[Fusion] Return proper subscription type during introspection (#8768)

Author: tobias-tengler

src/HotChocolate/Fusion-vnext/src/Fusion.Execution/Execution/Introspection/__Schema.cs

@@ -68,9 +68,9 @@ public static void MutationType(FieldContext context)
 
     public static void SubscriptionType(FieldContext context)
     {
-        if (context.Schema.MutationType is not null)
+        if (context.Schema.SubscriptionType is not null)
         {
-            context.AddRuntimeResult(context.Schema.MutationType);
+            context.AddRuntimeResult(context.Schema.SubscriptionType);
             context.FieldResult.SetNextValue(context.RentInitializedObjectResult());
         }
     }

src/HotChocolate/Fusion-vnext/test/Fusion.AspNetCore.Tests/__snapshots__/IntrospectionTests.IntrospectionQueries_IntrospectionQuery.yaml

@@ -27,7 +27,7 @@ request:
         }
       }
     }
-
+    
     fragment FullType on __Type {
       kind
       name
@@ -61,7 +61,7 @@ request:
         ... TypeRef
       }
     }
-
+    
     fragment InputValue on __InputValue {
       name
       description
@@ -72,7 +72,7 @@ request:
       isDeprecated
       deprecationReason
     }
-
+    
     fragment TypeRef on __Type {
       kind
       name
@@ -110,7 +110,7 @@ response:
             "name": "Mutation"
           },
           "subscriptionType": {
-            "name": "Mutation"
+            "name": "Subscription"
           },
           "types": [
             {
@@ -1707,27 +1707,27 @@ sourceSchemas:
         mutation: Mutation
         subscription: Subscription
       }
-
+      
       interface Node @test(arg: "value") {
         id: ID!
       }
-
+      
       "Interface description"
       interface Votable implements Node {
         "Interface field description"
         id: ID!
       }
-
+      
       type Mutation @test(arg: "value") {
         postReview(input: PostReviewInput): Review @test(arg: "value")
       }
-
+      
       type Post implements Votable & Node @key(fields: "id") {
         id: ID!
         postKind: PostKind @shareable
         location: String @inaccessible
       }
-
+      
       "Object type description"
       type Query @test(arg: "value") {
         "Object field description"
@@ -1737,43 +1737,43 @@ sourceSchemas:
         postById(postId: ID! @is(field: "id")): Post @lookup
         node(id: ID!): Node @lookup
       }
-
+      
       type Review implements Votable & Node @test(arg: "value") {
         id: ID!
       }
-
+      
       type Subscription @test(arg: "value") {
         onNewReview: Review
       }
-
+      
       "Union description"
       union UserCreation @test(arg: "value") = Post | Review
-
+      
       input PostReviewInput @oneOf {
         scalar: String @deprecated(reason: "No longer supported")
         pros: [PostReviewPro]
       }
-
+      
       input PostReviewPro {
         scalar: Int!
       }
-
+      
       "Input object type description"
       input PostsFilter @test(arg: "value") {
         "Input field description"
         scalar: String = "test" @test(arg: "value")
       }
-
+      
       "Enum description"
       enum PostKind @test(arg: "value") {
         "Enum value description"
         STORY @test(arg: "value")
         PHOTO @deprecated(reason: "No longer supported")
       }
-
+      
       "The `@oneOf` directive is used within the type system definition language to indicate that an Input Object is a OneOf Input Object."
       directive @oneOf on INPUT_OBJECT
-
+      
       "Directive description"
       directive @test("Directive argument description" arg: String! = "default") repeatable on QUERY | MUTATION | SUBSCRIPTION | FIELD | FRAGMENT_DEFINITION | FRAGMENT_SPREAD | INLINE_FRAGMENT | VARIABLE_DEFINITION | SCHEMA | SCALAR | OBJECT | FIELD_DEFINITION | ARGUMENT_DEFINITION | INTERFACE | UNION | ENUM | ENUM_VALUE | INPUT_OBJECT | INPUT_FIELD_DEFINITION
 operationPlan: