1 files changed, 80 insertions, 0 deletions
diff --git a/js/src/tests/ecma_7/TypedObject/structtypeprototype.js b/js/src/tests/ecma_7/TypedObject/structtypeprototype.js
new file mode 100644
index 000000000..b54ff4249
--- /dev/null
+++ b/js/src/tests/ecma_7/TypedObject/structtypeprototype.js
@@ -0,0 +1,80 @@
+// |reftest| skip-if(!this.hasOwnProperty("TypedObject"))
+var BUGNUMBER = 578700;
+var summary = 'TypedObjects StructType prototype chains';
+
+var ArrayType = TypedObject.ArrayType;
+var StructType = TypedObject.StructType;
+var uint8 = TypedObject.uint8;
+var uint16 = TypedObject.uint16;
+var uint32 = TypedObject.uint32;
+var uint8Clamped = TypedObject.uint8Clamped;
+var int8 = TypedObject.int8;
+var int16 = TypedObject.int16;
+var int32 = TypedObject.int32;
+var float32 = TypedObject.float32;
+var float64 = TypedObject.float64;
+
+function runTests() {
+  var RgbColor1 = new StructType({r: uint8, g: uint8, b: uint8});
+  var RgbColor2 = new StructType({r: uint8, g: uint8, b: uint8});
+  var Fade1 = new StructType({from: RgbColor1, to: RgbColor1});
+  var Fade2 = new StructType({from: RgbColor2, to: RgbColor2});
+
+  // Available on all struct types (even though it would only make
+  // sense on a RgbColor1 or RgbColor2 instance)
+  StructType.prototype.prototype.sub = function(c) {
+    this.r -= c;
+    this.g -= c;
+    this.b -= c;
+  };
+
+  // Available on `RgbColor2` instances only
+  RgbColor2.prototype.add = function(c) {
+    this.r += c;
+    this.g += c;
+    this.b += c;
+  };
+
+  var black = new RgbColor1({r: 0, g: 0, b: 0});
+  var gray = new RgbColor2({r: 129, g: 128, b: 127});
+
+  // `add` works on `RgbColor2`
+  assertThrows(function() { black.add(1); });
+  gray.add(1);
+  assertEq(130, gray.r);
+  assertEq(129, gray.g);
+  assertEq(128, gray.b);
+
+  // `add` fails (for both!) when accessed via `fade1`
+  var fade1 = new Fade1({from: black, to: gray});
+  assertThrows(function() { fade1.from.add(1); });
+  assertThrows(function() { fade1.to.add(1); });
+
+  // `sub` works on both
+  black.sub(1);
+  assertEq(black.r, 255);
+  assertEq(black.g, 255);
+  assertEq(black.b, 255);
+  gray.sub(1);
+  assertEq(gray.r, 129);
+  assertEq(gray.g, 128);
+  assertEq(gray.b, 127);
+
+  // `add` works (for both!) when accessed via `fade2`
+  var fade2 = new Fade2(fade1);
+  fade2.from.add(1);
+  assertEq(fade2.from.r, 1);
+  assertEq(fade2.from.g, 1);
+  assertEq(fade2.from.b, 1);
+  fade2.to.add(1);
+  assertEq(fade2.to.r, 131);
+  assertEq(fade2.to.g, 130);
+  assertEq(fade2.to.b, 129);
+
+  reportCompare(true, true);
+  print("Tests complete");
+}
+
+runTests();
+
+