PHPUnit9.0 断言-assertNan()

assertNan(mixed $variable[, string $message = ''])

PHPUnit9.0 断言集合

当 ​$variable​ 不是 ​NAN ​时报告错误，错误讯息由 ​$message​ 指定。
示例 1.50 assertNan() 的用法

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

final class NanTest extends TestCase
{
    public function testFailure(): void
    {
        $this->assertNan(1);
    }
}

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

F

Time: 0 seconds, Memory: 5.00Mb

There was 1 failure:

1) NanTest::testFailure
Failed asserting that 1 is nan.

/home/sb/NanTest.php:6

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