added some missing cancellation tokens and fixed incorrect tests

CoreUnitTests/BaseMongoRepositoryTests/AddTests/AddOneTests.cs

@@ -16,7 +16,7 @@ public class AddOneTests : TestMongoRepositoryContext
     {
         // Arrange
         Creator = new Mock<IMongoDbCreator>();
-        var token = new CancellationToken();
+        var token = new CancellationToken(true);
         var document = new TestDocument();
 
         // Act
@@ -25,4 +25,4 @@ public class AddOneTests : TestMongoRepositoryContext
         // Assert
         Creator.Verify(x => x.AddOneAsync<TestDocument, Guid>(document, token));
     }
-}
+}