assertEquals("FOO_BAR", UPPER_UNDERSCORE.to(UPPER_UNDERSCORE, "FOO_BAR"));
  }

  public void testConverterToForward() {
    assertEquals("FooBar", UPPER_UNDERSCORE.converterTo(UPPER_CAMEL).convert("FOO_BAR"));
    assertEquals("fooBar", UPPER_UNDERSCORE.converterTo(LOWER_CAMEL).convert("FOO_BAR"));
    assertEquals("FOO_BAR", UPPER_CAMEL.converterTo(UPPER_UNDERSCORE).convert("FooBar"));

  }

  public void testFindClassesToTest_ignoreUnderscores() {
    assertThat(findClassesToTest(ImmutableList.of(Foo.class, Foo_Bar.class)))
        .containsExactly(Foo.class, Foo_Bar.class);
    sanityTests.ignoreClasses(AbstractPackageSanityTests.UNDERSCORE_IN_NAME);
    assertThat(findClassesToTest(ImmutableList.of(Foo.class, Foo_Bar.class)))
        .containsExactly(Foo.class);
  }

  }

  public void testFindClassesToTest_ignoreUnderscores() {
    assertThat(findClassesToTest(ImmutableList.of(Foo.class, Foo_Bar.class)))
        .containsExactly(Foo.class, Foo_Bar.class);
    sanityTests.ignoreClasses(AbstractPackageSanityTests.UNDERSCORE_IN_NAME);
    assertThat(findClassesToTest(ImmutableList.of(Foo.class, Foo_Bar.class)))
        .containsExactly(Foo.class);
  }