// "a.b.Foo" -> a.b.Foo.class
    TreeMap<String, Class<?>> classMap = Maps.newTreeMap();
    for (Class<?> cls : classes) {
      classMap.put(cls.getName(), cls);
    }
    // Foo.class -> [FooTest.class, FooTests.class, FooTestSuite.class, ...]
    Multimap<Class<?>, Class<?>> testClasses = HashMultimap.create();
    LinkedHashSet<Class<?>> candidateClasses = Sets.newLinkedHashSet();
    for (Class<?> cls : classes) {

    // "a.b.Foo" -> a.b.Foo.class
    TreeMap<String, Class<?>> classMap = Maps.newTreeMap();
    for (Class<?> cls : classes) {
      classMap.put(cls.getName(), cls);
    }
    // Foo.class -> [FooTest.class, FooTests.class, FooTestSuite.class, ...]
    Multimap<Class<?>, Class<?>> testClasses = HashMultimap.create();
    LinkedHashSet<Class<?>> candidateClasses = Sets.newLinkedHashSet();
    for (Class<?> cls : classes) {

   * semantics of builder can be arbitrarily complex. Still, a factory class can be created in the
   * test to facilitate equality testing. For example:
   *
   * <pre>
   * public class FooTest {
   *
   *   private static class FooFactoryForTest {
   *     public static Foo create(String a, String b, int c, boolean d) {
   *       return Foo.builder()
   *           .setA(a)
   *           .setB(b)