ff956f4dee
Return the empty string from StringPad if the filler argument is the empty string, effectively returning the string unchanged in StringPadStart and StringPadEnd. ``` "foo".padStart(100000, "") -> "foo" ``` BUG=v8:4957, v8:4954 LOG=N R=littledan@chromium.org Review-Url: https://codereview.chromium.org/1926773003 Cr-Commit-Position: refs/heads/master@{#35837}
99 lines
3.1 KiB
JavaScript
99 lines
3.1 KiB
JavaScript
// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --harmony-string-padding
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(function TestMeta() {
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assertEquals(1, String.prototype.padEnd.length);
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assertEquals("function", typeof String.prototype.padEnd);
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assertEquals(Object.getPrototypeOf(Function),
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Object.getPrototypeOf(String.prototype.padEnd));
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assertEquals("padEnd", String.prototype.padEnd.name);
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var desc = Object.getOwnPropertyDescriptor(String.prototype, "padEnd");
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assertFalse(desc.enumerable);
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assertTrue(desc.configurable);
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assertTrue(desc.writable);
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assertEquals(undefined, desc.get);
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assertEquals(undefined, desc.set);
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assertThrows(() => new Function(`${String.prototype.padEnd}`), SyntaxError);
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})();
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(function TestRequireObjectCoercible() {
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var padEnd = String.prototype.padEnd;
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assertThrows(() => padEnd.call(null, 4, "test"), TypeError);
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assertThrows(() => padEnd.call(undefined, 4, "test"), TypeError);
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assertEquals("123 ", padEnd.call({
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__proto__: null,
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valueOf() { return 123; }
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}, 6, " "));
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var proxy = new Proxy({}, {
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get(t, name) {
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if (name === Symbol.toPrimitive || name === "toString") return;
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if (name === "valueOf") return () => 6.7;
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assertUnreachable();
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}
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});
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assertEquals("6.7 ", padEnd.call(proxy, 6, " "));
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proxy = new Proxy({}, {
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get(t, name) {
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if (name === Symbol.toPrimitive || name === "valueOf") return;
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if (name === "toString") return () => 6.7;
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assertUnreachable();
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}
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});
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assertEquals("6.7 ", padEnd.call(proxy, 6, " "));
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})();
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(function TestToLength() {
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assertThrows(() => "123".padEnd(Symbol("16")), TypeError);
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assertEquals("123", "123".padEnd(-1));
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assertEquals("123", "123".padEnd({ toString() { return -1; } }));
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assertEquals("123", "123".padEnd(-0));
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assertEquals("123", "123".padEnd({ toString() { return -0; } }));
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assertEquals("123", "123".padEnd(+0));
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assertEquals("123", "123".padEnd({ toString() { return +0; } }));
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assertEquals("123", "123".padEnd(NaN));
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assertEquals("123", "123".padEnd({ toString() { return NaN; } }));
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})();
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(function TestFillerToString() {
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assertEquals(". ", ".".padEnd(10));
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assertEquals(". ", ".".padEnd(10, undefined));
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assertEquals(".nullnulln", ".".padEnd(10, null));
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assertEquals(".XXXXXXXXX", ".".padEnd(10, { toString() { return "X"; } }));
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assertEquals(
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".111111111",
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".".padEnd(10, { toString: undefined, valueOf() { return 1; } }));
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})();
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(function TestFillerEmptyString() {
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assertEquals(".", ".".padEnd(10, ""));
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assertEquals(".", ".".padEnd(10, { toString() { return ""; } }));
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assertEquals(
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".", ".".padEnd(10, { toString: undefined, valueOf() { return ""; } }));
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})();
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(function TestFillerRepetition() {
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for (var i = 2000; i > 0; --i) {
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var expected = "123" + "xoxo".repeat(i / 4).slice(0, i - 3);
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var actual = "123".padEnd(i, "xoxo");
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assertEquals(expected, actual);
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assertEquals(i > "123".length ? i : 3, actual.length);
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}
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})();
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(function TestTruncation() {
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assertEquals("ab", "a".padEnd(2, "bc"));
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})();
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