1 files changed, 42 insertions, 0 deletions
diff --git a/js/src/tests/non262/TypedArray/from_basics.js b/js/src/tests/non262/TypedArray/from_basics.js
new file mode 100644
index 0000000000..9f53feb72d
--- /dev/null
+++ b/js/src/tests/non262/TypedArray/from_basics.js
@@ -0,0 +1,42 @@
+for (var constructor of anyTypedArrayConstructors) {
+    // 'from' method is identical for all typed array constructors.
+    assertEq(anyTypedArrayConstructors[0].from === constructor.from, true);
+
+    // %TypedArray%.from copies arrays.
+    var src = new constructor([1, 2, 3]), copy = constructor.from(src);
+    assertEq(copy === src, false);
+    assertEq(copy instanceof constructor, true);
+    assertDeepEq(copy, src);
+
+    // Non-element properties are not copied.
+    var a = new constructor([0, 1]);
+    a.name = "lisa";
+    assertDeepEq(constructor.from(a), new constructor([0, 1]));
+
+    // %TypedArray%.from can copy non-iterable objects, if they're array-like.
+    src = {0: 0, 1: 1, length: 2};
+    copy = constructor.from(src);
+    assertEq(copy instanceof constructor, true);
+    assertDeepEq(copy, new constructor([0, 1]));
+
+    // Properties past the .length are not copied.
+    src = {0: "0", 1: "1", 2: "two", 9: "nine", name: "lisa", length: 2};
+    assertDeepEq(constructor.from(src), new constructor([0, 1]));
+
+    // If an object has neither an @@iterator method nor .length,
+    // then it's treated as zero-length.
+    assertDeepEq(constructor.from({}), new constructor());
+
+    // Primitives will be coerced to primitive wrapper first.
+    assertDeepEq(constructor.from(1), new constructor());
+    assertDeepEq(constructor.from("123"), new constructor([1, 2, 3]));
+    assertDeepEq(constructor.from(true), new constructor());
+    assertDeepEq(constructor.from(Symbol()), new constructor());
+
+    // Source object property order doesn't matter.
+    src = {length: 2, 1: "1", 0: "0"};
+    assertDeepEq(constructor.from(src), new constructor([0, 1]));
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);