xdebug/blog/vendor/hamcrest/hamcrest-php/tests/Hamcrest/Number/IsCloseToTest.php

<?php
namespace Hamcrest\Number;

class IsCloseToTest extends \Hamcrest\AbstractMatcherTest
{

    protected function createMatcher()
    {
        $irrelevant = 0.1;

        return \Hamcrest\Number\IsCloseTo::closeTo($irrelevant, $irrelevant);
    }

    public function testEvaluatesToTrueIfArgumentIsEqualToADoubleValueWithinSomeError()
    {
        $p = closeTo(1.0, 0.5);

        $this->assertTrue($p->matches(1.0));
        $this->assertTrue($p->matches(0.5));
        $this->assertTrue($p->matches(1.5));

        $this->assertDoesNotMatch($p, 2.0, 'too large');
        $this->assertMismatchDescription('<2F> differed by <0.5F>', $p, 2.0);
        $this->assertDoesNotMatch($p, 0.0, 'number too small');
        $this->assertMismatchDescription('<0F> differed by <0.5F>', $p, 0.0);
    }
}