@Test
public void testIsNotEmpty() {

    final String nullString = null;
    final String emptyString = "";
    final String blankString = " ";
    final String string = "a";
    assertThat(Strings.isNotEmpty(nullString), is(false));
    assertThat(Strings.isNotEmpty(emptyString), is(false));
    assertThat(Strings.isNotEmpty(blankString), is(true));
    assertThat(Strings.isNotEmpty(string), is(true));
}