When I run the phpunit command vendor/bin/phpunit I get this error. I did not understand where I make a mistake. can anyone solve this problem? This is terminal error output

$ vendor/bin/phpunit
PHPUnit 8.5.2 by Sebastian Bergmann and contributors.

.E.                                                                 3 / 3 (100%)

Time: 301 ms, Memory: 24.00 MB

There was 1 error:

1) Tests\Unit\DatabaseTest::testDatabase
Error: Call to undefined method Tests\Unit\DatabaseTest::assertDatabaseHas()

C:\xampp\htdocs\supportcrm\tests\Unit\DatabaseTest.php:18

ERRORS!
Tests: 3, Assertions: 2, Errors: 1.
lara

and this is my test file code.

<?php

namespace Tests\Unit;

use PHPUnit\Framework\TestCase;

class DatabaseTest extends TestCase
{
    /**
     * A basic unit test example.
     *
     * @return void
     */
    public function testDatabase()
    {
        // Make call to application...

        $this->assertDatabaseHas('users', [
            'email' => 'admin@aynsoft.com',
        ]);
    }
}