Setup karma-ng-html2js-preprocessor

install

$ npm install --save-dev karma-ng-html2js-preprocessor

karma.conf.js

// Working example from Ionic app
module.exports = function (config) {
  config.set({

    basePath: './www',

    files: [
      // ...existing src...
      '**/*.html',
      // ...existing tests...
    ],

    plugins: [
      'karma-jasmine',
      'karma-phantomjs-launcher',
      'karma-ng-html2js-preprocessor'
    ],

    preprocessors: {
      '**/*.html': ['ng-html2js']
    },

    ngHtml2JsPreprocessor: {
      moduleName: 'ngViews',
      stripPrefix: 'www/'
    },

    reporters: ['progress']

  });
};