#PHPUnit `expect*()` replacement.

FooTest.php

<?php

declare(strict_types=1);

namespace Foo\Tests\Unit;

final class FooTest extends TestCase
{
  public function testFoo(): void
  {
      set_error_handler(
          static function (int $errno, string $errstr ) {
              restore_error_handler();
              throw new \Exception( $errstr, $errno );
          },
          E_ALL
      );

      $this->expectException(\Exception::class);
      $this->expectExceptionMessageMatches('Expected Warning/Error/Deprecation message');
  }
}