Update: Namespace

Co-authored-by: will-larkin-nhs <160748088+will-larkin-nhs@users.noreply.github.com>

Author: Joseph2910

tests/UnitTests/SharedTests/ValidationHelperTests/ValidationHelperTests.cs

@@ -1,4 +1,5 @@
-namespace ValidationHelperTests;
+namespace NHS.CohortManager.Tests.Shared;
+
 
 using Common;