assertThat(findClassesToTest(ImmutableList.of(PublicFoo.class))).isEmpty();
    assertThat(findClassesToTest(ImmutableList.of(Foo.class))).contains(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);