JS: Add: test cases for find, findLast, findLastIndex with callbacks

Author: Napalys

javascript/ql/test/library-tests/Arrays/DataFlow.expected

@@ -26,3 +26,5 @@
 | arrays.js:53:4:53:11 | "source" | arrays.js:54:10:54:18 | ary.pop() |
 | arrays.js:99:31:99:38 | "source" | arrays.js:100:8:100:17 | arr8.pop() |
 | arrays.js:103:55:103:62 | "source" | arrays.js:105:8:105:25 | arr8_variant.pop() |
+| arrays.js:114:19:114:26 | "source" | arrays.js:116:10:116:16 | element |
+| arrays.js:120:19:120:26 | "source" | arrays.js:122:10:122:16 | element |

javascript/ql/test/library-tests/Arrays/TaintFlow.expected

@@ -30,3 +30,5 @@
 | arrays.js:96:9:96:16 | "source" | arrays.js:96:8:96:36 | ["sourc ... => !!x) |
 | arrays.js:99:31:99:38 | "source" | arrays.js:100:8:100:17 | arr8.pop() |
 | arrays.js:103:55:103:62 | "source" | arrays.js:105:8:105:25 | arr8_variant.pop() |
+| arrays.js:114:19:114:26 | "source" | arrays.js:116:10:116:16 | element |
+| arrays.js:120:19:120:26 | "source" | arrays.js:122:10:122:16 | element |

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

@@ -109,4 +109,22 @@
   sink(arr8_spread.pop()); // NOT OK
 
   sink(arr.findLast(someCallback)); // NOT OK
+
+  {  // Test for findLast function
+    const list = ["source"];
+    const element = list.findLast((item) => sink(item)); // NOT OK -- Not caught, currently missing dataflow tracking.
+    sink(element); // NOT OK
+  }
+
+  {  // Test for find function
+    const list = ["source"];
+    const element = list.find((item) => sink(item)); // NOT OK -- Not caught, currently missing dataflow tracking.
+    sink(element); // NOT OK
+  }
+
+  {  // Test for findLastIndex function
+    const list = ["source"];
+    const element = list.findLastIndex((item) => sink(item)); // NOT OK -- Not caught, currently missing dataflow tracking.
+    sink(element); // OK
+  }
 });