52 lines
1.6 KiB
Markdown
52 lines
1.6 KiB
Markdown
# Prevent using async/await in Cypress test cases (no-async-tests)
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Cypress tests [that return a promise will error](https://docs.cypress.io/guides/references/error-messages.html#Cypress-detected-that-you-returned-a-promise-from-a-command-while-also-invoking-one-or-more-cy-commands-in-that-promise) and cannot run successfully. An `async` function returns a promise under the hood, so a test using an `async` function will also error.
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## Rule Details
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This rule disallows using `async` test functions.
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Examples of **incorrect** code for this rule:
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```js
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describe('my feature', () => {
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it('my test case', async () => {
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await cy.get('.myClass')
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// other operations
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})
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})
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```
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```js
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describe('my feature', () => {
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it('my test case', async () => {
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cy
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.get('.myClass')
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.click()
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await someAsyncFunction()
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})
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})
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```
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Examples of **correct** code for this rule:
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```js
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describe('my feature', () => {
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it('my test case', () => {
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cy.get('.myClass')
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// other operations
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})
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})
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```
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## When Not To Use It
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If there are genuine use-cases for using `async/await` in your test cases then you may not want to include this rule (or at least demote it to a warning).
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## Further Reading
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- [Commands Are Asynchronous](https://docs.cypress.io/guides/core-concepts/introduction-to-cypress.html#Commands-Are-Asynchronous)
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- [Commands Are Promises](https://docs.cypress.io/guides/core-concepts/introduction-to-cypress.html#Commands-Are-Promises)
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- [Commands Are Not Promises](https://docs.cypress.io/guides/core-concepts/introduction-to-cypress.html#Commands-Are-Not-Promises)
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