From ddf5ce76a8c464d80f269149234c0dbb9e3e8172 Mon Sep 17 00:00:00 2001
From: Augusto Franzoia <ajfranzoia@gmail.com>
Date: Mon, 25 Jan 2016 01:39:38 -0300
Subject: [PATCH] Fail when using same command and alias

---
 index.js                             |  1 +
 test/test.command.failOnSameAlias.js | 14 ++++++++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 test/test.command.failOnSameAlias.js

diff --git a/index.js b/index.js
index 715c4df98..0c8aeeecc 100644
--- a/index.js
+++ b/index.js
@@ -851,6 +851,7 @@ Command.prototype.description = function(str) {
 
 Command.prototype.alias = function(alias) {
   if (0 == arguments.length) return this._alias;
+  if (alias === this._name) throw new Error('Command alias can\'t be the same as its name');
   this._alias = alias;
   return this;
 };
diff --git a/test/test.command.failOnSameAlias.js b/test/test.command.failOnSameAlias.js
new file mode 100644
index 000000000..6b7527631
--- /dev/null
+++ b/test/test.command.failOnSameAlias.js
@@ -0,0 +1,14 @@
+var program = require('../')
+  , should = require('should');
+
+var error;
+
+try {
+  program
+    .command('fail')
+    .alias('fail');
+} catch (e) {
+  error = e;
+}
+
+error.should.deepEqual(new Error('Command alias can\'t be the same as its name'));