1 files changed, 88 insertions, 0 deletions
diff --git a/js/src/tests/non262/Array/group.js b/js/src/tests/non262/Array/group.js
new file mode 100644
index 0000000000..9e89d1889d
--- /dev/null
+++ b/js/src/tests/non262/Array/group.js
@@ -0,0 +1,88 @@
+function isNeg(x) {
+  if (Object.is(x, -0) || x < 0) {
+    return true;
+  }
+  return false;
+}
+
+{
+  const a1 = [-Infinity, -2, -1, -0, 0, 1, 2, Infinity];
+  const expectedObj = { neg: [-Infinity, -2, -1, -0], pos: [0, 1, 2, Infinity] };
+  Object.setPrototypeOf(expectedObj, null);
+
+  const groupedArray = Object.groupBy(a1, x => isNeg(x) ? 'neg' : 'pos');
+  const mappedArray = Map.groupBy(a1, x => isNeg(x) ? 'neg' : 'pos');
+
+  assertEq(Object.getPrototypeOf(groupedArray), null)
+  assertDeepEq(groupedArray, expectedObj);
+  assertDeepEq(mappedArray.get("neg"), expectedObj["neg"]);
+  assertDeepEq(mappedArray.get("pos"), expectedObj["pos"]);
+
+
+  const expectedObj2 = {"undefined": [1,2,3]}
+  Object.setPrototypeOf(expectedObj2, null);
+  assertDeepEq(Object.groupBy([1,2,3], () => {}), expectedObj2);
+  assertDeepEq(Object.groupBy([], () => {}), Object.create(null));
+  assertDeepEq((Map.groupBy([1,2,3], () => {})).get(undefined), [1,2,3]);
+  assertEq((Map.groupBy([1,2,3], () => {})).size, 1);
+
+  const negMappedArray = Map.groupBy(a1, x => isNeg(x) ? -0 : 0);
+  assertDeepEq(negMappedArray.get(0), a1);
+  assertDeepEq(negMappedArray.size, 1);
+
+  assertThrowsInstanceOf(() => Object.groupBy([], undefined), TypeError);
+  assertThrowsInstanceOf(() => Object.groupBy([], null), TypeError);
+  assertThrowsInstanceOf(() => Object.groupBy([], 0), TypeError);
+  assertThrowsInstanceOf(() => Object.groupBy([], ""), TypeError);
+  assertThrowsInstanceOf(() => Map.groupBy([], undefined), TypeError);
+  assertThrowsInstanceOf(() => Map.groupBy([], null), TypeError);
+  assertThrowsInstanceOf(() => Map.groupBy([], 0), TypeError);
+  assertThrowsInstanceOf(() => Map.groupBy([], ""), TypeError);
+}
+
+const array = [ 'test' ];
+Object.defineProperty(Map.prototype, 4, {
+  get() {
+    throw new Error('monkey-patched Map get call');
+  },
+  set(v) {
+    throw new Error('monkey-patched Map set call');
+  },
+  has(v) {
+    throw new Error('monkey-patched Map has call');
+  }
+});
+
+const map1 = Map.groupBy(array, key => key.length);
+
+assertEq('test', map1.get(4)[0])
+
+Object.defineProperty(Array.prototype, '4', {
+  set(v) {
+    throw new Error('user observable array set');
+  },
+  get() {
+    throw new Error('user observable array get');
+  }
+});
+
+const map2 = Map.groupBy(array, key => key.length);
+const arr = Object.groupBy(array, key => key.length);
+
+assertEq('test', map2.get(4)[0])
+assertEq('test', arr[4][0])
+
+Object.defineProperty(Object.prototype, "foo", {
+  get() { throw new Error("user observable object get"); },
+  set(v) { throw new Error("user observable object set"); }
+});
+Object.groupBy([1, 2, 3], () => 'foo');
+
+// Ensure property key is correctly accessed
+count = 0;
+p = Object.groupBy([1], () => ({ toString() { count++; return 10 } }));
+assertEq(count, 1);
+Map.groupBy([1], () => ({ toString() { count++; return 10 } }));
+assertEq(count, 1);
+
+reportCompare(0, 0);