# Prevent using async/await in Cypress test cases (no-async-tests)

Cypress commands that return a promise may cause side effects in before/beforeEach hooks, possibly causing unexpected behavior. 

## Rule Details

This rule disallows using `async` `before` and `beforeEach` functions.

Examples of **incorrect** code for this rule:

```js
describe('my feature', () => {
  before('my test case', async ()  => {
    await cy.get('.myClass')
    // other operations
  })
})
```

```js
describe('my feature', () => {
  before('my test case', async ()  => {
    cy
    .get('.myClass')
    .click()

    await someAsyncFunction()
  })
})
```

Examples of **correct** code for this rule:

```js
describe('my feature', () => {
  before('my test case', ()  => {
    cy.get('.myClass')
    // other operations
  })
})

```

## When Not To Use It

If there are genuine use-cases for using `async/await` in your before then you may not want to include this rule (or at least demote it to a warning).

## Further Reading

- [Commands Are Asynchronous](https://docs.cypress.io/guides/core-concepts/introduction-to-cypress.html#Commands-Are-Asynchronous)
- [Commands Are Promises](https://docs.cypress.io/guides/core-concepts/introduction-to-cypress.html#Commands-Are-Promises)
- [Commands Are Not Promises](https://docs.cypress.io/guides/core-concepts/introduction-to-cypress.html#Commands-Are-Not-Promises)