Bitbucket Pipelines to run .NETCore and Angular tests on every Push and every Pull Request

bitbucket-pipelines.yml

# Bitbucket Pipelines to run .NETCore and Angular tests on every Push and every Pull Request 
# At the time of writing: .NET Core 2.2, Node 10.16, Angular 8.2
# Example .net core test project: ./MyProject.Tests/MyProject.Tests.csproj
# Example asp.net core host for an angular app: ./MyProject.Web.UI/my-angular-app

image: microsoft/dotnet:sdk

definitions:
  steps:
    - step: &dotnet-test
        name: Run dotnet tests
        caches:
          - dotnetcore
        script: 
          - dotnet restore
          - dotnet test MyProject.Tests
    - step: &ng-test
        name: Run ng tests
        script:
          #install node
          - apt-get update
          - apt-get -y install curl gnupg
          - curl -sL https://deb.nodesource.com/setup_10.x | bash -
          - apt-get -y install nodejs
          #install chrome
          - wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -
          - sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list' 
          - apt-get update
          - apt-get install -y google-chrome-stable fonts-ipafont-gothic fonts-wqy-zenhei fonts-thai-tlwg fonts-kacst ttf-freefont --no-install-recommends 
          - rm -rf /var/lib/apt/lists/*
          #install npm dependencies and run tests
          - pushd ./MyProject.Web.UI/my-angular-app
          - npm install
          - npm install -g @angular/cli
          - ng test --watch=false --browsers=ChromeHeadlessNoSandbox
          - popd

pipelines:
  pull-requests:
    '**':
      - step: *dotnet-test
      - step: *ng-test
  default:
    - step: *dotnet-test
    - step: *ng-test

karma.config.js

# Setup: install Puppeteer as a dev dependency: npm install --save-dev puppeteer
process.env.CHROME_BIN = require('puppeteer').executablePath();

module.exports = function (config) {
  config.set({
    basePath: '',
    frameworks: ['jasmine', '@angular-devkit/build-angular'],
    plugins: [
      require('karma-jasmine'),
      require('karma-chrome-launcher'),
      require('karma-jasmine-html-reporter'),
      require('karma-coverage-istanbul-reporter'),
      require('@angular-devkit/build-angular/plugins/karma')
    ],
    client: {
      clearContext: false // leave Jasmine Spec Runner output visible in browser
    },
    coverageIstanbulReporter: {
      dir: require('path').join(__dirname, './coverage/my-angular-app'),
      reports: ['html', 'lcovonly', 'text-summary'],
      fixWebpackSourcePaths: true
    },
    reporters: ['progress', 'kjhtml'],
    port: 9876,
    colors: true,
    logLevel: config.LOG_INFO,
    autoWatch: true,
    browsers: ['ChromeHeadlessNoSandbox', 'Chrome'],
    customLaunchers: {
      ChromeHeadlessNoSandbox: {
        base: 'ChromeHeadless',
        flags: ['--no-sandbox']
      }
    },
    singleRun: false,
    restartOnFileChange: true
  });
};

This uses Puppeteer (https://github.com/GoogleChrome/puppeteer) to let karma run chrome headless in the pipelines container, so we need to setup karma accordingly:

1. Puppeteer needs to be added as a dev dependency to the Angular app.
   npm install --save-dev puppeteer

2.1. In karma.config.js:
set CHROME_BIN to puppteer's executable path at the top of the file:
process.env.CHROME_BIN = require('puppeteer').executablePath();

2.2. We also add a custom launcher with a --no-sandbox parameter because the container is running as root:

browsers: ['ChromeHeadlessNoSandbox', 'Chrome'],
customLaunchers: {
    ChromeHeadlessNoSandbox: {
      base: 'ChromeHeadless',
      flags: ['--no-sandbox']
    }
},

3. In the pipeline, we run ng test using the custom launcher:
   ng test --watch=false --browsers=ChromeHeadlessNoSandbox