Running a single test file

Question

Is there a way to run ng test for a single file instead of for the entire test suite? Ideally, I\'d like to get the quickest possible feedback loop when I\'m e

Answer 1

I found that ng test has an additional option --include which you can use in order to be able to run test for a single file, or for a particular directory, or for a bunch of files:

// one file
npm run test -- --include src/app/components/component/component-name.component.spec.ts

// directory or bunch of files
npm run test -- --include src/app/components

ng cli docs

Answer 2

In Angular 9 I have had luck with the following:

If you want to test a specific file:

ng test --test-file=path/to/your/file.component.spec.ts

If you want to test only what has changed since your last commit (using git or other version control)

ng test --only-changed

If you have multiple projects in your Angular project and/or are using NX, you can specify an Angular project to test:

ng test project-name

---

---

You can also use

ng test --testNamePattern componentname

for something like path/to/your/component/componentname.spec.ts. This will scan every file in every project, and is slower.

Answer 3

This can be achieved these days via the include option. https://angular.io/cli/test#options

It's a glob match, so as an example:

ng test --include='**/someFolder/*.spec.ts'

I can't find it in the 8.1.0 release notes, but @Swoox mentions below this is a feature after cli version 8.1.0. Thanks for figuring that out.

Answer 4

It's worth mentioning that you can disable particular test without commenting by xdescribe and xit

xdescribe('Hello world', () => { 
  xit('says hello', () => { 
    expect(helloWorld())
        .toEqual('Hello world!');
  });
});

And as somebody already said if you want to focus on some test then fdescribe and fit

fdescribe('Hello world', () => { 
  fit('says hello', () => { 
    expect(helloWorld())
        .toEqual('Hello world!');
  });
});

Answer 5

Works if you specify your spec file as parameter.

For example:

ng test foo.spec.ts

Hope this helps.

Answer 6

You must have to go src/test.ts and can change the following line number code 18:

//Then we find all the tests.
const context = require.context('./', true, /\.spec\.ts$/);

to

//Then we find all the tests.
const context = require.context('./', true, /testing.component\.spec\.ts$/);