1 files changed, 93 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Class/superPropOrdering.js b/js/src/tests/ecma_6/Class/superPropOrdering.js
new file mode 100644
index 000000000..1374d52c1
--- /dev/null
+++ b/js/src/tests/ecma_6/Class/superPropOrdering.js
@@ -0,0 +1,93 @@
+class base {
+    constructor() { }
+    method() { this.methodCalled++; }
+}
+
+class derived extends base {
+    constructor() { super(); this.methodCalled = 0; }
+
+    // Test orderings of various evaluations relative to the superbase
+
+    // Unlike in regular element evaluation, the propVal is evaluated before
+    // checking the starting object ([[HomeObject]].[[Prototype]])
+    testElem() { super[ruin()]; }
+
+    // The starting object for looking up super.method is determined before
+    // ruin() is called.
+    testProp() { super.method(ruin()); }
+
+    // The entire super.method property lookup has concluded before the args
+    // are evaluated
+    testPropCallDeleted() { super.method(()=>delete base.prototype.method); }
+
+    // The starting object for looking up super["prop"] is determined before
+    // ruin() is called.
+    testElemAssign() { super["prop"] = ruin(); }
+
+    // Test the normal assignment gotchas
+    testAssignElemPropValChange() {
+        let x = "prop1";
+        super[x] = (()=>(x = "prop2", 0))();
+        assertEq(this.prop1, 0);
+        assertEq(this.prop2, undefined);
+    }
+
+    testAssignProp() {
+        Object.defineProperty(base.prototype, "piggy",
+            {
+              configurable: true,
+              set() { throw "WEE WEE WEE WEE"; }
+            });
+
+        // The property lookup is noted, but not actually evaluated, until the
+        // right hand side is. Please don't make the piggy cry.
+        super.piggy = (() => delete base.prototype.piggy)();
+    }
+    testCompoundAssignProp() {
+        let getterCalled = false;
+        Object.defineProperty(base.prototype, "horse",
+            {
+              configurable: true,
+              get() { getterCalled = true; return "Of course"; },
+              set() { throw "NO!"; }
+            });
+        super.horse += (()=>(delete base.prototype.horse, ", of course!"))();
+        assertEq(getterCalled, true);
+
+        // So, is a horse a horse?
+        assertEq(this.horse, "Of course, of course!");
+    }
+}
+
+function ruin() {
+    Object.setPrototypeOf(derived.prototype, null);
+    return 5;
+}
+
+function reset() {
+    Object.setPrototypeOf(derived.prototype, base.prototype);
+}
+
+let instance = new derived();
+assertThrowsInstanceOf(() => instance.testElem(), TypeError);
+reset();
+
+instance.testProp();
+assertEq(instance.methodCalled, 1);
+reset();
+
+instance.testPropCallDeleted();
+assertEq(instance.methodCalled, 2);
+
+instance.testElemAssign();
+assertEq(instance.prop, 5);
+reset();
+
+instance.testAssignElemPropValChange();
+
+instance.testAssignProp();
+
+instance.testCompoundAssignProp();
+
+if (typeof reportCompare === 'function')
+    reportCompare(0,0,"OK");