jest updateSnapshot for specific test file

Question

I'm trying to figure out how o update a single snapshot file. In the docs it says just add the -t and I presume the file name but thats not working for me.

Example, in terminal I use.

jest -u -t test/js/tests/components/myTestApp.test.js

Any ideas why this is not working?. I also added the name as a string.

Cheapjack

Answer 1

According to doc https://facebook.github.io/jest/docs/en/cli.html -t option is searching not for file name, but for specific spec name. They provided an example

jest -u -t="ColorPicker"

where "ColorPicker" is name of the spec, given in describe or test blocks.

Simonesimoneau

So, do I NEED to install jest-cli globally? Because it says "The term 'jest' is not recognized as the name of a cmdlet..." ? – Carcassonne

@Carcassonne you don't have to install jest globally as you could pre-pend it with npx (i.e. npx jest -u -t="ColorPicker") to call the local instance of the package. – Graber

Answer 2

In order to update particular snapshot, you can pass name as an argument to your script test command.

In package.json

"test": "jest --verbose"

In command line

npm test "<spec name>" -- -u

OR

npm test "<spec name>" -- --updateSnapshot

Cordellcorder

thanks! both command line commands worked for me and I didn't have to install jest globally! – Unsay

Answer 3

this works

jest /path/to/file --updateSnapshot

Finsen

Answer 4

If you run Jest via npm test, you can use arguments by inserting a -- between npm test and the Jest arguments - path & snapshot flag:

npm test -- path/to/file -u

Opalescent

Answer 5

Late reply, but want to contribute to this topic, in the specific doubt about needing to install jest globaly:

You don't need to install jest globally, and there is an alternative to create a script command in package.json. The option is to execute the command as:

npx jest -u -t="ColorPicker"

Npx let you execute locally installed packages and it's bundled in npm 5.2.0 and above

Cripple