Assert.NotNull breaks the test build on github for some reason

Author: pappleby

YarnSpinner.LanguageServer.Tests/HoverTests.cs

@@ -79,7 +79,7 @@ public async Task Server_OnHoverCommands_GivesInfo()
 
 
             // Then
-            Assert.NotNull(hoverResult);
+            (hoverResult?.ToString() ?? string.Empty).Should().NotBeEmpty();
             hoverResult?.Contents.MarkedStrings?.ElementAt(0).Language.Should().Be("text");
             hoverResult?.Contents.MarkedStrings?.ElementAt(0).Value.Should().Be("instance_command_no_params");