PHPUnit9.0 斷言-assertEqualsWithDelta()

assertEqualsWithDelta(mixed $expected, mixed $actual, float $delta[, string $message = ''])

PHPUnit9.0 斷言集合

當(dāng) ?$expected? 和 ?$actual? 之間的差的絕對(duì)值大于 ?$delta? 時(shí)報(bào)告錯(cuò)誤，錯(cuò)誤訊息由 ?$message? 指定。
請(qǐng)閱讀《What Every Computer Scientist Should Know About Floating-Point Arithmetic》來了解為什么需要有 ?$delta?。
?assertNotEqualsWithDelta()? 是與之相反的斷言，接受相同的參數(shù)。
示例 1.20 assertEqualsWithDelta() 的用法

<?php declare(strict_types=1);
use PHPUnit\Framework\TestCase;

final class EqualsWithDeltaTest extends TestCase
{
    public function testFailure()
    {
        $this->assertEqualsWithDelta(1.0, 1.5, 0.1);
    }
}

$ phpunit EqualsWithDeltaTest
PHPUnit latest.0 by Sebastian Bergmann and contributors.

F                                                                   1 / 1 (100%)

Time: 41 ms, Memory: 6.00 MB

There was 1 failure:

1) EqualsWithDeltaTest::testFailure
Failed asserting that 1.5 matches expected 1.0.

/home/sb/EqualsWithDeltaTest.php:8

FAILURES!
Tests: 1, Assertions: 1, Failures: 1.