use async overloads

Author: MaggieKimani1

test/Microsoft.OpenApi.Readers.Tests/OpenApiReaderTests/OpenApiStreamReaderTests.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
 using System;
@@ -49,7 +49,7 @@ public async Task StreamShouldNotBeDisposedIfLeaveStreamOpenSettingIsTrueAsync()
             memoryStream.Position = 0;
             var stream = memoryStream;
 
-            var result = OpenApiDocument.Load(stream, "yaml", new OpenApiReaderSettings { LeaveStreamOpen = true });
+            _ = await OpenApiDocument.LoadAsync(stream, "yaml", new OpenApiReaderSettings { LeaveStreamOpen = true });
             stream.Seek(0, SeekOrigin.Begin); // does not throw an object disposed exception
             Assert.True(stream.CanRead);
         }
@@ -65,7 +65,7 @@ public async Task StreamShouldReadWhenInitializedAsync()
             var stream = await httpClient.GetStreamAsync("20fe7a7b720a0e48e5842d002ac418b12a8201df/tests/v3.0/pass/petstore.yaml");
 
             // Read V3 as YAML
-            var result = OpenApiDocument.Load(stream, "yaml");
+            var result = await OpenApiDocument.LoadAsync(stream, "yaml");
             Assert.NotNull(result.OpenApiDocument);
         }
     }

test/Microsoft.OpenApi.Readers.Tests/V31Tests/OpenApiDocumentTests.cs

@@ -522,9 +522,9 @@ public async Task ParseExternalDocumentDereferenceToOpenApiDocumentByIdWorks()
 
             // Act
             var result = await OpenApiDocument.LoadAsync(Path.Combine(SampleFolderPath, "externalRefById.yaml"), settings);
-            var doc2 = OpenApiDocument.Load(Path.Combine(SampleFolderPath, "externalResource.yaml")).OpenApiDocument;
+            var doc2 = (await OpenApiDocument.LoadAsync(Path.Combine(SampleFolderPath, "externalResource.yaml"))).OpenApiDocument;
 
-            var requestBodySchema = result.OpenApiDocument.Paths["/resource"].Operations[OperationType.Get].Parameters.First().Schema;
+            var requestBodySchema = result.OpenApiDocument.Paths["/resource"].Operations[OperationType.Get].Parameters[0].Schema;
             result.OpenApiDocument.Workspace.RegisterComponents(doc2);
 
             // Assert
@@ -535,10 +535,10 @@ public async Task ParseExternalDocumentDereferenceToOpenApiDocumentByIdWorks()
         public async Task ParseDocumentWith31PropertiesWorks()
         {
             var path = Path.Combine(SampleFolderPath, "documentWith31Properties.yaml");
-            var doc = OpenApiDocument.Load(path).OpenApiDocument;
+            var doc = (await OpenApiDocument.LoadAsync(path)).OpenApiDocument;
             var outputStringWriter = new StringWriter();
             doc.SerializeAsV31(new OpenApiYamlWriter(outputStringWriter));
-            outputStringWriter.Flush();
+            await outputStringWriter.FlushAsync();
             var actual = outputStringWriter.GetStringBuilder().ToString();
 
             // Assert