1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/expressions/array/spread-obj-override-immutable.js b/js/src/tests/test262/language/expressions/array/spread-obj-override-immutable.js
new file mode 100644
index 0000000000..3a97d624d1
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/array/spread-obj-override-immutable.js
@@ -0,0 +1,54 @@
+// This file was procedurally generated from the following sources:
+// - src/spread/obj-override-immutable.case
+// - src/spread/default/array.template
+/*---
+description: Object Spread overriding immutable properties (Array initializer)
+esid: sec-runtime-semantics-arrayaccumulation
+features: [object-spread]
+flags: [generated]
+includes: [propertyHelper.js]
+info: |
+    SpreadElement : ...AssignmentExpression
+
+    1. Let spreadRef be the result of evaluating AssignmentExpression.
+    2. Let spreadObj be ? GetValue(spreadRef).
+    3. Let iterator be ? GetIterator(spreadObj).
+    4. Repeat
+       a. Let next be ? IteratorStep(iterator).
+       b. If next is false, return nextIndex.
+       c. Let nextValue be ? IteratorValue(next).
+       d. Let status be CreateDataProperty(array, ToString(ToUint32(nextIndex)),
+          nextValue).
+       e. Assert: status is true.
+       f. Let nextIndex be nextIndex + 1.
+---*/
+
+let o = {b: 2};
+Object.defineProperty(o, "a", {value: 1, enumerable: true, writable: false, configurable: true});
+
+
+var callCount = 0;
+
+(function(obj) {
+  assert.sameValue(obj.a, 3)
+  assert.sameValue(obj.b, 2);
+
+  verifyProperty(obj, "a", {
+    enumerable: true,
+    writable: true,
+    configurable: true,
+    value: 3
+  });
+
+  verifyProperty(obj, "b", {
+    enumerable: true,
+    writable: true,
+    configurable: true,
+    value: 2
+  });
+  callCount += 1;
+}.apply(null, [{...o, a: 3}]));
+
+assert.sameValue(callCount, 1);
+
+reportCompare(0, 0);