final Method hashCodeMethod = ClassUtil.getMethod(getClass(), "hashCode");
        assertThat(MethodUtil.isHashCodeMethod(hashCodeMethod), is(true));
        final Method equalsMethod = ClassUtil.getMethod(getClass(), "equals", Object.class);
        assertThat(MethodUtil.isHashCodeMethod(equalsMethod), is(not(true)));
    }

    /**
     *
     */
    @Test
    public void testIsToStringMethod() {

     * {@literal hashCode()}メソッドかどうか返します。
     *
     * @param method
     *            メソッド。{@literal null}であってはいけません
     * @return {@literal hashCode()}メソッドなら{@literal true}
     */
    public static boolean isHashCodeMethod(final Method method) {
        assertArgumentNotNull("method", method);

        return method != null && method.getName().equals("hashCode") && method.getReturnType() == int.class