Is there a way to tell Jest (lib or CLI) to run only a specific file, or to custom boot like in Jasmine?

[jedwards1211]

Currently I run Jasmine tests inside of Webpack bundles in the following way:

• Using Webpack require contexts to load all modules in __tests__ directories or specific subfolders of them for client/server and unit/integration
• Using a small test script to run Webpack on my test webpack config, and pass the output bundle to Jasmine CLI when it finishes compiling.
• If I run the test script with a --watch flag, it runs Webpack in watch mode and re-runs Jasmine each time Webpack recompiles.

This workflow is simple, easy to understand, and easy to customize for me. In contrast, it appears that Jest loads all files in __tests__ directories, this behavior can't be overridden, and the documentation for Webpack integration clarify any details of the following:

• what bundles actually get created (I'm guessing one bundle per test module?)
• if custom webpack config can be used (custom loaders, custom resolution, etc.) Without this capability I can't use this Jest/Webpack integration with my project.

However, if I can simply run Webpack myself and tell Jest what bundle to run, it seems to me it would work like a charm.

Or, for even more flexibility (for example if I want to run Jest integration tests inside of Meteor) it would be nice if I could custom boot Jest just like one can custom boot Jasmine. The only way to get Meteor globals on scope in the browser or node is to have Meteor call my code. That means I can't have Jest call my code; I have to call Jest myself inside of my code called by Meteor.

[jedwards1211]

After reading through the config options more, it looks like I'll be able to get Jest to load a pre-webpacked bundle. I'll go ahead and close this, and if any issues with running it that way come up, I'll reopen it.

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