How to test laravel controller method?

php laravel testing design-patterns

PHP Snippet 1:

$language = Language::create($request->only(['name', 'code', 'flag']));

PHP Snippet 2:

$response = $this->postJson('/language', ['name' => 'Swedish', 'code' => 'swe', 'flag => 'SE']);
 
$response
    ->assertStatus(200)
    ->assertJson([
        'success' => 'Language has been created successfully',
    ])
    ->assertJsonPath('data.name', 'Swedish')
    ->assertJsonPath('data.code', 'swe')
    ->assertJsonPath('data.flag', 'SE');