【Mockery】メソッドチェーンのモック、真面目にやるか？グータラやるか？

use Illuminate\Auth\AuthManager;

class Example
{
    public function __construct(
        private AuthManager $auth,
    ) {
    }

    public function example(): void
    {
        $userName = $this->auth
            ->guard()
            ->user()
            ->getAuthIdentifierName();

        echo "ログイン中のユーザーは $userName さんです！";
    }
}

use Illuminate\Auth\AuthManager;
use Illuminate\Contracts\Auth\Authenticatable;
use Illuminate\Contracts\Auth\Guard;
use Mockery;
use PHPUnit\Framework\TestCase;

class ExampleTest extends TestCase
{
    public function test_example_正常系(): void
    {
        $auth = Mockery::mock(AuthManager::class);

        // guard() が呼ばれることを期待
        $auth
            ->shouldReceive('guard')
            ->once()
            ->andReturn($guard = Mockery::mock(Guard::class));

        //  チェーンした user() が呼ばれることを期待
        $guard
            ->shouldReceive('user')
            ->once()
            ->andReturn($user = Mockery::mock(Authenticatable::class));

        // チェーンした getAuthIdentifierName() が呼ばれることを期待
        $user
            ->shouldReceive('getAuthIdentifierName')
            ->once()
            ->andReturn('安倍晋三');

        $action = new Example($auth);

        $this->assertSame(
            "ログイン中のユーザーは 安倍晋三 さんです！",
            $action->example(),
        );
    }
}

/**
 * Attempt to get the guard from the local cache.
 *
 * @param  string|null  $name
 * @return \Illuminate\Contracts\Auth\Guard|\Illuminate\Contracts\Auth\StatefulGuard
 */
public function guard($name = null)
{
    $name = $name ?: $this->getDefaultDriver();
    return $this->guards[$name] ?? $this->guards[$name] = $this->resolve($name);
}

/**
 * Get the currently authenticated user.
 *
 * @return \Illuminate\Contracts\Auth\Authenticatable|null
 */
public function user();

/**
 * Get the name of the unique identifier for the user.
 *
 * @return string
 */
public function getAuthIdentifierName();