ruststream 0.7.3

Async messaging framework for Rust: broker-agnostic traits, router, codecs, and a conformance harness for broker authors.
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---
sidebar_position: 3
title: assert_shut_down
description: "TestApp::assert_shut_down asserts a fail-fast failure has shut the service down, as a handler panic does under the default policy."
---

import Tabs from '@theme/Tabs';
import TabItem from '@theme/TabItem';

# assert_shut_down

[`TestApp::assert_shut_down`](api:ruststream::testing::TestApp::assert_shut_down) asserts a fail-fast failure has shut the service down, as a handler panic does under the default policy.

The panicking delivery is still driven to a standstill, so the publish that caused it returns normally.
The record of the subscription, [`subscriber(name)`](../records/subscriber.md), shows the call that [`panicked`](../subscriber-assertions/panicked.md).
After the shutdown every publish through the harness fails with [`TestError::ShutDown`](api:ruststream::testing::TestError::ShutDown).
The assertion fails when the service is still running, which [`assert_running`](./assert-running.md) asserts.
[`run_result`](./run-result.md) gives the failure as a value.

## Example

<Tabs groupId="api">
<TabItem value="macros" label="Macros">

```rust reference="examples/testing_service_state.rs#assert-shut-down"
```

</TabItem>
<TabItem value="manual" label="Manual">

```rust reference="examples/manual/testing_service_state.rs#assert-shut-down"
```

</TabItem>
</Tabs>