@Test
public void doNotEscapeNormalCharactersBeforeBackslash() {

    final int start = 0x0020; // ' '
    final int end = 0x00FFFF;
    IntStream.range(start, end)
            .filter(i -> i != '"' && i != '\\')
            .forEach(character -> {
                final String notEscaped = underTest.apply(character);
                assertThat(notEscaped)
                        .isNull();
            });
}