test(browser): ensure dist files are built for browser testing

Author: mbroadst

package.json

@@ -30,7 +30,7 @@
   "scripts": {
     "test": "npm run-script test-node && npm run-script test-browser",
     "test-node": "mocha test/",
-    "test-browser": "karma start",
+    "test-browser": "npm run-script build && karma start",
     "docs": "jsdoc2md --heading-depth 3 --template etc/README.hbs --plugin dmd-clear --files lib/ext_json.js > README.md",
     "coverage": "istanbul cover _mocha -- --recursive -t --ui tdd test/",
     "lint": "eslint lib test",