* {@code class.getPackage().getName()} produces a {@code NullPointerException} because {@code
     * class.getPackage()} returns {@code null}.
     */
    public String getPackageName() {
      return Reflection.getPackageName(className);
    }

    /**
     * Returns the simple name of the underlying class as given in the source code.
     *

      // a file.
      String visiblePackage = Reflection.getPackageName(cls);
      ImmutableList.Builder<Method> builder = ImmutableList.builder();
      for (Class<?> type : TypeToken.of(cls).getTypes().rawTypes()) {
        if (!Reflection.getPackageName(type).equals(visiblePackage)) {
          break;
        }
        for (Method method : type.getDeclaredMethods()) {

    }

    public String getClassName() {
        return className;
    }

    public String getSimpleName() {
        return StringUtils.substringAfterLast(className, ".");
    }

    public String getPackageName() {
        return packageName;
    }

    public boolean isInterface() {
        return metaType == MetaType.INTERFACE;
    }

    public boolean isGroovy() {
        return isGroovy;
    }

  }

  public void testGetPackageName() {
    assertEquals(
        "", new ClassInfo(FILE, "Foo.class", getClass().getClassLoader()).getPackageName());
    assertEquals(
        "a.b", new ClassInfo(FILE, "a/b/Foo.class", getClass().getClassLoader()).getPackageName());
  }

  // Test that ResourceInfo.urls() returns identical content to ClassLoader.getResources()


  @AndroidIncompatible

      // a file.
      String visiblePackage = Reflection.getPackageName(cls);
      ImmutableList.Builder<Method> builder = ImmutableList.builder();
      for (Class<?> type : TypeToken.of(cls).getTypes().rawTypes()) {
        if (!Reflection.getPackageName(type).equals(visiblePackage)) {
          break;
        }
        for (Method method : type.getDeclaredMethods()) {

  }

  public void testGetPackageName() {
    assertEquals(
        "", new ClassInfo(FILE, "Foo.class", getClass().getClassLoader()).getPackageName());
    assertEquals(
        "a.b", new ClassInfo(FILE, "a/b/Foo.class", getClass().getClassLoader()).getPackageName());
  }

  // Test that ResourceInfo.urls() returns identical content to ClassLoader.getResources()


  @AndroidIncompatible

      this.declaringClass = declaringClass;
      this.factories = factories;
      this.factoryMethodsDescription = factoryMethodsDescription;
      packagesToTest.add(Reflection.getPackageName(declaringClass));
    }

    /**
     * Specifies that only the methods that are declared to return {@code returnType} or its subtype
     * are tested.
     *
     * @return this tester object
     */

        }
    }

    /**
     * パッケージ名を返します。
     *
     * @param clazz
     *            クラス。{@literal null}であってはいけません
     * @return パッケージ名
     */
    public static String getPackageName(final Class<?> clazz) {
        assertArgumentNotNull("clazz", clazz);

        final String fqcn = clazz.getName();
        final int pos = fqcn.lastIndexOf('.');
        if (pos > 0) {