Merge pull request #2464 from microsoft/chore/path-item-serialization-tests

chore: adds missing unit tests for path items serialization

Author: baywet

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

@@ -166,7 +166,7 @@ public Task ThrowIfOpenApiUrlIsNotProvidedWhenValidatingAsync()
         public Task ThrowIfURLIsNotResolvableWhenValidatingAsync()
         {
             return Assert.ThrowsAsync<InvalidOperationException>(() =>
-                OpenApiService.ValidateOpenApiDocumentAsync("https://example.org/itdoesnmatter", _logger));
+                OpenApiService.ValidateOpenApiDocumentAsync("https://example.org926F4F21-88E7-4DC5-BF88-6C529BB77844/itdoesnmatter", _logger));
         }
 
         [Fact]