Fixed method

Author: 3y3

test/cpu_cprofiler.js

@@ -185,8 +185,14 @@ describe('HEAP', function() {
     });
 
     it('should use control function, if started with function argument', function(done) {
+      // Fix for Windows
+      var checked = false;
       profiler.takeSnapshot(function(progress, total) {
-        if (progress === total) done();
+        if (progress === total) {
+          if (checked) return;
+          checked = true;
+          done();
+        }
       });
     });
 
@@ -261,6 +267,13 @@ describe('HEAP', function() {
       });
     });
 
+    it('should compare itself with other snapshot', function() {
+      var snapshot1 = profiler.takeSnapshot();
+      var snapshot2 = profiler.takeSnapshot();
+
+      expect(snapshot1.compare.bind(snapshot1, snapshot2)).to.not.throw();
+    });
+
   });
 
   function deleteAllSnapshots() {

v8-profiler.js

@@ -29,8 +29,8 @@ Snapshot.prototype.compare = function(other) {
   keys.forEach(function(key) {
     if (key in diff) return;
 
-    var selfCount = selfCounts[key] || 0,
-        otherCount = otherCounts[key] || 0;
+    var selfCount = selfHist[key] || 0,
+        otherCount = otherHist[key] || 0;
 
     diff[key] = otherCount - selfCount;
   });