*/
    @Test
    public void testDefaultString() {
        assertThat(StringUtil.defaultString(null), is(""));
        assertThat(StringUtil.defaultString(""), is(""));
        assertThat(StringUtil.defaultString("aaa"), is("aaa"));
    }

    /**
     *
     */
    @Test
    public void testDefaultStringDefaultStr() {
        assertThat(StringUtil.defaultString(null, "NULL"), is("NULL"));

        final String encrypted1 = cipher1.encryptText(original);
        final String encrypted2 = cipher2.encryptText(original);

        assertThat(encrypted1, is(not(encrypted2)));
        assertThat(cipher1.decryptText(encrypted1), is(original));
        assertThat(cipher2.decryptText(encrypted2), is(original));
    }

    @Test
    public void testEmptyString() {

     */
    @Test
    public void testFileToFile() throws Exception {
        final byte[] bytes = readBytes(inputFile);
        assertThat(bytes, is("あいうえお".getBytes("UTF-8")));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testReadUTF8() throws Exception {
        assertThat(FileUtil.readUTF8(getPath("hoge_utf8.txt")), is("あ"));
    }

    /**
     * Test isPathSafe with safe path
     *