If you want to see overall test coverage statistics than of course in Angular CLI you can just type below command, and see the bottom of your command prompt window for results.

ng test --cc // or --code-coverage

if you want to see component's individual coverage of tests follow these steps.

1. npm install --save-dev karma-teamcity-reporter

2. Add `require('karma-teamcity-reporter')` to list of plugins in karma.conf.js
   

3. ng test --code-coverage --reporters=teamcity,coverage-istanbul

note that list of reporters is comma-separated, as we have added a new reporter, teamcity.

after running this command you can see the folder coverage in your dir and open index.html for a graphical view of test coverage.

You can also set the coverage threshold that you want to achieve, in karma.conf.js, like this.

coverageIstanbulReporter: {
      reports: ['html', 'lcovonly'],
      fixWebpackSourcePaths: true,
      thresholds: {
        statements: 90,
        lines: 90,
        branches: 90,
        functions: 90
      }
    },