@Test
public void should_get_different_encrypted_text_every_time_for_same_plain_text() {

    String encryptedText1 = EncryptHelper.encrypt(plainText);
    String encryptedText2 = EncryptHelper.encrypt(plainText);
    String encryptedText3 = EncryptHelper.encrypt(plainText);
    assertThat(encryptedText1, not(encryptedText2));
    assertThat(encryptedText1, not(encryptedText3));
    assertThat(encryptedText2, not(encryptedText3));
}