Fix buffer diffs (closes mochajs#1132, closes mochajs#1433)

lib/utils.js

@@ -306,6 +306,16 @@ exports.stringify = function(obj) {
   return JSON.stringify(exports.canonicalize(obj), null, 2).replace(/,(\n|$)/g, '$1');
 };
 
+/**
+ * Return if obj is a Buffer
+ * @param {Object} arg
+ * @return {Boolean}
+ * @api private
+ */
+exports.isBuffer = function (arg) {
+  return typeof Buffer !== 'undefined' && arg instanceof Buffer;
+};
+
 /**
  * Return a new object that has the keys in sorted order.
  * @param {Object} obj
@@ -321,7 +331,9 @@ exports.canonicalize = function(obj, stack) {
 
   var canonicalizedObj;
 
-  if ({}.toString.call(obj) === '[object Array]') {
+  if(exports.isBuffer(obj)) {
+    return obj;
+  } else if ({}.toString.call(obj) === '[object Array]') {
     stack.push(obj);
     canonicalizedObj = exports.map(obj, function (item) {
       return exports.canonicalize(item, stack);

test/acceptance/diffs.js

@@ -83,4 +83,11 @@ describe('diffs', function(){
 
     // obj1.should.equal(obj2);
   });
+
+  it('should display diff by data and not like an objects', function(){
+    var buf1 = new Buffer([0x01]);
+    var buf2 = new Buffer([0x02]);
+
+//    buf1.should.equal(buf2);
+  });
 });

test/utils.js

@@ -1,19 +1,26 @@
 var mocha = require('..');
 var utils = mocha.utils;
 var clean = utils.clean;
+var isBuffer = utils.isBuffer;
 
-describe('utils', function(){
+describe('utils', function() {
   describe('.clean()', function(){
     it('should remove the wrapping function declaration', function(){
       clean('function  (one, two, three)  {\n//code\n}').should.equal('//code');
-    })
+    });
 
     it('should remove space character indentation from the function body', function(){
       clean('  //line1\n    //line2').should.equal('//line1\n  //line2');
-    })
+    });
 
     it('should remove tab character indentation from the function body', function(){
       clean('\t//line1\n\t\t//line2').should.equal('//line1\n\t//line2');
+    });
+  });
+  describe('.isBuffer()', function(){
+    it('should test if object is a Buffer', function() {
+      isBuffer(new Buffer([0x01])).should.equal(true);
+      isBuffer({}).should.equal(false);
     })
-  })
-})
+  });
+});