Added test to check missing options

Author: nuxy

test/cli.js

@@ -0,0 +1,53 @@
+'use strict';
+
+const chai = require('chai');
+const exec = require('child_process').exec;
+const path = require('path');
+
+const expect = chai.expect;
+
+describe('CLI', function() {
+  describe('options', function() {
+
+    // Override environment.
+    before(function() {
+      process.env.NODE_ENV = null;
+    });
+
+    after(function() {
+      process.env.NODE_ENV = 'test';
+    });
+
+    describe('--handler', function() {
+      describe('missing value', function() {
+        it('should return error', function(done) {
+          testOption(['--handler'], function(stdout) {
+            expect(stdout).to.match(/error: option '--handler <path>' argument missing/);
+            done();
+          });
+        });
+      });
+    });
+
+    describe('--port', function() {
+      describe('missing value', function() {
+        it('should not return error', function(done) {
+          testOption(['--port'], function(stdout) {
+            expect(stdout).to.not.match(/error: option '--port <path>' argument missing/);
+            done();
+          });
+        });
+      });
+    });
+  });
+});
+
+/**
+ * Test Commander options in child process.
+ */
+function testOption(vals, callback) {
+  const file = path.resolve('server.js');
+  const args = vals.join(' ');
+
+  exec(`node '${file}' ${args}`, callback);
+}