Laravel test kept failing due to wrong method

I have the following test to check my simple crud application in laravel.

I have my SalesManagersTest.php in tests/features

<?php

use AppProvidersRouteServiceProvider;
use IlluminateFoundationTestingRefreshDatabase;
use TestsTestCase;
 
class SalesManagersTest extends TestCase
{
    use RefreshDatabase;
 
    public function test_can_see_index_screen()
    {
        $response = $this->get('/salesmanagers');
 
        $response->assertStatus(200);
    }
    
    public function test_can_see_add_record_screen()
    {
        $response = $this->get('/salesmanagers/create');
 
        $response->assertStatus(200);
    }
 
    public function test_can_add_new_record()
    {
        $response = $this->POST('/salesmanagers/create', [
            '_token' => csrf_token(),
            'full_name' => 'Test User',
            'email' => '[email protected]',
            'telephone' => '0775678999',
            'current_route' => 'Negombo',
            'joined_date'=>'2022/09/12',
            'comments' => 'Test comment'
        ]);
        $response->assertStatus(200);
        $response->assertRedirectedTo('salesmanagers');
    }
}

The first two tests work well but the third test is giving me an error

but since I’m trying to insert new record the method has to be POST

this is my web.php

Route::get('/', [ SalesManagersController::class, 'index' ]);
Route::resource('salesmanagers',  SalesManagersController::class);
Route::get('salesmanagers.create', [ SalesManagersController::class, 'create' ]);
Route::post('salesmanagers.create', [ SalesManagersController::class, 'store' ]);

What could be the the issue with my test?