1 files changed, 48 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/expressions/new/spread-obj-overrides-prev-properties.js b/js/src/tests/test262/language/expressions/new/spread-obj-overrides-prev-properties.js
new file mode 100644
index 0000000000..fbdbb8719b
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/new/spread-obj-overrides-prev-properties.js
@@ -0,0 +1,48 @@
+// This file was procedurally generated from the following sources:
+// - src/spread/obj-overrides-prev-properties.case
+// - src/spread/default/member-expr.template
+/*---
+description: Object Spread properties overrides previous definitions (`new` operator)
+esid: sec-new-operator-runtime-semantics-evaluation
+features: [object-spread]
+flags: [generated]
+info: |
+    MemberExpression : new MemberExpression Arguments
+
+    1. Return EvaluateNew(MemberExpression, Arguments).
+
+    12.3.3.1.1 Runtime Semantics: EvaluateNew
+
+    6. If arguments is empty, let argList be an empty List.
+    7. Else,
+       a. Let argList be ArgumentListEvaluation of arguments.
+       [...]
+
+    Pending Runtime Semantics: PropertyDefinitionEvaluation
+
+    PropertyDefinition:...AssignmentExpression
+
+    1. Let exprValue be the result of evaluating AssignmentExpression.
+    2. Let fromValue be GetValue(exprValue).
+    3. ReturnIfAbrupt(fromValue).
+    4. Let excludedNames be a new empty List.
+    5. Return CopyDataProperties(object, fromValue, excludedNames).
+
+---*/
+let o = {a: 2, b: 3};
+
+
+var callCount = 0;
+
+new function(obj) {
+  assert.sameValue(obj.a, 2);
+  assert.sameValue(obj.b, 3);
+  assert.sameValue(Object.keys(obj).length, 2);
+  assert.sameValue(o.a, 2);
+  assert.sameValue(o.b, 3);
+  callCount += 1;
+}({a: 1, b: 7, ...o});
+
+assert.sameValue(callCount, 1);
+
+reportCompare(0, 0);