fix: refuse implausible accommodation booking prices

tests/Controller/Admin/AccommodationBooking/EditControllerTest.php

@@ -8,6 +8,7 @@ use App\Controller\Admin\AccommodationBooking\EditController;
 use App\Entity\Groups\AccommodationBooking;
 use App\Entity\User;
 use App\Enum\Groups\AccommodationBookingStatus;
+use App\Exception\ImplausibleBookingPriceException;
 use App\Repository\Groups\AdditionalServiceRepository;
 use App\Repository\Groups\BoardServiceRepository;
 use App\Repository\UserRepository;
@@ -46,6 +47,39 @@ class EditControllerTest extends TestCase
         self::assertSame($status, $booking->getStatus(), 'editing leaves the status where it was');
     }
 
+    public function testAnImplausiblePriceComesBackAsAFormErrorWithoutSaving(): void
+    {
+        // The office can fix this — in the house's price rows — so it belongs on the form rather
+        // than on an error page, and nothing may be flushed in the meantime.
+        $bookingService = $this->createStub(AccommodationBookingService::class);
+        $bookingService->method('refreshPriceSnapshot')
+            ->willThrowException(new ImplausibleBookingPriceException(AccommodationBooking::MAX_TOTAL_PRICE + 1, 40, 2));
+
+        $form = $this->createMock(FormInterface::class);
+        $form->method('handleRequest')->willReturn($form);
+        $form->method('isSubmitted')->willReturn(true);
+        $form->method('isValid')->willReturn(true);
+        $form->method('has')->willReturn(false);
+        $form->expects(self::once())->method('addError');
+
+        $entityManager = $this->createMock(EntityManagerInterface::class);
+        $entityManager->expects(self::never())->method('flush');
+
+        $controller = new TestableEditController(
+            $entityManager,
+            $this->createStub(LoggerInterface::class),
+            $this->createStub(BoardServiceRepository::class),
+            $this->createStub(AdditionalServiceRepository::class),
+            $this->createStub(UserRepository::class),
+            $bookingService,
+            $form,
+        );
+
+        $response = $controller->index(new AccommodationBooking(), Request::create('/admin/accommodation-booking/1/edit', 'POST'));
+
+        self::assertSame(Response::HTTP_OK, $response->getStatusCode(), 'the form is re-rendered, not redirected');
+    }
+
     /**
      * @return iterable<string, array{AccommodationBookingStatus}>
      */