Changed OpenApiDocument.Paths to be null by default

Author: darrelmiller

src/Microsoft.OpenApi/Models/OpenApiDocument.cs

@@ -29,7 +29,7 @@ public class OpenApiDocument : IOpenApiSerializable, IOpenApiExtensible
         /// <summary>
         /// REQUIRED. The available paths and operations for the API.
         /// </summary>
-        public OpenApiPaths Paths { get; set; } = new OpenApiPaths();
+        public OpenApiPaths Paths { get; set; }
 
         /// <summary>
         /// An element to hold various schemas for the specification.

test/Microsoft.OpenApi.Readers.Tests/V3Tests/OpenApiDocumentTests.cs

@@ -46,7 +46,8 @@ public void ParseDocumentFromInlineStringShouldSucceed()
                     {
                         Title = "Simple Document",
                         Version = "0.9.1"
-                    }
+                    },
+                    Paths = new OpenApiPaths()
                 });
 
             context.ShouldBeEquivalentTo(
@@ -83,7 +84,8 @@ public void ParseBasicDocumentWithMultipleServersShouldSucceed()
                                 Url = new Uri("https://www.example.org/api").ToString(),
                                 Description = "The https endpoint"
                             }
-                        }
+                        },
+                        Paths = new OpenApiPaths()
                     });
             }
         }
@@ -101,7 +103,8 @@ public void ParseBrokenMinimalDocumentShouldYieldExpectedDiagnostic()
                         Info = new OpenApiInfo
                         {
                             Version = "0.9"
-                        }
+                        },
+                        Paths = new OpenApiPaths()
                     });
 
                 diagnostic.ShouldBeEquivalentTo(
@@ -130,7 +133,8 @@ public void ParseMinimalDocumentShouldSucceed()
                         {
                             Title = "Simple Document",
                             Version = "0.9.1"
-                        }
+                        },
+                        Paths = new OpenApiPaths()
                     });
 
                 diagnostic.ShouldBeEquivalentTo(

test/Microsoft.OpenApi.Tests/Services/OpenApiValidatorTests.cs

@@ -35,6 +35,7 @@ public void ResponseMustHaveADescription()
                 Title = "foo",
                 Version = "1.2.2"
             };
+            openApiDocument.Paths = new OpenApiPaths();
             openApiDocument.Paths.Add(
                 "/test",
                 new OpenApiPathItem
@@ -66,23 +67,26 @@ public void ResponseMustHaveADescription()
         [Fact]
         public void ServersShouldBeReferencedByIndex()
         {
-            var openApiDocument = new OpenApiDocument();
-            openApiDocument.Info = new OpenApiInfo()
+            var openApiDocument = new OpenApiDocument
             {
-                Title = "foo",
-                Version = "1.2.2"
-            };
-            openApiDocument.Servers = new List<OpenApiServer> {
+                Info = new OpenApiInfo()
+                {
+                    Title = "foo",
+                    Version = "1.2.2"
+                },
+                Servers = new List<OpenApiServer> {
                 new OpenApiServer
                 {
                     Url = "http://example.org"
                 },
                 new OpenApiServer
                 {
 
-                }
+                },
+            },
+                Paths = new OpenApiPaths()
             };
-            
+
             var validator = new OpenApiValidator(ValidationRuleSet.GetDefaultRuleSet());
             var walker = new OpenApiWalker(validator);
             walker.Walk(openApiDocument);
@@ -111,11 +115,14 @@ public void ValidateCustomExtension()
                      }
                  }));
 
-            var openApiDocument = new OpenApiDocument();
-            openApiDocument.Info = new OpenApiInfo()
+            var openApiDocument = new OpenApiDocument
             {
-                Title = "foo",
-                Version = "1.2.2"
+                Info = new OpenApiInfo()
+                {
+                    Title = "foo",
+                    Version = "1.2.2"
+                },
+                Paths = new OpenApiPaths()
             };
 
             var fooExtension = new FooExtension()

test/Microsoft.OpenApi.Tests/Walkers/WalkerLocationTests.cs

@@ -23,7 +23,6 @@ public void LocateTopLevelObjects()
 
             locator.Locations.ShouldBeEquivalentTo(new List<string> {
                 "#/servers",
-                "#/paths",
                 "#/tags"
             });
         }
@@ -37,6 +36,7 @@ public void LocateTopLevelArrayItems()
                     new OpenApiServer(),
                     new OpenApiServer()
                 },
+                Paths = new OpenApiPaths(),
                 Tags = new List<OpenApiTag>()
                 {
                     new OpenApiTag()
@@ -61,6 +61,7 @@ public void LocateTopLevelArrayItems()
         public void LocatePathOperationContentSchema()
         {
             var doc = new OpenApiDocument();
+            doc.Paths = new OpenApiPaths();
             doc.Paths.Add("/test", new OpenApiPathItem()
             {
                 Operations = new Dictionary<OperationType, OpenApiOperation>()
@@ -124,6 +125,7 @@ public void WalkDOMWithCycles()
 
             var doc = new OpenApiDocument()
             {
+                Paths = new OpenApiPaths(),
                 Components = new OpenApiComponents()
                 {
                     Schemas = new Dictionary<string, OpenApiSchema>