Adding rudimentary testing

.travis.yml

@@ -0,0 +1,9 @@
+cache:
+  yarn: true
+  directories:
+    - node_modules
+install:
+  - yarn
+  - yarn bootstrap
+script:
+  - yarn test

package.json

@@ -18,9 +18,11 @@
     "docs:deploy": "yarn docs:build && gh-pages --dist _book --remote upstream",
     "docs:serve": "gitbook serve",
     "release": "yarn release:pre && oao publish",
-    "release:pre": "oao prepublish"
+    "release:pre": "oao prepublish",
+    "test": "ava packages/*/test"
   },
   "devDependencies": {
+    "ava": "^0.18.2",
     "changelog": "^1.0.7",
     "gh-pages": "^0.12.0",
     "gitbook-cli": "^2.3.0",

packages/neutrino/package.json

@@ -27,8 +27,5 @@
     "webpack-chain": "^1.4.2",
     "webpack-dev-server": "^2.4.1",
     "yargs": "^6.6.0"
-  },
-  "devDependencies": {
-    "ava": "^0.18.2"
   }
 }

packages/neutrino/src/neutrino.js

@@ -38,11 +38,7 @@ class Neutrino extends EventEmitter {
   }
 
   getWebpackOptions() {
-    if (this.__configCache) {
-      return this.__configCache;
-    }
-
-    return this.__configCache = this.config.toConfig();
+    return this.config.toConfig();
   }
 
   emitForAll(eventName, payload) {

packages/neutrino/test/api_test.js

@@ -0,0 +1,117 @@
+import test from 'ava';
+import Neutrino from '../src/neutrino';
+
+test('initializes with no arguments', t => {
+  t.notThrows(() => new Neutrino());
+});
+
+test('initializes with options', t => {
+  t.notThrows(() => new Neutrino({ testing: true }));
+});
+
+test('initialization stores options', t => {
+  const options = { alpha: 'a', beta: 'b', gamma: 'c' };
+  const api = new Neutrino(options);
+
+  t.deepEqual(options, api.options);
+});
+
+test('creates an instance of webpack-chain', t => {
+  const api = new Neutrino();
+
+  t.is(typeof api.config.toConfig, 'function');
+});
+
+test('middleware receives API instance', t => {
+  const api = new Neutrino();
+
+  api.use(n => t.is(n, api));
+});
+
+test('middleware receives default options', t => {
+  const api = new Neutrino();
+
+  api.use((api, options) => {
+    t.deepEqual(options, {});
+  });
+});
+
+test('middleware receives options parameter', t => {
+  const api = new Neutrino();
+  const defaults = { alpha: 'a', beta: 'b', gamma: 'c' };
+
+  api.use((api, options) => {
+    t.deepEqual(options, defaults);
+  }, defaults);
+});
+
+test('triggers promisified event handlers', t => {
+  const api = new Neutrino();
+
+  api.on('test', () => t.pass('test event triggered'));
+  api.emitForAll('test');
+});
+
+test('events handle promise resolution', async t => {
+  const api = new Neutrino();
+
+  api.on('test', () => Promise.resolve('alpha'));
+
+  const [value] = await api.emitForAll('test');
+
+  t.is(value, 'alpha');
+});
+
+test('events handle promise rejection', async t => {
+  const api = new Neutrino();
+
+  api.on('test', () => Promise.reject(new Error('beta')));
+
+  const err = await t.throws(api.emitForAll('test'));
+
+  t.is(err.message, 'beta');
+});
+
+test('events handle multiple promise resolutions', async t => {
+  const api = new Neutrino();
+
+  api.on('test', () => Promise.resolve('alpha'));
+  api.on('test', () => Promise.resolve('beta'));
+  api.on('test', () => Promise.resolve('gamma'));
+
+  const values = await api.emitForAll('test');
+
+  t.deepEqual(values, ['alpha', 'beta', 'gamma']);
+});
+
+test('creates a Webpack config', t => {
+  const api = new Neutrino();
+
+  api.use(api => {
+    api.config.module
+      .rule('compile')
+      .test(/\.js$/)
+      .include('src')
+      .loader('babel', 'babel-loader', { alpha: 'a', beta: 'b' });
+  });
+
+  t.deepEqual(api.getWebpackOptions(), {
+    resolve: { modules: [], extensions: [] },
+    resolveLoader: { modules: [] },
+    plugins: [],
+    module: {
+      rules: [
+        {
+          test: /\.js$/,
+          include: ['src'],
+          use: [
+            {
+              loader: 'babel-loader',
+              options: { alpha: 'a', beta: 'b' }
+            }
+          ]
+        }
+      ]
+    }
+  });
+});