@cowprotocol/cow-sdk
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# Suggest using the built-in equality matchers (`prefer-equality-matcher`)
Jest has built-in matchers for expecting equality which allow for more readable
tests and error messages if an expectation fails.
## Rule details
This rule checks for _strict_ equality checks (`===` & `!==`) in tests that
could be replaced with one of the following built-in equality matchers:
- `toBe`
- `toEqual`
- `toStrictEqual`
Examples of **incorrect** code for this rule:
```js
expect(x === 5).toBe(true);
expect(name === 'Carl').not.toEqual(true);
expect(myObj !== thatObj).toStrictEqual(true);
```
Examples of **correct** code for this rule:
```js
expect(x).toBe(5);
expect(name).not.toEqual('Carl');
expect(myObj).toStrictEqual(thatObj);
```