PHPUnit9.0 断言-assertEmpty()

assertEmpty(mixed $actual[, string $message = ''])

PHPUnit9.0 断言集合

当 ​$actual​ 非空时报告错误，错误讯息由 ​$message​ 指定。
​assertNotEmpty()​ 是与之相反的断言，接受相同的参数。
示例 1.13 assertEmpty() 的用法

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

final class EmptyTest extends TestCase
{
    public function testFailure(): void
    {
        $this->assertEmpty(['foo']);
    }
}

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

F

Time: 0 seconds, Memory: 4.75Mb

There was 1 failure:

1) EmptyTest::testFailure
Failed asserting that an array is empty.

/home/sb/EmptyTest.php:6

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