@Test
public void testMatchingTagKeyValueDoesMatch() {

    Map<String,String> itemtags = new HashMap<String,String>() {{
        put("one","two");
    }};
    TagFilter tf = new TagFilter("one");
    TagFilter.Result result = tf.matches(itemtags);
    assertThat(result.matched()).isTrue();
    Map<String,String> itemtags2 = new HashMap<String,String>() {{
        put("one",null);
    }};
    assertThat(tf.matches(itemtags2).matched()).isTrue();
}