JS: Add: missing similar test cases for Array.prototype.filter

Author: Napalys

javascript/ql/test/library-tests/Arrays/arrays.js

@@ -144,4 +144,16 @@
     const element1 = arr.findLastIndex((item) => sink(item)); // NOT OK
     sink(element1); // OK
   }
+
+  {  // Test for findLastIndex function
+    const list = ["source"];
+    const filtered = list.filter((item) => sink(item)); // NOT OK
+    sink(filtered); // OK
+  }
+
+  {
+    const arr = source();
+    const filtered = arr.filter((item) => sink(item)); // NOT OK
+    sink(filtered); // NOT OK
+  }
 });