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docs: what you will learn section (#16314)

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docs/src/writing-tests-js.md
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@ -5,7 +5,17 @@ title: "Writing Tests"
Playwright assertions are created specifically for the dynamic web. Checks are automatically retried until the necessary conditions are met. Playwright comes with [auto-wait](./actionability.md) built in meaning it waits for elements to be actionable prior to performing actions. Playwright provides a [test](./api/class-test.md) function to declare tests and the [expect](https://jestjs.io/docs/expect) function to write assertions. Playwright assertions are created specifically for the dynamic web. Checks are automatically retried until the necessary conditions are met. Playwright comes with [auto-wait](./actionability.md) built in meaning it waits for elements to be actionable prior to performing actions. Playwright provides a [test](./api/class-test.md) function to declare tests and the [expect](https://jestjs.io/docs/expect) function to write assertions.
Take a look at the example test included when installing Playwright to see how to write a test using web first assertions, locators and selectors. **You will learn**
- [How the example test works](/writing-tests.md#the-example-test)
- [How to use assertions](/writing-tests.md#assertions)
- [How to use locators](/writing-tests.md#locators)
- [How tests run in isolation](/writing-tests.md#test-isolation)
- [How to use test hooks](/writing-tests.md#using-test-hooks)
## The Example Test
Take a look at the example test included when installing Playwright to see how to write a test using [web first assertions](/test-assertions.md), [locators](/locators.md) and [selectors](/selectors.md).
```js tab=js-js ```js tab=js-js
// @ts-check // @ts-check