1 files changed, 24 insertions, 0 deletions
diff --git a/js/src/tests/non262/TypedArray/from_string.js b/js/src/tests/non262/TypedArray/from_string.js
new file mode 100644
index 0000000000..09a2c36710
--- /dev/null
+++ b/js/src/tests/non262/TypedArray/from_string.js
@@ -0,0 +1,24 @@
+// %TypedArray%.from called on Array should also handle strings correctly.
+var from = Int8Array.from.bind(Uint32Array);
+var toCodePoint = s => s.codePointAt(0);
+
+// %TypedArray%.from on a string iterates over the string.
+assertEqArray(from("test string", toCodePoint),
+             ['t', 'e', 's', 't', ' ', 's', 't', 'r', 'i', 'n', 'g'].map(toCodePoint));
+
+// %TypedArray%.from on a string handles surrogate pairs correctly.
+var gclef = "\uD834\uDD1E"; // U+1D11E MUSICAL SYMBOL G CLEF
+assertEqArray(from(gclef, toCodePoint), [gclef].map(toCodePoint));
+assertEqArray(from(gclef + " G", toCodePoint), [gclef, " ", "G"].map(toCodePoint));
+
+// %TypedArray%.from on a string calls the @@iterator method.
+String.prototype[Symbol.iterator] = function* () { yield 1; yield 2; };
+assertEqArray(from("anything"), [1, 2]);
+
+// If the iterator method is deleted, Strings are still arraylike.
+delete String.prototype[Symbol.iterator];
+assertEqArray(from("works", toCodePoint), ['w', 'o', 'r', 'k', 's'].map(toCodePoint));
+assertEqArray(from(gclef, toCodePoint), ['\uD834', '\uDD1E'].map(toCodePoint));
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);