diff --git a/lib/inquirer.js b/lib/inquirer.js
index 41e245613..196846520 100644
--- a/lib/inquirer.js
+++ b/lib/inquirer.js
@@ -23,8 +23,8 @@ inquirer.ui = {
  * Create a new self-contained prompt module.
  */
 inquirer.createPromptModule = function () {
-  var promptModule = function( questions, allDone ) {
-    var ui = new inquirer.ui.Prompt( promptModule.prompts );
+  var promptModule = function( questions, allDone, opt ) {
+    var ui = new inquirer.ui.Prompt( promptModule.prompts, opt );
     ui.run( questions, allDone );
     return ui;
   };
diff --git a/lib/ui/baseUI.js b/lib/ui/baseUI.js
index d1a2452c0..b5fd38320 100644
--- a/lib/ui/baseUI.js
+++ b/lib/ui/baseUI.js
@@ -5,6 +5,7 @@
 var _ = require("lodash");
 var tty = require("../utils/tty");
 var readlineFacade = require("readline2");
+var ttys = require("ttys");
 
 
 /**
@@ -18,9 +19,17 @@ module.exports = UI;
  */
 
 function UI( opt ) {
+  this._input = (opt && opt.input) || ttys.stdin;
+  this._output = (opt && opt.output) || ttys.stdout;
+
   // Instantiate the Readline interface
   // @Note: Don't reassign if already present (allow test to override the Stream)
-  this.rl || (this.rl = readlineFacade.createInterface());
+  if (!this.rl) {
+    this.rl = readlineFacade.createInterface({
+      input: this._input,
+      output: this._output
+    });
+  }
   this.rl.resume();
 
   this.onForceClose = this.onForceClose.bind(this);
@@ -31,7 +40,7 @@ function UI( opt ) {
   process.on( "exit", this.onForceClose );
 
   // Propagate keypress events directly on the readline
-  process.stdin.addListener( "keypress", this.onKeypress );
+  this._input.addListener( "keypress", this.onKeypress );
 }
 _.extend( UI.prototype, tty );
 
@@ -54,12 +63,12 @@ UI.prototype.onForceClose = function() {
 UI.prototype.close = function() {
   // Remove events listeners
   this.rl.removeListener( "SIGINT", this.onForceClose );
-  process.stdin.removeListener( "keypress", this.onKeypress );
+  this._input.removeListener( "keypress", this.onKeypress );
   process.removeListener( "exit", this.onForceClose );
 
   // Restore prompt functionnalities
   this.rl.output.unmute();
-  process.stdout.write("\x1B[?25h"); // show cursor
+  this._output.write("\x1B[?25h"); // show cursor
 
   // Close the readline
   this.rl.output.end();
diff --git a/lib/ui/prompt.js b/lib/ui/prompt.js
index a4990840d..0a3a4bca7 100644
--- a/lib/ui/prompt.js
+++ b/lib/ui/prompt.js
@@ -22,8 +22,8 @@ module.exports = PromptUI;
  * Constructor
  */
 
-function PromptUI( prompts ) {
-  Base.call(this);
+function PromptUI( prompts, opt ) {
+  Base.call(this, opt);
   this.prompts = prompts;
 }
 util.inherits( PromptUI, Base );
diff --git a/package.json b/package.json
index 7f6aff748..eca9d2062 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,8 @@
     "mute-stream": "0.0.4",
     "readline2": "~0.1.0",
     "rx": "2.2.27",
-    "through": "~2.3.4"
+    "through": "~2.3.4",
+    "ttys": "0.0.3"
   },
   "devDependencies": {
     "chai": "^1.10.0",