---
title: TestContext
source: https://github.com/remix-run/remix/blob/remix@3.0.0-beta.3/packages/test/src/lib/context.ts#L29
---

# TestContext

## Summary

Test Context providing utilities for testing via `remix-test`.  The context is
passed as the first argument to the [`test`](/api/remix/test/function/test/)/[`it`](/api/remix/test/function/it/) functions.

## Signature

```ts
interface TestContext {
  mock: { fn: any; method: any };
  after(fn: () => void): void;
  serve(server: TestServer): Promise<Page>;
  useFakeTimers(): FakeTimers;
}

```

## Properties

### `mock`

Mock tracker for the current test using [`mock`](/api/remix/test/variable/mock/). Mirrors the shape of Node's
`t.mock`. Method mocks created via `t.mock` are auto-restored on test completion.

## Methods

### `after(fn: () => void): void`

Registers a cleanup function to be called after the test completes.

#### Parameters

##### `fn`

The cleanup function to execute

### `serve(server: TestServer): Promise<Page>`

Wires a running test server up to a Playwright page so the test can drive
it. The server is closed automatically when the test ends. Pair with
createTestServer from `@remix-run/node-fetch-server/test` to spin
up the server.

#### Parameters

##### `server`

The running server the page should target

### `useFakeTimers(): FakeTimers`

Activates fake timers for testing time-dependent code.