Add env variable in package.json brefore cypress runs in headless mode-CodePudding

I want to find out if cypress runs or doesn't run in the NextJS application. My idea is prevent a some http requests in the NextJS application if the Cypress tests are running.

I am able to catch if cypress is running when I run "npx cypress open" for a browser like this:

if(window.Cypress){
 // prevent http request or do something
}

But I am not able to check if the cypress is running or not in headless mode with "npx cypress run" command.

I tried to add extra env variable in the package.json file like in below:

...
"cy:run": "cross-env CY_MODE=true cypress run",
...

But it doesn't set the CY_MODE env variable when I try to log process.env.CY_MODE.

How can I set a custom environment variable before cypress tests start with headless mode?

Thanks

CodePudding user response：

You can set env.variables inside package.json:

create parent command where you define env.variable and contain your command for running tests 'parentCommand': 'cross-env CY_MODE=true npx cypress run'
launch the command and env variable will be shared between files and applications

CodePudding user response：

From Exposing Environment Variables to the Browser

By default environment variables are only available in the Node.js environment, meaning they won't be exposed to the browser.

In order to expose a variable to the browser you have to prefix the variable with NEXT_PUBLIC_.

"cy:run": "cross-env NEXT_PUBLIC_CY_MODE=true cypress run",

Alternatively, you can control the NextJs server from Cypress plugins - see Mock Network When Using Next.js getServerSideProps Call