Add failing test for #6274

Author: tommy9

RubberduckTests/Symbols/ToVbExpressionTests.cs

@@ -128,6 +128,17 @@ public void UnicodeUsesChrWCallWithHexNotation()
             Assert.AreEqual(expected, actual, "Expected {0}, actual was {1}", expected, actual);
         }
 
+        [Test]
+        [Category("String Extensions")]
+        public void UnicodeOverMaxInt16UsesChrWCallWithHexNotation()
+        {
+            var managed = "耀";
+            var expected = "ChrW$(&H8000)";
+            var actual = managed.ToVbExpression();
+
+            Assert.AreEqual(expected, actual, "Expected {0}, actual was {1}", expected, actual);
+        }
+        
         [Test]
         [Category("String Extensions")]
         public void MixedAsciiAndUnicodeUsesChrAndChrWConstFlagOff()