Jasmine/Karma Specific File Runner README

Or JSFR for short. This extension significantly reduces the amount of time spent waiting for your Angular tests to compile and run in cases where you only want to test a specific set of files.

Below is a comparison between executing a single test file in a moderate-sized project using JSFR (top) and using fdescribe (bottom):

Features

Execute tests in a .spec.ts file by simply right-clicking on it and selecting the option JSFR: Test current file:

Also possible through the file explorer:

To all the tests from a given directory, simply right-click on the corresponding folder instead of a single file.

Requirements

Must have VS Code version 1.76.0 or higher.

Must have VS Code open in an angular project (contains an angular.json file).

Must have the angular cli installed globally (npm i -g @angular/cli).

How does it work?

The default configuration for testing with Angular/Karma has the compiler searching recursively for all .spec.ts files in the project. This is done both in the test.ts file and the tsconfig.spec.json file. Because of this, we're forced to spend the same amount of time compiling every single test whether we wamt to run the whole suite or just a few tests. To solve this problem, JSFR modifies the test.ts and tsconfig.spec.json files so that we're only pointing to a given set of files—those that we actually want to test. These changes are reverted as soon as the testing has ended via terminated the task or closing VS Code.

Limitations

Changes made to the test.ts and tsconfig.spec.json files while JSFR is running won't be kept, as they are reverted to its initial state before starting JSFR.

Releases

See the changelog.