AliasMap { public boolean containsKey(String key) { return aliases.containsKey(key) || params.containsKey(key); }  String putAlias(String alias, String key); String get(String key); String put(String key, String value); Map<String, String> toMap(); boolean containsAllKeys(Collection<String> keys); boolean containsKey(String key);  }
@Test public void testContainsKey() throws Exception { AliasMap aliasMap = new AliasMap(); Assertions.assertThat(aliasMap.containsKey("foo")).isFalse(); Assertions.assertThat(aliasMap.containsAllKeys(Lists.newArrayList("foo", "bar"))).isFalse(); }