Predicate<String> equalsFoo = Predicates.equalTo("Foo");
    Predicate<String> equalsBar = Predicates.equalTo("Bar");
    Predicate<String> trimEqualsFoo = Predicates.compose(equalsFoo, trim);
    Function<String, String> identity = Functions.identity();

    assertTrue(trimEqualsFoo.apply("Foo"));
    assertTrue(trimEqualsFoo.apply("   Foo   "));
    assertFalse(trimEqualsFoo.apply("Foo-b-que"));

    new EqualsTester()

Então, se você rodar este exemplo e for até <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a>, você verá a seguinte resposta:

```JSON
{"item_id":"foo"}
```

## Parâmetros da rota com tipos

Você pode declarar o tipo de um parâmetro na função usando as anotações padrões do Python:

아래와 같은 URL을 사용합니다:

```
http://localhost:8000/items/?q=foo&q=bar
```

여러 `q` *쿼리 매개변수* 값들을 (`foo` 및 `bar`) 파이썬 `list`로 *경로 작동 함수* 내 *함수 매개변수* `q`로 전달 받습니다.

따라서 해당 URL에 대한 응답은 다음과 같습니다:

```JSON
{
  "q": [
    "foo",
    "bar"
  ]
}
```

/// tip | 팁

  public void testNullIsPassedThrough() {
    Converter<String, String> nullsArePassed = sillyConverter(false);
    assertEquals("forward", nullsArePassed.convert("foo"));
    assertEquals("forward", nullsArePassed.convert(null));
    assertEquals("backward", nullsArePassed.reverse().convert("foo"));
    assertEquals("backward", nullsArePassed.reverse().convert(null));
  }

  public void testNullIsNotPassedThrough() {

    assertThat(expected).hasMessageThat().isEqualTo("foo (-1) must not be negative");
  }

  public void testCheckElementIndex_withDesc_tooHigh() {
    IndexOutOfBoundsException expected =
        assertThrows(IndexOutOfBoundsException.class, () -> checkElementIndex(1, 1, "foo"));
    assertThat(expected).hasMessageThat().isEqualTo("foo (1) must be less than size (1)");
  }

    assertThat(expected).hasMessageThat().isEqualTo("foo (-1) must not be negative");
  }

  public void testCheckElementIndex_withDesc_tooHigh() {
    IndexOutOfBoundsException expected =
        assertThrows(IndexOutOfBoundsException.class, () -> checkElementIndex(1, 1, "foo"));
    assertThat(expected).hasMessageThat().isEqualTo("foo (1) must be less than size (1)");
  }

    val requestWithoutCache = Request.Builder().url("http://localhost/api").build()
    val builtRequestWithoutCache = requestWithoutCache.newBuilder().url("http://localhost/api/foo").build()
    assertThat(builtRequestWithoutCache.url).isEqualTo(
      "http://localhost/api/foo".toHttpUrl(),
    )
    val requestWithCache =
      Request
        .Builder()
        .url("http://localhost/api")
        .build()
    // cache url object

        URL rel = new URL(base, "foo/bar", handler);

        // Assert
        assertEquals(SmbConstants.DEFAULT_PORT, rel.getPort(), "Default port should be applied");
        String actualPath = rel.getPath();
        assertNotNull(actualPath, "Path should not be null");
        // Based on the test output, the actual path is "/bar" when parsing relative spec "foo/bar"

    Funnel<Iterable<?>> sequential = Funnels.sequentialFunnel(elementFunnel);
    sequential.funnel(Arrays.asList("foo", "bar", "baz", "quux"), primitiveSink);
    InOrder inOrder = inOrder(elementFunnel);
    inOrder.verify(elementFunnel).funnel("foo", primitiveSink);
    inOrder.verify(elementFunnel).funnel("bar", primitiveSink);
    inOrder.verify(elementFunnel).funnel("baz", primitiveSink);

      val urlPath = url.encodedPath

      if (urlPath == path) {
        return true // As in '/foo' matching '/foo'.
      }

      if (urlPath.startsWith(path)) {
        if (path.endsWith("/")) return true // As in '/' matching '/foo'.
        if (urlPath[path.length] == '/') return true // As in '/foo' matching '/foo/bar'.
      }

      return false
    }

    /**