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More tests for Math.round 

Seems, Math.round(x) is implemented as `Math.floor(x + 0.5)` in some JavaScript engines.
The "Note 2 for Math.round"  was fixed for ES6 (see http://es5.github.io/#x15.8.2.15 and https://people.mozilla.org/~jorendorff/es6-draft.html#sec-math.round )
This commit is contained in:
Viktor 2015-04-04 11:36:57 +05:00
parent 43acf615b5
commit b7bfcb4bd2
1 changed files with 55 additions and 11 deletions
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66
test/built-ins/Math/round/S15.8.2.15_A7.js
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@ -7,24 +7,68 @@ info: >
Math.round(x) is equal to -0
es5id: 15.8.2.15_A7
description: >
Checking if Math.round(x) is equal -0, where x is equal to 0,
equal to -0.5, or less than -0 while greater than -0.5
`Math.round(x)` differs from `Math.floor(x + 0.5)`:
1) for values in [-0.5; -0]
2) for 0.5 - Number.EPSILON / 4
3) for odd integers in [-(2 / Number.EPSILON - 1); -(1 / Number.EPSILON + 1)] or in [1 / Number.EPSILON + 1; 2 / Number.EPSILON - 1]
---*/
// CHECK#1
if (Math.round(-0) !== -0)
{
$ERROR("#1: 'Math.round(-0) !== -0'");
if (1 / Math.round(-0.5) !== 1 / -0) {
$ERROR("#1: '1 / Math.round(-0.5) !== 1 / -0'");
}
// CHECK#2
if (Math.round(-0.5) !== -0)
{
$ERROR("#2: 'Math.round(-0.5) !== -0'");
if (1 / Math.round(-0.25) !== 1 / -0) {
$ERROR("#2: '1 / Math.round(-0.25) !== 1 / -0'");
}
// CHECK#3
if (Math.round(-0.25) !== -0)
{
$ERROR("#3: 'Math.round(-0.25) !== -0'");
if (1 / Math.round(-0) !== 1 / -0) {
$ERROR("#3: '1 / Math.round(-0) !== 1 / -0'");
}
var x = 0;
// CHECK#4
x = 0.5 - Number.EPSILON / 4;
if (1 / Math.round(x) !== 1 / 0) {
$ERROR("#4: '1 / Math.round(" + x + ") !== 1 / 0'");
}
// CHECK#5
x = -(2 / Number.EPSILON - 1);
if (Math.round(x) !== x) {
$ERROR("#5: 'Math.round(" + x + ") !== " + x + "'");
}
// CHECK#6
x = -(1.5 / Number.EPSILON - 1);
if (Math.round(x) !== x) {
$ERROR("#6: 'Math.round(" + x + ") !== " + x + "'");
}
// CHECK#7
x = -(1 / Number.EPSILON + 1);
if (Math.round(x) !== x) {
$ERROR("#7: 'Math.round(" + x + ") !== " + x + "'");
}
// CHECK#8
x = 1 / Number.EPSILON + 1;
if (Math.round(x) !== x) {
$ERROR("#8: 'Math.round(" + x + ") !== " + x + "'");
}
// CHECK#9
x = 1.5 / Number.EPSILON - 1;
if (Math.round(x) !== x) {
$ERROR("#9: 'Math.round(" + x + ") !== " + x + "'");
}
// CHECK#10
x = 2 / Number.EPSILON - 1;
if (Math.round(x) !== x) {
$ERROR("#10: 'Math.round(" + x + ") !== " + x + "'");
}