Создайте функцию, название которой должно начинаться с `test_` (это стандарт из соглашений `pytest`).

Используйте объект `TestClient` так же, как Вы используете `httpx`.

Напишите простое утверждение с `assert` дабы проверить истинность Python-выражения (это тоже стандарт `pytest`).

```Python hl_lines="2  12  15-18"
{!../../docs_src/app_testing/tutorial001.py!}
```

/// tip | "Подсказка"

import static com.google.common.collect.Sets.newHashSet;
import static java.lang.reflect.Modifier.isPublic;
import static java.lang.reflect.Modifier.isStatic;
import static java.util.Arrays.asList;
import static org.junit.Assert.assertThrows;

import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.base.Objects;
import java.lang.reflect.Method;
import java.lang.reflect.Type;

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.reflect;

import static org.junit.Assert.assertThrows;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Map;
import junit.framework.TestCase;

/**

 * the License.
 */

package com.google.common.collect;

import static com.google.common.collect.BoundType.OPEN;
import static com.google.common.collect.Maps.immutableEntry;
import static org.junit.Assert.assertThrows;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.testing.CollectorTester;
import com.google.common.testing.SerializableTester;
import java.util.Map.Entry;

import static com.google.common.collect.Sets.newHashSet;
import static java.lang.reflect.Modifier.isPublic;
import static java.lang.reflect.Modifier.isStatic;
import static java.util.Arrays.asList;
import static org.junit.Assert.assertThrows;

import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.base.Objects;
import java.lang.reflect.Method;
import java.lang.reflect.Type;

  }

  public void testNullCloseable() throws IOException {
    Closer closer = Closer.create();
    closer.register(null);
    closer.close();
  }

  /**
   * Asserts that an exception was thrown when trying to close each of the given throwables and that
   * each such exception was suppressed because of the given thrown exception.
   */

import static com.google.common.collect.MapMakerInternalMap.Strength.WEAK;
import static com.google.common.testing.SerializableTester.reserializeAndAssert;
import static java.util.Arrays.asList;
import static org.junit.Assert.assertThrows;
import static org.mockito.ArgumentMatchers.isA;
import static org.mockito.Mockito.eq;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

      of any other Contributor, and only if You agree to indemnify,
      defend, and hold each Contributor harmless for any liability
      incurred by, or claims asserted against, such Contributor by reason
      of your accepting any such warranty or additional liability.

   END OF TERMS AND CONDITIONS

   Copyright 2014 Docker, Inc.

      of any other Contributor, and only if You agree to indemnify,
      defend, and hold each Contributor harmless for any liability
      incurred by, or claims asserted against, such Contributor by reason
      of your accepting any such warranty or additional liability.

   END OF TERMS AND CONDITIONS

   Copyright 2020 Red Hat, Inc.

      of any other Contributor, and only if You agree to indemnify,
      defend, and hold each Contributor harmless for any liability
      incurred by, or claims asserted against, such Contributor by reason
      of your accepting any such warranty or additional liability.

   END OF TERMS AND CONDITIONS

   Copyright 2014 Vishvananda Ishaya.
   Copyright 2014 Docker, Inc.