1 files changed, 38 insertions, 0 deletions
diff --git a/js/src/tests/non262/class/strictExecution.js b/js/src/tests/non262/class/strictExecution.js
new file mode 100644
index 0000000000..f459311e55
--- /dev/null
+++ b/js/src/tests/non262/class/strictExecution.js
@@ -0,0 +1,38 @@
+// Classes are always strict mode. Check computed property names and heritage
+// expressions as well.
+
+class a { constructor() { Object.preventExtensions({}).prop = 0; } }
+assertThrowsInstanceOf(() => new a(), TypeError);
+var aExpr = class { constructor() { Object.preventExtensions().prop = 0; } };
+assertThrowsInstanceOf(() => new aExpr(), TypeError);
+
+function shouldThrowCPN() {
+    class b {
+        [Object.preventExtensions({}).prop = 4]() { }
+        constructor() { }
+    }
+}
+function shouldThrowCPNExpr() {
+    var b = class {
+        [Object.preventExtensions({}).prop = 4]() { }
+        constructor() { }
+    };
+}
+assertThrowsInstanceOf(shouldThrowCPN, TypeError);
+assertThrowsInstanceOf(shouldThrowCPNExpr, TypeError);
+
+function shouldThrowHeritage() {
+    class b extends (Object.preventExtensions({}).prop = 4) {
+        constructor() { }
+    }
+}
+function shouldThrowHeritageExpr() {
+    var b = class extends (Object.preventExtensions({}).prop = 4) {
+        constructor() { }
+    };
+}
+assertThrowsInstanceOf(shouldThrowHeritage, TypeError);
+assertThrowsInstanceOf(shouldThrowHeritageExpr, TypeError);
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0, "OK");