Add m-esr52 at 52.6.0

1 files changed, 80 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Reflect/deleteProperty.js b/js/src/tests/ecma_6/Reflect/deleteProperty.js
new file mode 100644
index 000000000..744e0f571
--- /dev/null
+++ b/js/src/tests/ecma_6/Reflect/deleteProperty.js
@@ -0,0 +1,80 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/ */
+
+// Reflect.deleteProperty deletes properties.
+var obj = {x: 1, y: 2};
+assertEq(Reflect.deleteProperty(obj, "x"), true);
+assertDeepEq(obj, {y: 2});
+
+var arr = [1, 1, 2, 3, 5];
+assertEq(Reflect.deleteProperty(arr, "3"), true);
+assertDeepEq(arr, [1, 1, 2, , 5]);
+
+
+// === Failure and error cases
+// Since Reflect.deleteProperty is almost exactly identical to the non-strict
+// `delete` operator, there is not much to test that would not be redundant.
+
+// Returns true if no such property exists.
+assertEq(Reflect.deleteProperty({}, "q"), true);
+
+// Or if it's inherited.
+var proto = {x: 1};
+assertEq(Reflect.deleteProperty(Object.create(proto), "x"), true);
+assertEq(proto.x, 1);
+
+// Return false if asked to delete a non-configurable property.
+var arr = [];
+assertEq(Reflect.deleteProperty(arr, "length"), false);
+assertEq(arr.hasOwnProperty("length"), true);
+assertEq(Reflect.deleteProperty(this, "undefined"), false);
+assertEq(this.undefined, void 0);
+
+// Return false if a Proxy's deleteProperty handler returns a false-y value.
+var value;
+var proxy = new Proxy({}, {
+    deleteProperty(t, k) {
+        return value;
+    }
+});
+for (value of [true, false, 0, "something", {}]) {
+    assertEq(Reflect.deleteProperty(proxy, "q"), !!value);
+}
+
+// If a Proxy's handler method throws, the error is propagated.
+proxy = new Proxy({}, {
+    deleteProperty(t, k) { throw "vase"; }
+});
+assertThrowsValue(() => Reflect.deleteProperty(proxy, "prop"), "vase");
+
+// Throw a TypeError if a Proxy's handler method returns true in violation of
+// the object invariants.
+proxy = new Proxy(Object.freeze({prop: 1}), {
+    deleteProperty(t, k) { return true; }
+});
+assertThrowsInstanceOf(() => Reflect.deleteProperty(proxy, "prop"), TypeError);
+
+
+// === Deleting elements from `arguments`
+
+// Non-strict arguments element becomes unmapped
+function f(x, y, z) {
+    assertEq(Reflect.deleteProperty(arguments, "0"), true);
+    arguments.x = 33;
+    return x;
+}
+assertEq(f(17, 19, 23), 17);
+
+// Frozen non-strict arguments element
+function testFrozenArguments() {
+    Object.freeze(arguments);
+    assertEq(Reflect.deleteProperty(arguments, "0"), false);
+    assertEq(arguments[0], "zero");
+    assertEq(arguments[1], "one");
+}
+testFrozenArguments("zero", "one");
+
+
+// For more Reflect.deleteProperty tests, see target.js and propertyKeys.js.
+
+reportCompare(0, 0);