return !isBlank(str);
    }

    /**
     * charを含んでいるかどうか返します。
     *
     * @param str
     *            文字列
     * @param ch
     *            char
     * @return charを含んでいるかどうか
     */
    public static boolean contains(final String str, final char ch) {
        if (isEmpty(str)) {
            return false;
        }

    assertEquals(Arrays.asList(4, 5), multimap.get("bar"));
    assertEquals(6, multimap.size());
  }

  public void testBuilderPutAllMultimapWithDuplicates() {
    Multimap<String, Integer> toPut = LinkedListMultimap.create();
    toPut.put("foo", 1);
    toPut.put("bar", 4);
    toPut.put("foo", 2);
    toPut.put("foo", 1);
    toPut.put("bar", 5);

        ("/default?foo=bar", 200, {"foo": "bar"}),
        ("/required?foo=bar", 200, {"foo": "bar"}),
        ("/required", 422, foo_is_missing),
        ("/required?foo=", 422, foo_is_short),
        ("/multiple?foo=bar", 200, {"foo": "bar"}),
        ("/multiple", 422, foo_is_missing),
        ("/multiple?foo=", 422, foo_is_short),
        ("/unrelated?foo=bar", 200, {"foo": "bar"}),
        ("/unrelated", 422, foo_is_missing),

    builder.putAll("foo", Arrays.asList(1, 2, 3));
    builder.putAll("bar", Arrays.asList(4, 5));
    builder.putAll("foo", Arrays.asList(6, 7));
    Multimap<String, Integer> multimap = builder.build();
    assertEquals(ImmutableSet.of(1, 2, 3, 6, 7), multimap.get("foo"));
    assertEquals(ImmutableSet.of(4, 5), multimap.get("bar"));
    assertEquals(7, multimap.size());
  }

    builder.putAll("foo", Arrays.asList(1, 2, 3));
    builder.putAll("bar", Arrays.asList(4, 5));
    builder.putAll("foo", Arrays.asList(6, 7));
    Multimap<String, Integer> multimap = builder.build();
    assertEquals(ImmutableSet.of(1, 2, 3, 6, 7), multimap.get("foo"));
    assertEquals(ImmutableSet.of(4, 5), multimap.get("bar"));
    assertEquals(7, multimap.size());
  }

    assertTrue(set.isEmpty());
    set.add(new DerivedComparable("foo"), 2);
    set.add(new DerivedComparable("bar"), 3);
    assertThat(set)
        .containsExactly(
            new DerivedComparable("bar"),
            new DerivedComparable("bar"),
            new DerivedComparable("bar"),
            new DerivedComparable("foo"),
            new DerivedComparable("foo"))
        .inOrder();
  }

    assertEquals(3, multimap.size());
    assertTrue(multimap.containsKey("bar"));
    assertEquals(Collections.singleton(2), multimap.removeAll("bar"));
    assertEquals(2, multimap.size());
    assertFalse(multimap.containsKey("bar"));
  }

  public void testForMapAsMap() {
    Map<String, Integer> map = Maps.newHashMap();
    map.put("foo", 1);
    map.put("bar", 2);

    assertEquals(3, multimap.size());
    assertTrue(multimap.containsKey("bar"));
    assertEquals(Collections.singleton(2), multimap.removeAll("bar"));
    assertEquals(2, multimap.size());
    assertFalse(multimap.containsKey("bar"));
  }

  public void testForMapAsMap() {
    Map<String, Integer> map = Maps.newHashMap();
    map.put("foo", 1);
    map.put("bar", 2);

    assertTrue(set.isEmpty());
    set.add(new DerivedComparable("foo"), 2);
    set.add(new DerivedComparable("bar"), 3);
    assertThat(set)
        .containsExactly(
            new DerivedComparable("bar"),
            new DerivedComparable("bar"),
            new DerivedComparable("bar"),
            new DerivedComparable("foo"),
            new DerivedComparable("foo"))
        .inOrder();
  }

    response = client.get("/query/optional")
    assert response.status_code == 200
    assert response.json() == "foo bar"


def test_query_optional_query_baz():
    response = client.get("/query/optional?query=baz")
    assert response.status_code == 200
    assert response.json() == "foo bar baz"


def test_query_optional_not_declared_baz():
    response = client.get("/query/optional?not_declared=baz")