OpenAPI-DoesntWork.json

{
  "openapi" : "3.0.1",
  "info" : {
    "title" : "Test API",
    "description" : "API",
    "contact" : {
      "name" : "Foo",
      "url" : "https://foo.com",
      "email" : "foo@foo.com"
    },
    "version" : "0.1"
  },
  "paths" : {
    "/api/TestInheritance" : {
      "get" : {
        "summary" : "Does a thing",
        "description" : "retrieves an animal.",
        "operationId" : "getAnimal",
        "responses" : {
          "200" : {
            "description" : "OK",
            "content" : {
              "application/json" : {
                "schema" : {
                  "$ref" : "#/components/schemas/Animal"
                }
              }
            }
          }
        }
      }
    }
  },
  "components" : {
    "schemas" : {
      "Animal" : {
        "required" : [ "type" ],
        "type" : "object",
        "properties" : {
          "type" : {
            "type" : "string",
            "description" : "The type of animal",
            "example" : "cat"
          }
        },
        "description" : "foo",
        "discriminator" : {
          "propertyName" : "type",
          "mapping" : {
            "cat" : "#/components/schemas/Cat",
            "dog" : "#/components/schemas/Dog"
          }
        }
      },
      "Cat" : {
        "required" : [ "type" ],
        "type" : "object",
        "description" : "Cute",
        "allOf" : [ {
          "$ref" : "#/components/schemas/Animal"
        }, {
          "type" : "object",
          "properties" : { }
        } ]
      },
      "Dog" : {
        "required" : [ "type" ],
        "type" : "object",
        "description" : "Cute",
        "allOf" : [ {
          "$ref" : "#/components/schemas/Animal"
        }, {
          "type" : "object",
          "properties" : { }
        } ]
      }
    }
  }
}