1 files changed, 135 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/object-assign.js b/js/src/jit-test/tests/basic/object-assign.js
new file mode 100644
index 0000000000..0b1297849a
--- /dev/null
+++ b/js/src/jit-test/tests/basic/object-assign.js
@@ -0,0 +1,135 @@
+function test() {
+    var from, to;
+
+    // Property changes value.
+    from = {x: 1, y: 2};
+    to = {set x(v) { from.y = 5; }};
+    Object.assign(to, from);
+    assertEq(to.y, 5);
+
+    // Property becomes a getter.
+    from = {x: 1, y: 2};
+    to = {set x(v) { Object.defineProperty(from, "y", {get: () => 4}); }};
+    Object.assign(to, from);
+    assertEq(to.y, 4);
+
+    // Property becomes non-enumerable.
+    from = {x: 1, y: 2};
+    to = {set x(v) { Object.defineProperty(from, "y", {value: 2,
+						       enumerable: false,
+						       configurable: true,
+						       writable: true}); }};
+    Object.assign(to, from);
+    assertEq("y" in to, false);
+    to = {};
+    Object.assign(to, from);
+    assertEq("y" in to, false);
+
+    // Property is deleted. Should NOT get Object.prototype.toString.
+    from = {x: 1, toString: 2};
+    to = {set x(v) { delete from.toString; }};
+    Object.assign(to, from);
+    assertEq(to.hasOwnProperty("toString"), false);
+
+    from = {toString: 2, x: 1};
+    to = {set x(v) { delete from.toString; }};
+    Object.assign(to, from);
+    assertEq(to.toString, 2);
+
+    from = {x: 1, toString: 2, y: 3};
+    to = {set x(v) { delete from.toString; }};
+    Object.assign(to, from);
+    assertEq(to.hasOwnProperty("toString"), false);
+    assertEq(to.y, 3);
+
+    // New property is added.
+    from = {x: 1, y: 2};
+    to = {set x(v) { from.z = 3; }};
+    Object.assign(to, from);
+    assertEq("z" in to, false);
+
+    // From getter.
+    var c = 7;
+    from = {x: 1, get y() { return ++c; }};
+    to = {};
+    Object.assign(to, from);
+    Object.assign(to, from, from);
+    assertEq(to.y, 10);
+
+    // Frozen object.
+    from = {x: 1, y: 2};
+    to = {x: 4};
+    Object.freeze(to);
+    var ex;
+    try {
+	Object.assign(to, from);
+    } catch (e) {
+	ex = e;
+    }
+    assertEq(ex instanceof TypeError, true);
+    assertEq(to.x, 4);
+
+    // Non-writable property.
+    from = {x: 1, y: 2, z: 3};
+    to = {};
+    Object.defineProperty(to, "y", {value: 9, writable: false});
+    ex = null;
+    try {
+	Object.assign(to, from);
+    } catch(e) {
+	ex = e;
+    }
+    assertEq(ex instanceof TypeError, true);
+    assertEq(to.x, 1);
+    assertEq(to.y, 9);
+    assertEq(to.z, undefined);
+
+    // Array with dense elements.
+    from = [1, 2, 3];
+    to = {};
+    Object.assign(to, from);
+    assertEq(to[2], 3);
+    assertEq("length" in to, false);
+
+    // Object with sparse elements and symbols.
+    from = {x: 1, 1234567: 2,  1234560: 3,[Symbol.iterator]: 5, z: 3};
+    to = {};
+    Object.assign(to, from);
+    assertEq(to[1234567], 2);
+    assertEq(Object.keys(to).toString(), "1234560,1234567,x,z");
+    assertEq(to[Symbol.iterator], 5);
+
+    // Symbol properties need to be assigned last.
+    from = {x: 1, [Symbol.iterator]: 2, y: 3};
+    to = {set y(v) { throw 9; }};
+    ex = null;
+    try {
+	Object.assign(to, from);
+    } catch (e) {
+	ex = e;
+    }
+    assertEq(ex, 9);
+    assertEq(to.x, 1);
+    assertEq(to.hasOwnProperty(Symbol.iterator), false);
+
+    // Typed array.
+    from = new Int32Array([1, 2, 3]);
+    to = {};
+    Object.assign(to, from);
+    assertEq(to[1], 2);
+
+    // Primitive string.
+    from = "foo";
+    to = {};
+    Object.assign(to, from);
+    assertEq(to[0], "f");
+
+    // String object.
+    from = new String("bar");
+    to = {};
+    Object.assign(to, from);
+    assertEq(to[2], "r");
+}
+test();
+test();
+test();