PHPUnit9.0 断言-assertEqualsWithDelta()
2022-03-24 10:20 更新
assertEqualsWithDelta(mixed $expected, mixed $actual, float $delta[, string $message = ''])
PHPUnit9.0 断言集合当 $expected
和 $actual
之间的差的绝对值大于 $delta
时报告错误,错误讯息由 $message
指定。
请阅读《What Every Computer Scientist Should Know About Floating-Point Arithmetic》来了解为什么需要有 $delta
。
assertNotEqualsWithDelta()
是与之相反的断言,接受相同的参数。
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.
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