simplify test config (#639)

test/karma.conf.js

@@ -0,0 +1,38 @@
+require('babel-polyfill');
+
+require('babel-core/register')({
+  presets: [require('babel-preset-env')]
+});
+
+var getWebpackConfig = require('./get-webpack-conf');
+var travis = process.env.TRAVIS;
+
+module.exports = function(config) {
+  config.set({
+    browsers: travis ? ['PhantomJS'] : ['PhantomJS', 'Chrome'],
+    frameworks: ['mocha', 'sinon-chai'],
+    reporters: ['spec', 'coverage'],
+    files: ['./index.js'],
+    preprocessors: {
+      './index.js': ['webpack'],
+      'test/!(components)/**/*.vue': ['coverage']
+    },
+    webpack: getWebpackConfig(getTestFileName()),
+    webpackMiddleware: {
+      noInfo: true
+    },
+    coverageReporter: {
+      dir: './coverage',
+      reporters: [
+        { type: 'lcov', subdir: '.' },
+        { type: 'text-summary' }
+      ]
+    },
+    singleRun: false
+  });
+};
+
+function getTestFileName() {
+  const flagIndex = process.argv.indexOf('--file');
+  return flagIndex !== -1 ? process.argv[flagIndex + 1] : '';
+}