@Test
public void count_char_matches() {
assertThat(Strings.countMatches("123456789", '0')).isZero();
assertThat(Strings.countMatches("123456789", '1')).isEqualTo(1);
assertThat(Strings.countMatches("111111111", '1')).isEqualTo(9);
}
@Test
public void count_char_matches() {
assertThat(Strings.countMatches("123456789", '0')).isZero();
assertThat(Strings.countMatches("123456789", '1')).isEqualTo(1);
assertThat(Strings.countMatches("111111111", '1')).isEqualTo(9);
}