[angular] How to execute only one test spec with angular-cli

Adding to this for people like me who were searching for a way to run a single spec in Angular and found this SO.

According to the latest Angular docs (v9.0.6 at time of writing), the ng test command has an --include option where you can specify a directory of *.spec.(ts|tsx) files or just a single .spec.(ts|tsx) file itself.

https://angular.io/cli/test

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