fix: cross-platform line ending normalization in CodeFix tests - #19

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Dereference of a possibly null reference.

Possible null reference argument for parameter 'source' in 'string? Enumerable.FirstOrDefault<string>(IEnumerable<string> source, Func<string, bool> predicate)'.

Possible null reference argument for parameter 'path' in 'PortableExecutableReference MetadataReference.CreateFromFile(string path, MetadataReferenceProperties properties = default(MetadataReferenceProperties), DocumentationProvider? documentation = null)'.

Possible null reference argument for parameter 'source' in 'string? Enumerable.FirstOrDefault<string>(IEnumerable<string> source, Func<string, bool> predicate)'.

Possible null reference argument for parameter 'source' in 'string? Enumerable.FirstOrDefault<string>(IEnumerable<string> source, Func<string, bool> predicate)'.

Possible null reference argument for parameter 'path' in 'PortableExecutableReference MetadataReference.CreateFromFile(string path, MetadataReferenceProperties properties = default(MetadataReferenceProperties), DocumentationProvider? documentation = null)'.

Possible null reference argument for parameter 'source' in 'string? Enumerable.FirstOrDefault<string>(IEnumerable<string> source, Func<string, bool> predicate)'.

Dereference of a possibly null reference.

Possible null reference return.