Add karma browser tests for es5 builds

circle.yml

@@ -24,6 +24,7 @@ dependencies:
     - cd danger && yarn install --no-progress
 test:
   override:
+    - yarn run test-ci-es5-build-in-browser
     - nvm alias default 6
     - yarn run test-ci
     - nvm alias default 4

integration_tests/browser-support/browser-test.js

@@ -0,0 +1,16 @@
+/* eslint-disable */
+var expect = require('../../packages/jest-matchers/build-es5/index.js');
+var mock = require('../../packages/jest-mock/build-es5/index.js');
+
+describe('es5 builds in browser', function() {
+  it('runs assertions', function() {
+    expect(1).toBe(1);
+  });
+
+  it('runs mocks', function() {
+    var someMockFunction = mock.fn();
+    expect(someMockFunction.mock.calls.length).toBe(0);
+    someMockFunction();
+    expect(someMockFunction.mock.calls.length).toBe(1);
+  });
+});

karma.conf.js

@@ -0,0 +1,14 @@
+module.exports = config => {
+  config.set({
+    // browsers: ['Chrome'],
+    browsers: ['ChromeHeadless'],
+    files: [
+      'integration_tests/browser-support/browser-test.js',
+    ],
+    frameworks: ['mocha', 'browserify'],
+    plugins: ['karma-browserify', 'karma-chrome-launcher', 'karma-mocha'],
+    preprocessors: {
+      'integration_tests/browser-support/browser-test.js': ['browserify'],
+    },
+  });
+};

package.json

@@ -16,6 +16,7 @@
     "babel-preset-env": "^1.4.0",
     "babel-preset-react": "^6.24.1",
     "babel-preset-react-native": "^1.9.1",
+    "browserify": "^14.4.0",
     "chalk": "^1.1.3",
     "codecov": "^1.0.1",
     "cross-spawn": "^5.1.0",
@@ -35,10 +36,15 @@
     "jasmine-reporters": "^2.2.0",
     "jquery": "^3.2.1",
     "jsdom": "^9.12.0",
+    "karma": "^1.7.0",
+    "karma-browserify": "^5.1.1",
+    "karma-chrome-launcher": "^2.1.1",
+    "karma-mocha": "^1.3.0",
     "left-pad": "^1.1.1",
     "lerna": "2.0.0-rc.4",
     "micromatch": "^2.3.11",
     "mkdirp": "^0.5.1",
+    "mocha": "^3.4.2",
     "prettier": "1.3.1",
     "progress": "^1.1.8",
     "react": "15.4.2",
@@ -73,6 +79,7 @@
     "prettier": "node scripts/prettier.js write",
     "postinstall": "node ./scripts/postinstall.js && yarn run build --silent && (cd packages/eslint-plugin-jest && yarn link --silent) && yarn link eslint-plugin-jest --silent",
     "publish": "yarn run build-clean --silent && yarn run build --silent && lerna publish --silent",
+    "test-ci-es5-build-in-browser": "karma start --single-run",
     "test-ci": "yarn run typecheck --silent && yarn run lint --silent && yarn run lint-es5-build && yarn run jest-coverage --silent -- -i && yarn run test-examples --silent && node scripts/mapCoverage.js && codecov",
     "test-ci-partial": "yarn run jest --silent -- -i && yarn run test-examples --silent",
     "test-examples": "node scripts/test_examples.js",