@Test
public void emptiness() throws Exception {
assertThat(isNullOrEmpty((String) null)).isTrue();
assertThat(isNullOrEmpty("")).isTrue();
assertThat(isNullOrEmpty(" ")).isTrue();
assertThat(isNullOrEmpty(" a ")).isFalse();
assertThat(isNullOrEmpty("a")).isFalse();
assertThat(isNullOrEmpty((Map) null)).isTrue();
Map<String, Object> map = new LinkedHashMap<>(20);
assertThat(isNullOrEmpty(map)).isTrue();
map.put("foo", "bar");
assertThat(isNullOrEmpty(map)).isFalse();
map.clear();
assertThat(isNullOrEmpty(map)).isTrue();
assertThat(isNullOrEmpty((Collection) null)).isTrue();
Collection<String> collection = new ArrayList<>();
assertThat(isNullOrEmpty(collection)).isTrue();
collection.add("foo");
assertThat(isNullOrEmpty(collection)).isFalse();
collection.clear();
assertThat(isNullOrEmpty(collection)).isTrue();
}
