Laravel testing assertJSONStructure is passing even when it should have failed

This is the sample of response I received on ajax:

data: [
	{
		action: "some string",
		id: 1,
		price: 399,
		service_name: "Get a Domain",
		title: "BASIC",
	},
	{...},
	{...}
	]
draw: 1
recordsFiltered: 21
recordsTotal: 21

and my test for this is:

class PackageTest extends TestCase
{
    use RefreshDatabase, WithFaker, DatabaseMigrations;
    protected $endPoint = '/dashboard/packages';

    /**========================
     * Should Pass Test Case *
    =========================*/
    public function test_packages_list_showing_correctly()
    {
        $this->signIn();
        $resp = $this->ajaxGet($this->endPoint)
            ->assertStatus(Response::HTTP_OK)
            ->assertJsonStructure([
                'data' => [
                    '*' => [
                        'xid',
                        'xtitle',
                        'xprice',
                        'xservice_name'
                    ]
                ],
            ]);
    }
}

Actually, this should have been failed but surprisingly it is being passed. What am I doing wrong here? or from where should I start debugging it.

But, this one is failing, because of xdata

            ->assertJsonStructure([
                'xdata' => [
                    '*' => [
                        'xid',
                        'xtitle',
                        'xprice',
                        'xservice_name'
                    ]
                ],
            ]);

By the way, if you are curious what does those signin() and ajaxGet(), then here is the code of that:

protected function signIn($user = null)
{
    $user = $user ?: User::factory()->create(['role_id' => Role::factory()->create(['name' => 'superAdmin'])]);
    $this->actingAs($user, 'web');
    return $user;
}

public function ajaxGet($uri)
{
    return $this->get($uri, ['HTTP_X-Requested-With' => 'XMLHttpRequest']);
}