Possible null reference assignment.

'LanguageServerProtocolMessageTests' is coupled with '120' different types from '31' different namespaces. Rewrite or refactor the code to decrease its class coupling below '96'. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1506)

'InitializeAsync' is coupled with '42' different types from '21' different namespaces. Rewrite or refactor the code to decrease its class coupling below '41'. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1506)

The literal or constant value "function CanSendDocumentSymbolRequest ()" should be passed as the 'expected' argument in the call to 'Assert.Equal(expected, actual)' in method 'CanSendDocumentSymbolRequestAsync' on type 'LanguageServerProtocolMessageTests'. Swap the parameter values. (https://xunit.net/xunit.analyzers/rules/xUnit2000)