use central jest config in browser package

jest.config.js

@@ -5,6 +5,7 @@ module.exports = {
     '^.+\\.ts$': 'ts-jest',
     '^.+\\.tsx$': 'ts-jest',
   },
+  coverageDirectory: '<rootDir>/coverage',
   moduleFileExtensions: ['js', 'ts', 'tsx'],
   testEnvironment: 'node',
   testMatch: ['<rootDir>/**/*.test.ts', '<rootDir>/**/*.test.tsx'],

packages/browser/jest.config.js

@@ -0,0 +1,7 @@
+const baseConfig = require('../../jest.config.js');
+
+module.exports = {
+  ...baseConfig,
+  testEnvironment: 'jsdom',
+  testMatch: ['<rootDir>/test/unit/**/*.test.ts'],
+};

packages/browser/package.json

@@ -72,11 +72,11 @@
     "size:check:es5": "cat build/bundles/bundle.min.js | gzip -9 | wc -c | awk '{$1=$1/1024; print \"ES5: \",$1,\"kB\";}'",
     "size:check:es6": "cat build/bundles/bundle.es6.min.js | gzip -9 | wc -c | awk '{$1=$1/1024; print \"ES6: \",$1,\"kB\";}'",
     "test": "run-s test:unit",
-    "test:unit": "jest --config test/unit/jest.config.js",
+    "test:unit": "jest",
     "test:integration": "test/integration/run.js",
     "test:integration:checkbrowsers": "node scripts/checkbrowsers.js",
     "test:package": "node test/package/npm-build.js && rm test/package/tmp.js",
-    "test:unit:watch": "jest --config test/unit/jest.config.js --watch",
+    "test:unit:watch": "jest --watch",
     "test:integration:watch": "test/integration/run.js --watch"
   },
   "volta": {