if (deferredPlans.isNotEmpty()) return deferredPlans.removeFirst() as FakePlan

    if (nextPlanIndex >= plans.size && autoGeneratePlans) addPlan()

    require(nextPlanIndex < plans.size) {
      "not enough plans! call addPlan() or set autoGeneratePlans=true in the test to set this up"
    }
    val result = plans[nextPlanIndex++]
    events += "take plan ${result.id}"

    if (result.yieldBeforePlanReturns) {

    // Ping every 500 ms, starting at 500 ms.
    client =
      client.newBuilder()
        .pingInterval(Duration.ofMillis(500))
        .build()

    // Delay the response to give 1 ping enough time to be sent and replied to.
    server.enqueue(
      MockResponse.Builder()
        .bodyDelay(750, TimeUnit.MILLISECONDS)
        .body("ABC")
        .build(),
    )

    ```

### Return values

And they can return values or not, the values won't be used.

So, you can re-use a normal dependency (that returns a value) you already use somewhere else, and even though the value won't be used, the dependency will be executed:

=== "Python 3.9+"

    ```Python hl_lines="11  16"
    {!> ../../../docs_src/dependencies/tutorial006_an_py39.py!}
    ```

=== "Python 3.8+"

  // "ci-cd". The set of fields is always in the version that the
  // workflow used when modifying the object.
  //
  // +optional
  repeated ManagedFieldsEntry managedFields = 17;
}

// OwnerReference contains enough information to let you identify an owning
// object. An owning object must be in the same namespace as the dependent, or
// be cluster-scoped, so there is no namespace field.
// +structType=atomic
message OwnerReference {

            setOf("barchart-udt-bundle", "guava", "commons-cli")
        )

        // TODO: Gradle profiler should use the bundled tooling API.
        //   This should actually be handled by conflict resolution, though it doesn't seem to work.
        //   See https://github.com/gradle/gradle/issues/12002.
        withLibraryDependencies<DependencyRemovalByNameRule>(
            "org.gradle.profiler:gradle-profiler",

   * receiving. With duplex the request and response may be interleaved! That is, request body bytes
   * may be sent after response headers or body bytes have been received.
   *
   * Though any call may be initiated as a duplex call, only web servers that are specially
   * designed for this nonstandard interaction will use it. As of 2019-01, the only widely-used
   * implementation of this pattern is [gRPC][grpc].
   *

        Prefer to use the `Annotated` version if possible.

    ```Python hl_lines="13"
    {!> ../../../docs_src/dependencies/tutorial005.py!}
    ```

Let's focus on the parameters declared:

* Even though this function is a dependency ("dependable") itself, it also declares another dependency (it "depends" on something else).
    * It depends on the `query_extractor`, and assigns the value returned by it to the parameter `q`.

    {!> ../../../docs_src/query_params/tutorial002.py!}
    ```

In this case, the function parameter `q` will be optional, and will be `None` by default.

!!! check
    Also notice that **FastAPI** is smart enough to notice that the path parameter `item_id` is a path parameter and `q` is not, so, it's a query parameter.

## Query parameter type conversion

You can also declare `bool` types, and they will be converted:

- [`KT-57754`](https://youtrack.jetbrains.com/issue/KT-57754) K2: No public signature built for the synthesized delegate field
- [`KT-58533`](https://youtrack.jetbrains.com/issue/KT-58533) K2: "Not enough information to infer type variable T" for generic call in throw expression
- [`KT-34846`](https://youtrack.jetbrains.com/issue/KT-34846) FIR Java: enhance type parameter bounds properly

  // different than the options the caller provided. e.g. for a patch request the performed
  // Operation might be a CREATE, in which case the Options will a
  // `meta.k8s.io/v1.CreateOptions` even though the caller provided `meta.k8s.io/v1.PatchOptions`.
  // +optional
  optional k8s.io.apimachinery.pkg.runtime.RawExtension options = 12;
}

// AdmissionResponse describes an admission response.