Switch run configurations when executing unit tests in different folders

not sure I follow you... Do you mean that WebStorm should use parameters defined in your existing run configurations when creating new configurations, instead of using the default run configuration? No, there is no way to tell WebStorm what existing configuration to use as a template, the default run configuration will always be used

Hello Elena,

exactly - when I run a single unit test by using the run icon next to the unit test method (see picture in my first post) then WebStorm uses the default mocha run configuration for the execution of that test. 

As explained above we have several components in our project folder. Each of that components has its own unit tests. Since the mocha configuration differs between the components I have to create one configuration per component. Because of that I cannot use the really great feature to run a single unit test with one single click because WebStorm is always using the default mocha run configuration.

Currently I have to copy all parameters of a configuration to the default configuration to be able using that feature. This is very cumbersome because the run configurations are quite complex (environment variables,....). The only alternative I have is to mark the test as "only" and run the specific run configuration myself.

It would be great if I can choose a run configuration when no default run configuration exists. Currently the "Edit configuration" dialog is shown when you have no default configuration and try to run a single unit test. There I have to set everything for a new configuration. That does not make sense for me because I already have a working configuration.

It would be even better if WebStorm can do that on its own. You could use the "Test directory" property of a run configuration.

Example:

• Given a mocha run configuration "component 1 tests" with Test directory set to "/root/component1/tests/" and the "include subdirectories" is checked
• In the editor the file "/root/component1/tests/some-dir/myTest.spec.js" is shown
• Clicking on the "run" icon next to a unit test method would start the test using the mocha run configuration "component 1 tests"  instead of the default mocha run configuration

I hope you now can get what I try to explain. 

Thank you.

Please feel free to file a request for this feature to youtrack, https://youtrack.jetbrains.com/issues/WEB

Thank you. Here is my request: https://youtrack.jetbrains.com/issue/WEB-30900

I had a similar need and solved it by having `test/mocha.opts` files, like this:

--slow 100
--timeout 3000
--require esm
--require ./src/index.js

In my case, that `./src/index.js` is setting up some global variables to match
the environment we have in the browser, but in Stefan's case, it can setup
`process.env.VAR`

Thanks Tamas! `mocha.opts` could help here indeed.