Tests are often not rerunning when files change

I'm using karma with an angular project. When I do ng test --browsers=Chrome it will run the test the first time. If I make a change to a file it will compile and then the tests won't get rerun. If I keep on trying to change a file it will randomly rerun test sometimes but most of the time it won't run them. When it doesn't rerun tests it shows this in the debug messages and just stays there.

23 04 2020 14:46:30.985:DEBUG [karma-server]: List of files has changed, trying to execute
23 04 2020 14:46:30.986:DEBUG [karma]: All browsers are ready, executing
23 04 2020 14:46:30.986:DEBUG [karma]: Captured 1 browsers

It also happens with ChromeHeadless. It doesn't seem to happen with Firefox though.

karma.conf.js

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-firefox-launcher'),
      require('karma-coverage-istanbul-reporter'),
      require('@angular-devkit/build-angular/plugins/karma')
    ],
    client: {
      clearContext: true, 
      jasmine: {
        failSpecWithNoExpectations: true
      }
    },
    mime: {
      'text/x-typescript': ['ts', 'tsx']
    },
    coverageIstanbulReporter: {
      dir: require('path').join(__dirname, './coverage'),
      reports: ['html', 'lcovonly', 'text-summary'],
      fixWebpackSourcePaths: true,
      thresholds: {
        emitWarning: false, 
        // thresholds for all files
        global: {
          statements: 80, 
          branches: 60, 
          functions: 75, 
          lines: 80, 
        },
        // thresholds per file
        each: {
          statements: 60, 
          lines: 60, 
          branches: 25, 
          functions: 35, 
        }
      },
    },
    reporters: ['progress', 'kjhtml'],
    port: 9876,
    colors: true,
    logLevel: config.LOG_DEBUG,
    autoWatch: true,
    browsers: ['ChromeHeadless', 'FirefoxHeadless'],
    captureTimeout: 120000,
    customLaunchers: {
      HeadlessChrome: {
        base: 'ChromeHeadless',
        flags: [
          '--headless',
          '--no-sandbox'
        ]
      },
      HeadlessFirefox: {
        base: 'FirefoxHeadless',
        flags: [
          '-headless',
        ],
      }
    },
    singleRun: false,
    restartOnFileChange: true
  });
};

Version karma-chrome-launcher: 3.1.0 karma: 5.0.2

karma-runner / karma-chrome-launcher

Tests are often not rerunning when files change #221