chore: adds missing yaml reader for test

Signed-off-by: Vincent Biret <[email protected]>

Author: baywet

test/Microsoft.OpenApi.Hidi.Tests/Services/OpenApiFilterServiceTests.cs

@@ -5,6 +5,7 @@
 using Microsoft.OpenApi.Models;
 using Microsoft.OpenApi.Models.Interfaces;
 using Microsoft.OpenApi.Models.References;
+using Microsoft.OpenApi.Reader;
 using Microsoft.OpenApi.Services;
 using Microsoft.OpenApi.Tests.UtilityFiles;
 using Moq;
@@ -232,7 +233,9 @@ public async Task CopiesOverAllReferencedComponentsToTheSubsetDocumentCorrectly(
 
             // Act
             using var stream = File.OpenRead(filePath);
-            var doc = (await OpenApiDocument.LoadAsync(stream, "yaml")).Document;            
+            var settings = new OpenApiReaderSettings();
+            settings.AddYamlReader();
+            var doc = (await OpenApiDocument.LoadAsync(stream, "yaml", settings)).Document;            
             var predicate = OpenApiFilterService.CreatePredicate(operationIds: operationIds);
             var subsetOpenApiDocument = OpenApiFilterService.CreateFilteredDocument(doc, predicate);