1 files changed, 99 insertions, 0 deletions
diff --git a/js/src/tests/non262/String/string-pad-start-end.js b/js/src/tests/non262/String/string-pad-start-end.js
new file mode 100644
index 0000000000..d784c83e0d
--- /dev/null
+++ b/js/src/tests/non262/String/string-pad-start-end.js
@@ -0,0 +1,99 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+// `this` must be object coercable.
+
+for (let badThis of [null, undefined]) {
+    assertThrowsInstanceOf(() => {
+        String.prototype.padStart.call(badThis, 42, "oups");
+    }, TypeError);
+
+    assertThrowsInstanceOf(() => {
+        String.prototype.padEnd.call(badThis, 42, "oups");
+    }, TypeError);
+}
+
+let proxy = new Proxy({}, {
+get(t, name) {
+  if (name === Symbol.toPrimitive || name === "toString") return;
+  if (name === "valueOf") return () => 42;
+  throw "This should not be reachable";
+}
+});
+
+assertEq("42bloop", String.prototype.padEnd.call(proxy, 7, "bloopie"));
+
+// maxLength must convert to an integer
+
+assertEq("lame", "lame".padStart(0, "foo"));
+assertEq("lame", "lame".padStart(0.1119, "foo"));
+assertEq("lame", "lame".padStart(-0, "foo"));
+assertEq("lame", "lame".padStart(NaN, "foo"));
+assertEq("lame", "lame".padStart(-1, "foo"));
+assertEq("lame", "lame".padStart({toString: () => 0}, "foo"));
+
+assertEq("lame", "lame".padEnd(0, "foo"));
+assertEq("lame", "lame".padEnd(0.1119, "foo"));
+assertEq("lame", "lame".padEnd(-0, "foo"));
+assertEq("lame", "lame".padEnd(NaN, "foo"));
+assertEq("lame", "lame".padEnd(-1, "foo"));
+assertEq("lame", "lame".padEnd({toString: () => 0}, "foo"));
+
+assertThrowsInstanceOf(() => {
+    "lame".padStart(Symbol("9900"), 0);
+}, TypeError);
+
+assertThrowsInstanceOf(() => {
+    "lame".padEnd(Symbol("9900"), 0);
+}, TypeError);
+
+// The fill argument must be string coercable.
+
+assertEq("nulln.", ".".padStart(6, null));
+assertEq(".nulln", ".".padEnd(6, null));
+
+assertEq("[obje.", ".".padStart(6, {}));
+assertEq(".[obje", ".".padEnd(6, {}));
+
+assertEq("1,2,3.", ".".padStart(6, [1, 2, 3]));
+assertEq(".1,2,3", ".".padEnd(6, [1, 2, 3]));
+
+assertEq("aaaaa.", ".".padStart(6, {toString: () => "a"}));
+assertEq(".aaaaa", ".".padEnd(6, {toString: () => "a"}));
+
+// undefined is converted to " "
+
+assertEq("     .", ".".padStart(6, undefined));
+assertEq(".     ", ".".padEnd(6, undefined));
+
+assertEq("     .", ".".padStart(6));
+assertEq(".     ", ".".padEnd(6));
+
+// The empty string has no effect
+
+assertEq("Tilda", "Tilda".padStart(100000, ""));
+assertEq("Tilda", "Tilda".padEnd(100000, ""));
+
+assertEq("Tilda", "Tilda".padStart(100000, {toString: () => ""}));
+assertEq("Tilda", "Tilda".padEnd(100000, {toString: () => ""}));
+
+// Test repetition against a bruteforce implementation
+
+let filler = "space";
+let truncatedFiller = "";
+for (let i = 0; i < 2500; i++) {
+    truncatedFiller += filler[i % filler.length];
+    assertEq(truncatedFiller + "goto", "goto".padStart(5 + i, filler));
+    assertEq("goto" + truncatedFiller, "goto".padEnd(5 + i, filler));
+}
+
+// [Argument] Length
+
+assertEq(1, String.prototype.padStart.length)
+assertEq(1, String.prototype.padEnd.length)
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);
+