace(".", "/"));
    folderHierarchy.mkdirs();

    assertStandardClassLoaderCannotFindClass(testClassName);

    FileUtils.copyFile(testClassFile, new File(folderHierarchy, testFileName));

    Class<?> clazz = testObject.findClass(testClassName);
    assertNotNull(clazz);
  }
  @Test
  public void findClassDoesNotTryToRedefineClassesTwice() throws Exception {
    assertStandardClassLoaderCannotFindClass(testClassName);
    final byte[] loadedClassContent = FileUtils.readFileToByteArray(testClassFile);

    InMemoryClassFile classFileObject =
        new InMemoryClassFile(testClassName) {
          @Override
          public byte[] getBytes() {
            return loadedClassContent;
          };
        };

    testObject.addClass(testClassName, classFileObject);

    testObject.findClass(testClassName);
    testObject.findClass(testClassName);
  }
  @Test
  public void findClassTriesTheHashMapFirst() throws Exception {
    assertStandardClassLoaderCannotFindClass(testClassName);
    final byte[] loadedClassContent = FileUtils.readFileToByteArray(testClassFile);

    InMemoryClassFile classFileObject =
        new InMemoryClassFile(testClassName) {
          @Override
          public byte[] getBytes() {
            return loadedClassContent;
          };
        };

    testObject.addClass(testClassName, classFileObject);

    Class<?> clazz = testObject.findClass(testClassName);
    assertNotNull(clazz);
  }