Add basic tests + various infrastructure.

.eslintrc

@@ -3,4 +3,4 @@ extends:
 	- formidable/configurations/es6-node
 rules:
   func-style: off
-  arrow-parens: off
+  arrow-parens: [error, as-needed]

.gitignore

@@ -3,4 +3,6 @@ node_modules
 
 # misc
 .DS_Store
-npm-debug.log
+npm-debug.log
+.nyc_output
+.coverage

.nycrc

@@ -0,0 +1,8 @@
+{
+  "reporter": [
+    "html",
+    "lcov",
+    "text-summary"
+  ],
+  "report-dir": "./.coverage"
+}

.travis.yml

@@ -13,4 +13,4 @@ branches:
 
 script:
   - yarn --version
-  - yarn run check
+  - yarn run check-ci

bin/webpack-dashboard.js

@@ -9,83 +9,93 @@ const SocketIO = require("socket.io");
 const DEFAULT_PORT = 9838;
 
 const program = new commander.Command("webpack-dashboard");
-
 const pkg = require("../package.json");
-program.version(pkg.version);
-program.option("-c, --color [color]", "Dashboard color");
-program.option("-m, --minimal", "Minimal mode");
-program.option("-t, --title [title]", "Terminal window title");
-program.option("-p, --port [port]", "Socket listener port");
-program.usage("[options] -- [script] [arguments]");
-program.parse(process.argv);
-
-let logFromChild = true;
-let child;
-
-if (!program.args.length) {
-  logFromChild = false;
-}
-
-if (logFromChild) {
-  const command = program.args[0];
-  const args = program.args.slice(1);
-  const env = process.env;
 
-  env.FORCE_COLOR = true;
+// Wrap up side effects in a script.
+const main = module.exports = opts => { // eslint-disable-line max-statements
+  opts = opts || {};
+  const argv = typeof opts.argv === "undefined" ? process.argv : opts.argv;
+
+  program.version(pkg.version);
+  program.option("-c, --color [color]", "Dashboard color");
+  program.option("-m, --minimal", "Minimal mode");
+  program.option("-t, --title [title]", "Terminal window title");
+  program.option("-p, --port [port]", "Socket listener port");
+  program.usage("[options] -- [script] [arguments]");
+  program.parse(argv);
+
+  let logFromChild = true;
+  let child;
+
+  if (!program.args.length) {
+    logFromChild = false;
+  }
+
+  if (logFromChild) {
+    const command = program.args[0];
+    const args = program.args.slice(1);
+    const env = process.env;
+
+    env.FORCE_COLOR = true;
+
+    child = spawn(command, args, {
+      env,
+      stdio: [null, null, null, null],
+      detached: true
+    });
+  }
 
-  child = spawn(command, args, {
-    env,
-    stdio: [null, null, null, null],
-    detached: true
+  const dashboard = new Dashboard({
+    color: program.color || "green",
+    minimal: program.minimal || false,
+    title: program.title || null
   });
-}
 
-const dashboard = new Dashboard({
-  color: program.color || "green",
-  minimal: program.minimal || false,
-  title: program.title || null
-});
+  const port = program.port || DEFAULT_PORT;
+  const server = opts.server || new SocketIO(port);
 
-const port = program.port || DEFAULT_PORT;
-const server = new SocketIO(port);
-
-server.on("error", (err) => {
-  // eslint-disable-next-line no-console
-  console.log(err);
-});
+  server.on("error", err => {
+    // eslint-disable-next-line no-console
+    console.log(err);
+  });
 
-if (logFromChild) {
-  server.on("connection", (socket) => {
-    socket.emit("mode", { minimal: program.minimal || false });
+  if (logFromChild) {
+    server.on("connection", socket => {
+      socket.emit("mode", { minimal: program.minimal || false });
 
-    socket.on("message", (message) => {
-      if (message.type !== "log") {
-        dashboard.setData(message);
-      }
+      socket.on("message", message => {
+        if (message.type !== "log") {
+          dashboard.setData(message);
+        }
+      });
     });
-  });
 
-  child.stdout.on("data", (data) => {
-    dashboard.setData([{
-      type: "log",
-      value: data.toString("utf8")
-    }]);
-  });
+    child.stdout.on("data", data => {
+      dashboard.setData([{
+        type: "log",
+        value: data.toString("utf8")
+      }]);
+    });
 
-  child.stderr.on("data", (data) => {
-    dashboard.setData([{
-      type: "log",
-      value: data.toString("utf8")
-    }]);
-  });
+    child.stderr.on("data", data => {
+      dashboard.setData([{
+        type: "log",
+        value: data.toString("utf8")
+      }]);
+    });
 
-  process.on("exit", () => {
-    process.kill(process.platform === "win32" ? child.pid : -child.pid);
-  });
-} else {
-  server.on("connection", (socket) => {
-    socket.on("message", (message) => {
-      dashboard.setData(message);
+    process.on("exit", () => {
+      process.kill(process.platform === "win32" ? child.pid : -child.pid);
     });
-  });
+  } else {
+    server.on("connection", socket => {
+      socket.on("message", message => {
+        dashboard.setData(message);
+      });
+    });
+  }
+};
+
+if (require.main === module) {
+  main();
 }