added unit test

TheLartians · TheLartians · commit d21091d059fe · 2018-11-30T14:25:56.000+01:00
diff --git a/test/unit/array.spec.ts b/test/unit/array.spec.ts
@@ -38,4 +38,17 @@ export class ArrayTests {
         const result = util.executeLua(lua);
         Expect(result).toBe(5);
     }
+
+    @Test("Derived array access")
+    public derivedArrayAccess(): void {
+        const lua = `local arr = {firstElement=function(self) return self[1]; end};`
+        +  util.transpileString(
+            `interface CustomArray extends Array<number>{ firstElement():number; };
+            declare const arr: CustomArray;
+            arr[0] = 3;
+            return arr.firstElement();`
+        );
+        const result = util.executeLua(lua);
+        Expect(result).toBe(3);
+    }
 }
