Added Test Case to UploadCourseUseCaseTest.cs to test for Invalid ATF

AdLerBackend.Application.UnitTests/World/WorldManagement/UploadWorld/UploadCourseUseCaseTest.cs

@@ -1,4 +1,5 @@
-using System.Text.Json;
+using System.ComponentModel.DataAnnotations;
+using System.Text.Json;
 using AdLerBackend.Application.Common.DTOs;
 using AdLerBackend.Application.Common.DTOs.Storage;
 using AdLerBackend.Application.Common.Interfaces;
@@ -197,4 +198,28 @@ await _worldRepository.Received(1)
         Assert.That(result.World3DUrl, Is.EqualTo("http://localhost"));
         Assert.That(result.WorldLmsUrl, Is.EqualTo("http://localhost/course/view.php?id=1337"));
     }
+
+    [Test]
+    public async Task Handle_InvalidCourseInformation_ThrowsValidationException()
+    {
+        // Arrange
+        var systemUnderTest =
+            new UploadWorldUseCase(_lmsBackupProcessor, _mediator, _fileAccess, _worldRepository,
+                _serialization, _ilms, _configuration);
+
+        var fakedValidDsl = new WorldAtfResponse()
+        {
+
+        };
+
+        _lmsBackupProcessor.GetWorldDescriptionFromBackup(Arg.Any<Stream>()).Returns(fakedValidDsl);
+
+        // Act & Assert
+        var exception = Assert.ThrowsAsync<ValidationException>(async () => await systemUnderTest.Handle(new UploadWorldCommand
+        {
+            BackupFileStream = new MemoryStream(),
+            ATFFileStream = new MemoryStream(),
+            WebServiceToken = "testToken"
+        }, CancellationToken.None));
+    }
 }