old_contents: module.exports = (config) => {
      config.set({
          browserConsoleLogOptions: {
              level: 'debug',
              format: '%b %T: %m',
              terminal: true
          },
          frameworks: ['mocha', 'chai', 'sinon'],
          files: [
              'test/*_test.js'
          ],
          preprocessors: {
              'lib/index.js': ['rollup', 'coverage'],
              'test/*_test.js': ['rollup']
          },
          rollupPreprocessor: {
              plugins: [
                  require('rollup-plugin-babel')(),
                  require('rollup-plugin-istanbul')({
                      exclude: ['test/*_test.js'],
                  }),
              ],
              format: 'iife',
              sourceMap: 'inline'
          },
          customContextFile: 'test/context.html',
          customLaunchers: {
              'PhantomJS_Desktop': {
                  base: 'PhantomJS',
                  options: {
                      viewportSize: {
                          width: 800,
                          height: 600,
                      }
                  }
              },
          },
          browsers: ['PhantomJS_Desktop'],
          reporters: ['mocha', 'coverage'],
          singleRun: true,
      });
  };
  
new_contents: module.exports = (config) => {
      config.set({
          browserConsoleLogOptions: {
              level: 'debug',
              format: '%b %T: %m',
              terminal: true
          },
          frameworks: ['mocha', 'chai', 'sinon'],
          files: [
              'test/*_test.js'
          ],
          preprocessors: {
              'lib/index.js': ['rollup', 'coverage'],
              'test/*_test.js': ['rollup']
          },
          rollupPreprocessor: {
              plugins: [
                  require('rollup-plugin-babel')(),
                  require('rollup-plugin-istanbul')({
                      exclude: ['test/*_test.js'],
                  }),
              ],
              format: 'iife',
              sourceMap: 'inline'
          },
          customContextFile: 'test/context.html',
          customLaunchers: {
              'PhantomJS_Desktop': {
                  base: 'PhantomJS',
                  options: {
                      viewportSize: {
                          width: 800,
                          height: 600,
                      }
                  }
              },
          },
          browsers: ['PhantomJS_Desktop'],
          reporters: ['mocha', 'coverage'],
          coverageReporter: {
              reporters: [{type: 'lcov'}]
          }, 
          singleRun: true,
      });
  };
  
subject: Change coverage format