How to execute only one test spec with angular-cli

Question

I have Angular2 project build with Angular-CLI (beta 20).

Is there a way to run tests against only one selected spec file?

I used to have a project based on

Answer 1

Just small change need in test.ts file inside src folder:

const context = require.context('./', true, /test-example\.spec\.ts$/);

Here, test-example is the exact file name which we need to run

In the same way, if you need to test the service file only you can replace the filename like "/test-example.service"

Answer 2

This worked for me in every case:

ng test --include='**/dealer.service.spec.ts'

However, I usually got "TypeError: Cannot read property 'ngModule' of null" for this:

ng test --main src/app/services/dealer.service.spec.ts

Version of @angular/cli 10.0.4

Answer 3

Configure test.ts file inside src folder:

const context = require.context('./', true, /\.spec\.ts$/);

Replace /\.spec\.ts$/ with the file name you want to test. For example: /app.component\.spec\.ts$/

This will run test only for app.component.spec.ts.

Answer 4

You can test only specific file with the Angular CLI (the ng command) like this:

ng test --main ./path/to/test.ts

Further docs are at https://angular.io/cli/test

Note that while this works for standalone library files, it will not work for angular components/services/etc. This is because angular files have dependencies on other files (namely src/test.ts in Angular 7). Sadly the --main flag doesn't take multiple arguments.