From 9a675675cc760da943f2cde2b091f5b4af3b2b37 Mon Sep 17 00:00:00 2001
From: rosskaff <rosskaff@gmail.com>
Date: Sun, 24 Jan 2010 14:10:57 -0500
Subject: [PATCH] Add 'be_instance_of' matcher

---
 lib/screw.css         |  8 ++++++--
 lib/screw.matchers.js | 10 ++++++++++
 spec/matchers_spec.js | 25 +++++++++++++++++++++++++
 3 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/lib/screw.css b/lib/screw.css
index e277b65..5c0ce72 100644
--- a/lib/screw.css
+++ b/lib/screw.css
@@ -3,7 +3,12 @@ html {
 	margin:0;
 	padding:0;
 	list-style-position:inside;
+	background-color: SeaGreen;
 }
+  body > div.describe {
+    margin:0 auto;
+    width:75%;
+  }
 
   li {
     list-style-type: none;
@@ -87,14 +92,13 @@ html {
           }
 
           .describes .describe .its .it.failed h2 {
-            background-color: #993300;
+            background-color: #EE5757;
             color: white !important;
           }
 
           .describes .describe .its .it.failed p {
             margin-left: 1em;
             color: #993300;
-          	background-color:#EE5757;
           }
           
           .describes .describe .its .it h2:hover {
diff --git a/lib/screw.matchers.js b/lib/screw.matchers.js
index 82784b0..0415c8e 100644
--- a/lib/screw.matchers.js
+++ b/lib/screw.matchers.js
@@ -249,6 +249,16 @@ Screw.Matchers = (function($) {
       failure_message: function(expected, actual, not) {
         return 'expected ' + $.print(actual) + (not ? ' to not contain selector ' : ' to contain selector ') + expected;
       }
+    },
+    
+    be_instance_of: {
+      match: function(expected, actual) {
+        return (actual instanceof expected);
+      },
+
+      failure_message: function(expected, actual, not) {
+        return 'expected instance of ' + $.print(expected.toString());
+      }
     }
   };
 })(jQuery);
diff --git a/spec/matchers_spec.js b/spec/matchers_spec.js
index 19b9c0f..b574e9c 100644
--- a/spec/matchers_spec.js
+++ b/spec/matchers_spec.js
@@ -136,6 +136,31 @@ Screw.Unit(function() {
       });
     });
 
+    describe('#be_instance_of', function() {
+      var TestClass = function() {};
+      
+      it('matches an instance of given function', function () {
+        expect(new TestClass()).to(be_instance_of, TestClass);
+      });
+
+      it('does not match an instance unrelated function', function () {
+        expect(new RegExp()).to_not(be_instance_of, TestClass);
+      });
+
+      // describe(".failure_message", function() {
+      //   it('prints "expected [actual] to be an instance of [expected]', function() {
+      //     try { expect(new TestClass()).to(be_instance_of, RegExp); } catch(e) { message = e; }
+      //     expect(message).to(equal, '');
+      //   });
+      // 
+      //   it('prints "expected [actual] to not be an instance of [expected]', function() {
+      //     var message = null;
+      //     try { expect(new TestClass()).to_not(be_instance_of, TestClass); } catch(e) { message = e; }
+      //     expect(message).to(equal, 'expected [ new "TestClass" ] to be an instance of "TestClass"');
+      //   });
+      });
+    });
+
     describe('#be_empty', function() {
       it("matches Arrays with no elements", function() {
         expect([]).to(be_empty);