1 files changed, 49 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/jaeger/inline/stringCharAt.js b/js/src/jit-test/tests/jaeger/inline/stringCharAt.js
new file mode 100644
index 0000000000..bf2bbbd67f
--- /dev/null
+++ b/js/src/jit-test/tests/jaeger/inline/stringCharAt.js
@@ -0,0 +1,49 @@
+
+assertEq("foo".charAt(-123), "");
+assertEq("foo".charAt(-1), "");
+assertEq("foo".charAt(0), "f");
+assertEq("foo".charAt(1), "o");
+assertEq("foo".charAt(2), "o");
+assertEq("foo".charAt(3.4), "");
+assertEq("foo".charAt(), "f");
+assertEq("".charAt(), "");
+assertEq("".charAt(0), "");
+assertEq("abc\u9123".charAt(3), "\u9123"); // char without unit string
+
+/* Inferred as string.charAt(int). */
+function charAt1(x) {
+    return "abc".charAt(x);
+}
+assertEq(charAt1(-1), "");
+assertEq(charAt1(0), "a");
+assertEq(charAt1(1), "b");
+assertEq(charAt1(2), "c");
+assertEq(charAt1(3), "");
+assertEq(charAt1(1234), "");
+
+/* Inferred as string.charAt(double). */
+function charAt2(x) {
+    return "abc".charAt(x);
+}
+assertEq(charAt2(-1.3), "");
+assertEq(charAt2(-0), "a");
+assertEq(charAt2(2), "c");
+assertEq(charAt2(2.3), "c");
+assertEq(charAt2(3.14), "");
+assertEq(charAt2(NaN), "a");
+
+/* Test ropes. */
+function charAt3(s, i) {
+    var s2 = "abcdef" + s + "12345";
+    return s2.charAt(i);
+}
+assertEq(charAt3("abcdef", 14), "3");
+assertEq(charAt3("a" + "b", 1), "b");
+assertEq(charAt3("abcdefg" + "hijklmnop", 10), "e");
+
+/* Other 'this'. */
+var arr = [1, 2];
+arr.charAt = String.prototype.charAt;
+assertEq(arr.charAt(1), ",");
+
+