diff --git a/tests/cases/unittests/incrementalParser.ts b/tests/cases/unittests/incrementalParser.ts
index 44fa9f4a693..89c350084e6 100644
--- a/tests/cases/unittests/incrementalParser.ts
+++ b/tests/cases/unittests/incrementalParser.ts
@@ -200,7 +200,7 @@ module ts {
             compareTrees(oldText, newTextAndChange.text, newTextAndChange.textChangeRange, 0);
         });
 
-        it('Regular comment 1',() => {
+        it('Comment 1',() => {
             var source = "class C { public foo1() { /; } public foo2() { return 1; } public foo3() { } }";
 
             var semicolonIndex = source.indexOf(";");
@@ -209,5 +209,14 @@ module ts {
 
             compareTrees(oldText, newTextAndChange.text, newTextAndChange.textChangeRange, 0);
         });
+
+        it('Comment 2',() => {
+            var source = "class C { public foo1() { /; } public foo2() { return 1; } public foo3() { } }";
+
+            var oldText = ScriptSnapshot.fromString(source);
+            var newTextAndChange = withInsert(oldText, 0, "//");
+
+            compareTrees(oldText, newTextAndChange.text, newTextAndChange.textChangeRange, 0);
+        });
     });
 }
\ No newline at end of file