QUnit Close assertion plugin

This plugin for QUnit adds close, notClose, close.percent, and notClose.percent
assertion methods to test that a number is approximately equal (or not) to an expected number, within a given tolerance.

Usage

``js
assert.close(actual, expected, maxDifference, message);

assert.notClose(actual, expected, minDifference, message);

assert.close.percent(actual, expected, maxPercentDifference, message);
// Alternatively:
assert.closePercent(actual, expected, maxPercentDifference, message);

assert.notClose.percent(actual, expected, minPercentDifference, message);
// Alternatively:
assert.notClosePercent(actual, expected, minPercentDifference, message);
`

Where:
- maxDifference: the maximum inclusive difference allowed (tolerance) between the actual and expected numbers
- minDifference: the minimum exclusive difference allowed (tolerance) between the actual and expected numbers
- actual, expected, message: The usual

Examples

$3


`js
QUnit.test('Example number unit test', function(assert) {
assert.close(3.141, Math.PI, 0.001);
assert.notClose(3.1, Math.PI, 0.001);
});
`

$3

`js
QUnit.test('Example percentage unit test', function(assert) {
assert.close.percent(155, 150, 3.4); // Difference is ~3.33%
assert.notClose.percent(156, 150, 3.5); // Difference is 4.0%
});
``

For more examples, refer to the unit tests.