Clean projects to force a rebuild for tests

Author: Oren Novotny

azure-pipelines.ix.yml

@@ -64,6 +64,13 @@ steps:
     arguments: install --tool-path . dotnet-reportgenerator-globaltool
   displayName: Install ReportGenerator tool
 
+- task: DotNetCoreCLI@2
+  inputs:
+    command: clean
+    projects: Ix.NET/Source/**/*.csproj
+    arguments: -c $(BuildConfiguration) 
+  displayName: Clean for test
+
 - task: DotNetCoreCLI@2
   inputs:
     command: test