tests: fix test bundling

package.json

@@ -7,7 +7,7 @@
   "scripts": {
     "lint": "tslint --project tsconfig.json --fix --format stylish ./src/**/*.ts",
     "test": "jest",
-    "test:comms": "rollup -c rollup-tests.config.js && http-server",
+    "test:comms": "rollup -c rollup-tests.config.js",
     "cover": "jest --collectCoverage",
     "start": "gulp",
     "build": "tsc && gulp build && npm run docs",
@@ -49,13 +49,13 @@
     "gulp": "^3.9.1",
     "gulp-connect": "^5.5.0",
     "gulp-plumber": "^1.2.0",
-    "http-server": "^0.11.1",
     "jest": "^23.6.0",
     "js-yaml": "^3.11.0",
     "nunjucks": "^3.1.3",
     "redoc": "^2.0.0-alpha.20",
     "replace-ext": "^1.0.0",
     "rollup": "^0.67.3",
+    "rollup-plugin-commonjs": "^9.2.0",
     "rollup-plugin-node-resolve": "^3.4.0",
     "rollup-plugin-typescript2": "^0.18.0",
     "semantic-release": "^15.10.5",

rollup-tests.config.js

@@ -1,16 +1,25 @@
 import typescript from 'rollup-plugin-typescript2'
+import commonjs from 'rollup-plugin-commonjs'
 import resolve from 'rollup-plugin-node-resolve'
 
 const plugins = [
-  resolve(),
   typescript({
     tsconfigOverride: {
       compilerOptions: {
         module: 'ES2015'
       }
     },
     useTsconfigDeclarationDir: true
-  })
+  }),
+  resolve({
+    // From https://github.com/rollup/rollup-plugin-node-resolve:
+    //  some package.json files have a `browser` field which
+    //  specifies alternative files to load for people bundling
+    //  for the browser. If that's you, use this option, otherwise
+    //  pkg.browser will be ignored
+    browser: true // Default: false
+  }),
+  commonjs()
 ]
 
 export default [{