Update azure-pipelines.yml for Azure Pipelines

Author: jjxtra

azure-pipelines.yml

@@ -13,7 +13,7 @@ variables:
     buildConfiguration: 'Release'
 
 steps:
-    - script: dotnet build --configuration $(buildConfiguration)
+    - script: dotnet build ExchangeSharpTests.csproj --configuration $(buildConfiguration)
       displayName: 'Build All'
-    - script: dotnet test --configuration $(buildConfiguration)
+    - script: dotnet test ExchangeSharpTests.csproj --configuration $(buildConfiguration)
       displayName: 'Test'