Add browser tests (#696)

package.json

@@ -23,7 +23,9 @@
     "inspect": "browserify --full-paths index -p tinyify | discify --open",
     "prepublishOnly": "npm run build",
     "start": "bankai start example",
-    "test": "standard && npm run deps && node test.js"
+    "test": "standard && npm run deps && npm run test:node && npm run test:browser",
+    "test:node": "node test/node.js | tap-format-spec",
+    "test:browser": "browserify test/browser.js | tape-run | tap-format-spec"
   },
   "repository": "choojs/choo",
   "keywords": [
@@ -52,6 +54,7 @@
     "xtend": "^4.0.1"
   },
   "devDependencies": {
+    "@tap-format/spec": "^0.2.0",
     "@types/node": "^10.3.1",
     "browserify": "^16.2.2",
     "bundle-collapser": "^1.2.1",
@@ -62,6 +65,7 @@
     "spok": "^0.9.1",
     "standard": "^11.0.1",
     "tape": "^4.6.3",
+    "tape-run": "^5.0.0",
     "tinyify": "^2.2.0"
   }
 }