add a test proving the new scenario

Author: baronfel

src/Resolvers/Microsoft.DotNet.SdkResolver/VSSettings.cs

@@ -63,7 +63,7 @@ private VSSettings()
         }
 
         // Test constructor
-        public VSSettings(string settingsFilePath, bool disallowPrereleaseByDefault)
+        public VSSettings(string? settingsFilePath, bool disallowPrereleaseByDefault)
         {
             _settingsFilePath = settingsFilePath;
             _disallowPrereleaseByDefault = disallowPrereleaseByDefault;