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docs: improve clock guide (#31487)
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debs-obrien committed Jun 28, 2024
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Expand Up @@ -8,6 +8,18 @@ import LiteYouTube from '@site/src/components/LiteYouTube';

Accurately simulating time-dependent behavior is essential for verifying the correctness of applications. Utilizing [Clock] functionality allows developers to manipulate and control time within tests, enabling the precise validation of features such as rendering time, timeouts, scheduled tasks without the delays and variability of real-time execution.

The [Clock] API provides the following methods to control time:
- `setFixedTime`: Sets the fixed time for `Date.now()` and `new Date()`.
- `install`: initializes the clock and allows you to:
- `pauseAt`: Pauses the time at a specific time.
- `fastForward`: Fast forwards the time.
- `runFor`: Runs the time for a specific duration.
- `resume`: Resumes the time.
- `setSystemTime`: Sets the current system time.

The recommended approach is to use `setFixedTime` to set the time to a specific value. If that doesn't work for your use case, you can use `install` which allows you to pause time later on, fast forward it, tick it, etc. `setSystemTime` is only recommended for advanced use cases.

:::note
[`property: Page.clock`] overrides native global classes and functions related to time allowing them to be manually controlled:
- `Date`
- `setTimeout`
Expand All @@ -19,6 +31,7 @@ Accurately simulating time-dependent behavior is essential for verifying the cor
- `requestIdleCallback`
- `cancelIdleCallback`
- `performance`
:::

## Test with predefined time

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