Fix Null Warnings (#874)

* Fixing null warnings

* Fix null warnings
Fix other compiler warnings

tests/PublicApiIntegrationTests/ProgramTest.cs

@@ -2,26 +2,25 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using System.Net.Http;
 
-namespace PublicApiIntegrationTests
+namespace PublicApiIntegrationTests;
+
+[TestClass]
+public class ProgramTest
 {
-    [TestClass]
-    public class ProgramTest
+    private static WebApplicationFactory<Program> _application = new();
+
+    public static HttpClient NewClient
     {
-        private static WebApplicationFactory<Program> _application;
-
-        public static HttpClient NewClient
+        get
         {
-            get
-            {
-                return _application.CreateClient();
-            }
-        }
-
-        [AssemblyInitialize]
-        public static void AssemblyInitialize(TestContext _)
-        {
-            _application = new WebApplicationFactory<Program>();
-
+            return _application.CreateClient();
         }
     }
+
+    [AssemblyInitialize]
+    public static void AssemblyInitialize(TestContext _)
+    {
+        _application = new WebApplicationFactory<Program>();
+
+    }
 }