How to execute only one test spec with angular-cli

Each of your .spec.ts file have all its tests grouped in describe block like this:

describe('SomeComponent', () => {...}

You can easily run just this single block, by prefixing the describe function name with f:

fdescribe('SomeComponent', () => {...}

If you have such function, no other describe blocks will run.
Btw. you can do similar thing with it => fit and there is also a “blacklist” version – x. So:

• fdescribe and fit causes only functions marked this way to run
• xdescribe and xit causes all but functions marked this way to run