Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 1 | // Copyright 2016 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | // Flags: --harmony-string-padding |
| 6 | |
| 7 | (function TestMeta() { |
| 8 | assertEquals(1, String.prototype.padStart.length); |
| 9 | assertEquals("function", typeof String.prototype.padStart); |
| 10 | assertEquals(Object.getPrototypeOf(Function), |
| 11 | Object.getPrototypeOf(String.prototype.padStart)); |
| 12 | assertEquals("padStart", String.prototype.padStart.name); |
| 13 | |
| 14 | var desc = Object.getOwnPropertyDescriptor(String.prototype, "padStart"); |
| 15 | assertFalse(desc.enumerable); |
| 16 | assertTrue(desc.configurable); |
| 17 | assertTrue(desc.writable); |
| 18 | assertEquals(undefined, desc.get); |
| 19 | assertEquals(undefined, desc.set); |
| 20 | |
| 21 | assertThrows(() => new Function(`${String.prototype.padStart}`), SyntaxError); |
| 22 | })(); |
| 23 | |
| 24 | |
| 25 | (function TestRequireObjectCoercible() { |
| 26 | var padStart = String.prototype.padStart; |
| 27 | assertThrows(() => padStart.call(null, 4, "test"), TypeError); |
| 28 | assertThrows(() => padStart.call(undefined, 4, "test"), TypeError); |
| 29 | assertEquals(" 123", padStart.call({ |
| 30 | __proto__: null, |
| 31 | valueOf() { return 123; } |
| 32 | }, 6, " ")); |
| 33 | |
| 34 | var proxy = new Proxy({}, { |
| 35 | get(t, name) { |
| 36 | if (name === Symbol.toPrimitive || name === "toString") return; |
| 37 | if (name === "valueOf") return () => 6.7; |
| 38 | assertUnreachable(); |
| 39 | } |
| 40 | }); |
| 41 | assertEquals(" 6.7", padStart.call(proxy, 6, " ")); |
| 42 | |
| 43 | proxy = new Proxy({}, { |
| 44 | get(t, name) { |
| 45 | if (name === Symbol.toPrimitive || name === "valueOf") return; |
| 46 | if (name === "toString") return () => 6.7; |
| 47 | assertUnreachable(); |
| 48 | } |
| 49 | }); |
| 50 | assertEquals(" 6.7", padStart.call(proxy, 6, " ")); |
| 51 | })(); |
| 52 | |
| 53 | |
| 54 | (function TestToLength() { |
| 55 | assertThrows(() => "123".padStart(Symbol("16")), TypeError); |
| 56 | assertEquals("123", "123".padStart(-1)); |
| 57 | assertEquals("123", "123".padStart({ toString() { return -1; } })); |
| 58 | assertEquals("123", "123".padStart(-0)); |
| 59 | assertEquals("123", "123".padStart({ toString() { return -0; } })); |
| 60 | assertEquals("123", "123".padStart(+0)); |
| 61 | assertEquals("123", "123".padStart({ toString() { return +0; } })); |
| 62 | assertEquals("123", "123".padStart(NaN)); |
| 63 | assertEquals("123", "123".padStart({ toString() { return NaN; } })); |
| 64 | })(); |
| 65 | |
| 66 | |
| 67 | (function TestFillerToString() { |
| 68 | assertEquals(" .", ".".padStart(10)); |
| 69 | assertEquals(" .", ".".padStart(10, undefined)); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 70 | assertEquals("nullnulln.", ".".padStart(10, null)); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 71 | assertEquals("XXXXXXXXX.", ".".padStart(10, { toString() { return "X"; } })); |
| 72 | assertEquals( |
| 73 | "111111111.", |
| 74 | ".".padStart(10, { toString: undefined, valueOf() { return 1; } })); |
| 75 | })(); |
| 76 | |
| 77 | |
| 78 | (function TestFillerEmptyString() { |
| 79 | assertEquals(".", ".".padStart(10, "")); |
| 80 | assertEquals(".", ".".padStart(10, { toString() { return ""; } })); |
| 81 | assertEquals( |
| 82 | ".", ".".padStart(10, { toString: undefined, valueOf() { return ""; } })); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 83 | })(); |
| 84 | |
| 85 | |
| 86 | (function TestFillerRepetition() { |
| 87 | for (var i = 2000; i > 0; --i) { |
| 88 | var expected = "xoxo".repeat(i / 4).slice(0, i - 3) + "123"; |
| 89 | var actual = "123".padStart(i, "xoxo"); |
| 90 | assertEquals(expected, actual); |
| 91 | assertEquals(i > "123".length ? i : 3, actual.length); |
| 92 | } |
| 93 | })(); |
| 94 | |
| 95 | |
| 96 | (function TestTruncation() { |
| 97 | assertEquals("ba", "a".padStart(2, "bc")); |
| 98 | })(); |