1 files changed, 59 insertions, 0 deletions
diff --git a/js/src/tests/non262/TypedArray/from_this.js b/js/src/tests/non262/TypedArray/from_this.js
new file mode 100644
index 0000000000..95af053b8d
--- /dev/null
+++ b/js/src/tests/non262/TypedArray/from_this.js
@@ -0,0 +1,59 @@
+for (var constructor of anyTypedArrayConstructors) {
+    // The third argument to %TypedArray%.from is passed as the 'this' value to the
+    // mapping function.
+    var hits = 0, obj = {};
+    function f(x) {
+        assertEq(this, obj);
+        hits++;
+    }
+    constructor.from(["a", "b", "c"], f, obj);
+    assertEq(hits, 3);
+
+    // Without an argument, undefined is passed...
+    hits = 0;
+    function gs(x) {
+        "use strict";
+        assertEq(this, undefined);
+        hits++;
+    }
+    constructor.from("def", gs);
+    assertEq(hits, 3);
+
+    // ...and if the mapping function is non-strict, that means the global is
+    // passed.
+    var global = this;
+    hits = 0;
+    function g(x) {
+        assertEq(this, global);
+        hits++;
+    }
+    constructor.from("ghi", g);
+    assertEq(hits, 3);
+
+    // A primitive value can be passed.
+    for (var v of [0, "str", undefined]) {
+        hits = 0;
+        var mapfn = function h(x) {
+            "use strict";
+            assertEq(this, v);
+            hits++;
+        };
+        constructor.from("pq", mapfn, v);
+        assertEq(hits, 2);
+    }
+
+    // ...and if the mapping function is non-strict, primitive values will
+    // be wrapped to objects.
+    for (var v of [0, "str", true]) {
+        hits = 0;
+        var mapfn = function h(x) {
+            assertDeepEq(this, Object(v));
+            hits++;
+        };
+        constructor.from("pq", mapfn, v);
+        assertEq(hits, 2);
+    }
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);