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23
24description(
25    'This test checks a few Number.toPrecision cases, including ' +
26    '<a href="http://bugs.webkit.org/show_bug.cgi?id=15145">15145: (0.999).toPrecision(1) returns incorrect result</a>' +
27    '.');
28
29shouldBeEqualToString("(0.999).toPrecision(1)", "1");
30shouldBeEqualToString("(0.999).toPrecision(2)", "1.0");
31shouldBeEqualToString("(0.999).toPrecision(3)", "0.999");
32
33var posInf = 1/0;
34var negInf = -1/0;
35var nan = 0/0;
36
37shouldBeEqualToString("(0.0).toPrecision(4)", "0.000");
38shouldBeEqualToString("(-0.0).toPrecision(4)", "0.000");
39shouldBeEqualToString("(0.0).toPrecision()", "0");
40shouldBeEqualToString("(-0.0).toPrecision()", "0");
41shouldBeEqualToString("(1234.567).toPrecision()", "1234.567");
42shouldThrow("(1234.567).toPrecision(0)");
43shouldThrow("(1234.567).toPrecision(null)"); // just like 0
44shouldThrow("(1234.567).toPrecision(false)"); // just like 0
45shouldThrow("(1234.567).toPrecision('foo')"); // just like 0
46shouldThrow("(1234.567).toPrecision(-1)");
47shouldBeEqualToString("(1234.567).toPrecision(1)", "1e+3");
48shouldBeEqualToString("(1234.567).toPrecision(true)", "1e+3"); // just like 1
49shouldBeEqualToString("(1234.567).toPrecision('1')", "1e+3"); // just like 1
50shouldBeEqualToString("(1234.567).toPrecision(2)", "1.2e+3");
51shouldBeEqualToString("(1234.567).toPrecision(2.9)", "1.2e+3");
52shouldBeEqualToString("(1234.567).toPrecision(5)", "1234.6");
53shouldBeEqualToString("(1234.567).toPrecision(21)", "1234.56700000000000728");
54// SpiderMonkey allows precision values 1 to 100, we implement the spec and only allow 1 to 21.
55shouldThrow("(1234.567).toPrecision(22)");
56shouldThrow("(1234.567).toPrecision(100)");
57shouldThrow("(1234.567).toPrecision(101)");
58
59shouldThrow("(1234.567).toPrecision(posInf)");
60shouldThrow("(1234.567).toPrecision(negInf)");
61shouldThrow("(1234.567).toPrecision(nan)"); // nan is treated like 0
62
63shouldBeEqualToString("posInf.toPrecision()", "Infinity");
64shouldBeEqualToString("negInf.toPrecision()", "-Infinity");
65shouldBeEqualToString("nan.toPrecision()", "NaN");
66