@Test
public void testCapitaliseFirstLetter() {

    assertThat(Strings.capitaliseFirstLetter(""), is(""));
    assertThat(Strings.capitaliseFirstLetter("a"), is("A"));
    assertThat(Strings.capitaliseFirstLetter("aa"), is("Aa"));
    assertThat(Strings.capitaliseFirstLetter("A"), is("A"));
    assertThat(Strings.capitaliseFirstLetter("Ab"), is("Ab"));
}