fix: Resolved conflicts.

Author: HavenDV

src/Microsoft.OpenApi/Models/OpenApiDocument.cs

@@ -529,11 +529,11 @@ private static string ConvertByteArrayToString(byte[] hash)
                 string relativePath = OpenApiConstants.ComponentsSegment + reference.Type.GetDisplayName() + "/" + reference.Id;
 
                 uriLocation = useExternal
-                    ? Workspace.GetDocumentId(reference.ExternalResource)?.OriginalString + relativePath
+                    ? Workspace?.GetDocumentId(reference.ExternalResource)?.OriginalString + relativePath
                     : BaseUri + relativePath;
             }
 
-            return Workspace.ResolveReference<IOpenApiReferenceable>(uriLocation);
+            return Workspace?.ResolveReference<IOpenApiReferenceable>(uriLocation);
         }
 
         /// <summary>
@@ -628,9 +628,9 @@ public static ReadResult Parse(string input,
 
     internal class FindSchemaReferences : OpenApiVisitorBase
     {
-        private Dictionary<string, OpenApiSchema> Schemas;
+        private Dictionary<string, OpenApiSchema> Schemas = new();
 
-        public static void ResolveSchemas(OpenApiComponents components, Dictionary<string, OpenApiSchema> schemas)
+        public static void ResolveSchemas(OpenApiComponents? components, Dictionary<string, OpenApiSchema> schemas)
         {
             var visitor = new FindSchemaReferences();
             visitor.Schemas = schemas;

test/Microsoft.OpenApi.Hidi.Tests/Formatters/PowerShellFormatterTests.cs

@@ -57,18 +57,21 @@ public void RemoveAnyOfAndOneOfFromSchema()
             var walker = new OpenApiWalker(powerShellFormatter);
             walker.Walk(openApiDocument);
 
-            var testSchema = openApiDocument.Components.Schemas["TestSchema"];
-            var averageAudioDegradationProperty = testSchema.Properties["averageAudioDegradation"];
-            var defaultPriceProperty = testSchema.Properties["defaultPrice"];
+            var testSchema = openApiDocument.Components?.Schemas?["TestSchema"];
+            var averageAudioDegradationProperty = testSchema?.Properties["averageAudioDegradation"];
+            var defaultPriceProperty = testSchema?.Properties["defaultPrice"];
 
             // Assert
-            Assert.Null(averageAudioDegradationProperty.AnyOf);
-            Assert.Equal("number", averageAudioDegradationProperty.Type);
-            Assert.Equal("float", averageAudioDegradationProperty.Format);
-            Assert.True(averageAudioDegradationProperty.Nullable);
-            Assert.Null(defaultPriceProperty.OneOf);
-            Assert.Equal("number", defaultPriceProperty.Type);
-            Assert.Equal("double", defaultPriceProperty.Format);
+            Assert.NotNull(openApiDocument.Components);
+            Assert.NotNull(openApiDocument.Components.Schemas);
+            Assert.NotNull(testSchema);
+            Assert.Null(averageAudioDegradationProperty?.AnyOf);
+            Assert.Equal("number", averageAudioDegradationProperty?.Type);
+            Assert.Equal("float", averageAudioDegradationProperty?.Format);
+            Assert.True(averageAudioDegradationProperty?.Nullable);
+            Assert.Null(defaultPriceProperty?.OneOf);
+            Assert.Equal("number", defaultPriceProperty?.Type);
+            Assert.Equal("double", defaultPriceProperty?.Format);
             Assert.NotNull(testSchema.AdditionalProperties);
         }
 
@@ -83,12 +86,12 @@ public void ResolveFunctionParameters()
             var walker = new OpenApiWalker(powerShellFormatter);
             walker.Walk(openApiDocument);
 
-            var idsParameter = openApiDocument.Paths["/foo"].Operations[OperationType.Get].Parameters.Where(static p => p.Name == "ids").FirstOrDefault();
+            var idsParameter = openApiDocument.Paths?["/foo"].Operations[OperationType.Get].Parameters?.Where(static p => p.Name == "ids").FirstOrDefault();
 
             // Assert
             Assert.Null(idsParameter?.Content);
             Assert.NotNull(idsParameter?.Schema);
-            Assert.Equal("array", idsParameter?.Schema.Type);
+            Assert.Equal("array", idsParameter.Schema.Type);
         }
 
         private static OpenApiDocument GetSampleOpenApiDocument()