Reorganizing tests - #970

Node.js 20 actions are deprecated. The following actions are running on Node.js 20 and may not work as expected: actions/checkout@v4, actions/setup-dotnet@v4. Actions will be forced to run with Node.js 24 by default starting June 16th, 2026. Node.js 20 will be removed from the runner on September 16th, 2026. Please check if updated versions of these actions are available that support Node.js 24. To opt into Node.js 24 now, set the FORCE_JAVASCRIPT_ACTIONS_TO_NODE24=true environment variable on the runner or in your workflow file. Once Node.js 24 becomes the default, you can temporarily opt out by setting ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Non-nullable property 'MemberAccessor' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'Key' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Possible null reference argument for parameter 'instance' in 'object? MiniExcelMemberAccessor.GetValue(object instance)'.

Argument of type 'List<MiniExcelColumnMapping>' cannot be used for parameter 'mappings' of type 'List<MiniExcelColumnMapping?>' in 'CellWriteInfo[] AsyncEnumerableWriteAdapter<T>.GetRowValues(T currentValue, List<MiniExcelColumnMapping?> mappings)' due to differences in the nullability of reference types.

Nullability of reference types in value of type 'List<MiniExcelColumnMapping?>' doesn't match target type 'List<MiniExcelColumnMapping>'.

Possible null reference argument for parameter 'value' in 'List<MiniExcelColumnMapping?> ColumnMappingsProvider.GetColumnMappingFromValue(object value, MiniExcelBaseConfiguration configuration)'.

Nullability of reference types in value of type 'List<MiniExcelColumnMapping?>' doesn't match target type 'List<MiniExcelColumnMapping>'.

Argument of type 'List<MiniExcelColumnMapping>' cannot be used for parameter 'mappings' of type 'List<MiniExcelColumnMapping?>' in 'CellWriteInfo[] EnumerableWriteAdapter.GetRowValues(object currentValue, List<MiniExcelColumnMapping?> mappings)' due to differences in the nullability of reference types.

Nullability of reference types in value of type 'List<MiniExcelColumnMapping?>' doesn't match target type 'List<MiniExcelColumnMapping>'.