assertThat(cache.asMap().keySet()).containsExactly(2, 4);

    CacheTesting.processPendingNotifications(cache);
    assertThat(removalListener.getCount()).isEqualTo(1);

    // 5 won't be cached, won't dump cache
    assertThat(cache.getUnchecked(5)).isEqualTo(5);
    assertThat(cache.asMap().keySet()).containsExactly(2, 4);

    CacheTesting.processPendingNotifications(cache);

 * annotations even on JUnit 3 tests.
 *
 * TODO(b/225350400): Remove @Ignore, which doesn't seem like it should be necessary and probably
 * soon won't be.
 */
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
@Ignore
public final class MyTester extends AbstractTester<@Nullable Void> {
  static int timesTestClassWasRun = 0;

  public void testNothing() {

!!! tip
    `JSONResponse` itself is a sub-class of `Response`.

And when you return a `Response`, **FastAPI** will pass it directly.

It won't do any data conversion with Pydantic models, it won't convert the contents to any type, etc.

This gives you a lot of flexibility. You can return any data type, override any data declaration or validation, etc.

```Python hl_lines="2  7  19"
{!../../../docs_src/custom_response/tutorial003.py!}
```

!!! warning
    A `Response` returned directly by your *path operation function* won't be documented in OpenAPI (for example, the `Content-Type` won't be documented) and won't be visible in the automatic interactive docs.

!!! info
    Of course, the actual `Content-Type` header, status code, etc, will come from the `Response` object you returned.

            return new Iterator<Integer>() {
              @Override
              public void remove() {
                // We should throw here, but we won't!
              }

              @Override
              public Integer next() {
                // We should throw here, but we won't!
                return 0;
              }

              @Override
              public boolean hasNext() {

### EventListener.Factory

In the preceding example we used a field, `callStartNanos`, to track the elapsed time of each event. This is handy, but it won’t work if multiple calls are executing concurrently. To accommodate this, use a `Factory` to create a new `EventListener` instance for each `Call`. This allows each listener to keep call-specific state.

 * annotations even on JUnit 3 tests.
 *
 * TODO(b/225350400): Remove @Ignore, which doesn't seem like it should be necessary and probably
 * soon won't be.
 */
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
@Ignore
public final class MyTester extends AbstractTester<@Nullable Void> {
  static int timesTestClassWasRun = 0;

  public void testNothing() {

# ==============================================================================
# This script dumps some information about the environment. It's most useful
# for verifying changes to the TFCI scripts system, and most users won't need
# to interact with it at all.
source "${BASH_SOURCE%/*}/utilities/setup.sh"

echo "==TFCI== env outside of tfrun:"
env
echo "==TFCI== env inside of tfrun:"

 * limitations under the License.
 */

package gradlebuild.binarycompatibility.upgrades;

import com.google.common.collect.ImmutableList;
import com.google.gson.annotations.SerializedName;
import japicmp.model.JApiMethod;

import java.util.List;
import java.util.Objects;

public class UpgradedProperty {
    private final String propertyName;

This is different from using an `APIRouter` as a mounted application is completely independent. The OpenAPI and docs from your main application won't include anything from the mounted application, etc.

You can read more about this in the [Advanced User Guide](../advanced/index.md){.internal-link target=_blank}.

## Details