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Nov 7, 2022
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docs: usingMatchers mention toStrictEqual #13560

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docs: usingMatchers mention toStrictEqual
necipallef Nov 4, 2022
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docs: usingMatchers mention toStrictEqual
necipallef Nov 4, 2022
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docs: changelog for toStrictEqual mentions
necipallef Nov 4, 2022
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docs: usingMatchers mention toStrictEqual in old version docs
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docs: usingMatchers mention toStrictEqual
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@necipallef
necipallef authored Nov 4, 2022
commit fe0118fe9ecfbc6b4a0c76b3e7679f7198fa67aa
10 changes: 8 additions & 2 deletions docs/UsingMatchers.md
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Expand Up @@ -17,7 +17,7 @@ test('two plus two is four', () => {

In this code, `expect(2 + 2)` returns an "expectation" object. You typically won't do much with these expectation objects except call matchers on them. In this code, `.toBe(4)` is the matcher. When Jest runs, it tracks all the failing matchers so that it can print out nice error messages for you.

`toBe` uses `Object.is` to test exact equality. If you want to check the value of an object, use `toEqual` instead:
`toBe` uses `Object.is` to test exact equality. If you want to check the value of an object, use `toEqual` or `toStrictEqual` instead:

```js
test('object assignment', () => {
Expand All @@ -29,7 +29,13 @@ test('object assignment', () => {

`toEqual` recursively checks every field of an object or array.

You can also test for the opposite of a matcher:
:::tip

Using `toStrictEqual` is preferred over using `toEqual`. `toEqual` simply ignores `undefined` values, whereas `toStrictEqual` takes them into account.

:::

You can also test for the opposite of a matcher using `not`:

```js
test('adding positive numbers is not zero', () => {
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