mirror of https://github.com/tc39/test262.git
59 lines
1.8 KiB
JavaScript
59 lines
1.8 KiB
JavaScript
// Copyright 2009 the Sputnik authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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info: |
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If x is less than or equal to -0 and x is greater than or equal to -0.5,
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Math.round(x) is equal to -0
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es5id: 15.8.2.15_A7
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description: >
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`Math.round(x)` differs from `Math.floor(x + 0.5)`:
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1) for values in [-0.5; -0]
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2) for 0.5 - Number.EPSILON / 4
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3) for odd integers in [-(2 / Number.EPSILON - 1); -(1 / Number.EPSILON + 1)] or in [1 / Number.EPSILON + 1; 2 / Number.EPSILON - 1]
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---*/
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assert.sameValue(
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1 / Math.round(-0.5),
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1 / -0,
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'The result of evaluating (1 / Math.round(-0.5)) is expected to be 1 / -0'
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);
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assert.sameValue(
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1 / Math.round(-0.25),
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1 / -0,
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'The result of evaluating (1 / Math.round(-0.25)) is expected to be 1 / -0'
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);
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assert.sameValue(1 / Math.round(-0), 1 / -0, 'The result of evaluating (1 / Math.round(-0)) is expected to be 1 / -0');
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var x = 0;
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// CHECK#4
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x = 0.5 - Number.EPSILON / 4;
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assert.sameValue(1 / Math.round(x), 1 / 0, 'The result of evaluating (1 / Math.round(x)) is expected to be 1 / 0');
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// CHECK#5
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x = -(2 / Number.EPSILON - 1);
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assert.sameValue(Math.round(x), x, 'Math.round(-(2 / Number.EPSILON - 1)) returns x');
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// CHECK#6
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x = -(1.5 / Number.EPSILON - 1);
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assert.sameValue(Math.round(x), x, 'Math.round(-(1.5 / Number.EPSILON - 1)) returns x');
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// CHECK#7
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x = -(1 / Number.EPSILON + 1);
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assert.sameValue(Math.round(x), x, 'Math.round(-(1 / Number.EPSILON + 1)) returns x');
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// CHECK#8
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x = 1 / Number.EPSILON + 1;
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assert.sameValue(Math.round(x), x, 'Math.round(1 / Number.EPSILON + 1) returns x');
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// CHECK#9
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x = 1.5 / Number.EPSILON - 1;
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assert.sameValue(Math.round(x), x, 'Math.round(1.5 / Number.EPSILON - 1) returns x');
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// CHECK#10
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x = 2 / Number.EPSILON - 1;
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assert.sameValue(Math.round(x), x, 'Math.round(2 / Number.EPSILON - 1) returns x');
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