валидация статуса

backend/tests/Tnsu.ApprovalRoute.IntegrationTests/ApplicationServices/TemplateRouteStepServiceTests.cs

@@ -226,6 +226,27 @@ public sealed class TemplateRouteStepServiceTests : IClassFixture<PostgresDataba
         patched.IsFailed.ShouldBeTrue();
     }
 
+    [Fact(DisplayName = "Патч со статусом None возвращает неуспешный результат")]
+    public async Task PatchAsync_StatusNone_ReturnsFailedResult()
+    {
+        // Arrange
+        var routeId = await CreateRouteAsync("Route to patch step status none", byProject: false);
+        var created = await _service.CreateAsync(
+            routeId,
+            new CreateTemplateRouteStepRequest(1, "a@b.kz", null, null, null, RouteStepStatus.Approval, false),
+            CancellationToken.None);
+
+        // Action
+        var patched = await _service.PatchAsync(
+            routeId,
+            created.Value.Id,
+            new PatchTemplateRouteStepRequest(OrderNo: null, ExecutorEmail: null, Position: null, ProjectRole: null, HeadType: null, Status: RouteStepStatus.None, AllowReassignToOtherApprovers: null),
+            CancellationToken.None);
+
+        // Assert
+        patched.IsFailed.ShouldBeTrue();
+    }
+
     [Fact(DisplayName = "Явные ProjectRole.None и HeadType.None при патче считаются незаполненными, как и null")]
     public async Task PatchAsync_ExplicitNoneValues_TreatedAsUnfilled()
     {