Added test for occurrences on abstract keyword

Author: DickvdBrink

tests/cases/fourslash/getOccurrencesAbstract.ts

@@ -0,0 +1,20 @@
+/// <reference path='fourslash.ts' />
+
+////[|abstract|] class Animal {
+////    [|abstract|] walk(): void;
+////    [|abstract|] makeSound(): void;
+////}
+////// Abstract class below should not get highlighted
+////abstract class Foo {
+////    abstract foo(): void;
+////    abstract bar(): void;
+////}
+
+test.ranges().forEach(r => {
+    goTo.position(r.start);
+    verify.occurrencesAtPositionCount(test.ranges().length);
+
+    test.ranges().forEach(range => {
+        verify.occurrencesAtPositionContains(range, false);
+    });
+});