added test for matched pair deletion

Author: retailcoder

RubberduckTests/AutoComplete/SelfClosingPairHandlerTests.cs

@@ -100,8 +100,19 @@ public void GivenOpeningParenthesisOnOtherwiseNonEmptyLine_ReturnsFalseAndSwallo
             var info = new SelfClosingPairTestInfo(original, input, rePrettified);
 
             Assert.IsFalse(Run(info));
-            Assert.IsNull(info.Result);
             Assert.IsTrue(info.Args.Handled);
         }
+
+        [Test]
+        public void GivenBackspaceOnMatchedPair_DeletesMatchingTokens()
+        {
+            var input = '\b';
+            var original = "foo = DateSerial(Year(|))".ToCodeString();
+            var rePrettified = "foo = DateSerial(Year|)".ToCodeString();
+            var info = new SelfClosingPairTestInfo(original, input, rePrettified);
+
+            Assert.IsTrue(Run(info));
+            Assert.IsNotNull(info.Result);
+        }
     }
 }