feat: support for showExtensions on Response objects (#6535)

test/e2e-cypress/static/documents/features/response-extension.openapi.yaml

@@ -0,0 +1,19 @@
+openapi: "3.0.0"
+
+paths:
+  /:
+    get:
+      operationId: "myOperation"
+      tags: ["myTag"]
+      summary: an operation
+      responses:
+        '200':
+          description: a pet to be returned
+          content:
+            application/json:
+              schema:
+                type: object
+        '404':
+          x-error: true
+          x-error-codes: [NOT_FOUND]
+          description: Not found

test/e2e-cypress/static/documents/features/response-extension.swagger.yaml

@@ -0,0 +1,15 @@
+swagger: "2.0"
+
+paths:
+  /:
+    get:
+      operationId: "myOperation"
+      tags: ["myTag"]
+      summary: an operation
+      responses:
+        "200":
+          description: ok
+        '404':
+          x-error: true
+          x-error-codes: [NOT_FOUND]
+          description: Not found

test/e2e-cypress/tests/features/response-extension.js

@@ -0,0 +1,49 @@
+describe("Response extension feature", () => {
+  describe("in Swagger 2", () => {
+    const swagger2BaseUrl = "/?showExtensions=true&docExpansion=full&url=/documents/features/response-extension.swagger.yaml"
+
+    describe("without x- values", () => {
+      it("should omit response extensions section", () => {
+        cy.visit(swagger2BaseUrl)
+          .get("tr.response[data-code='200'] td.response-col_description div.response__extension")
+          .should("not.exist")
+      })
+    })
+
+    describe("with x- values", () => {
+      it("should list each value", () => {
+        const page = cy.visit(swagger2BaseUrl)
+
+        page.get("tr.response[data-code='404'] td.response-col_description div.response__extension:nth-child(2)")
+          .should("have.text", "x-error: true")
+
+        page.get("tr.response[data-code='404'] td.response-col_description div.response__extension:nth-child(3)")
+        .should("have.text", "x-error-codes: List [ \"NOT_FOUND\" ]")
+      })
+    })
+  })
+
+  describe("in OpenAPI 3", () => {
+    const openAPI3BaseUrl = "/?showExtensions=true&docExpansion=full&url=/documents/features/response-extension.openapi.yaml"
+
+    describe("without x- values", () => {
+      it("should omit response extensions section", () => {
+        cy.visit(openAPI3BaseUrl)
+          .get("tr.response[data-code='200'] td.response-col_description div.response__extension")
+          .should("not.exist")
+      })
+    })
+
+    describe("with x- values", () => {
+      it("should list each value", () => {
+        const page = cy.visit(openAPI3BaseUrl)
+
+        page.get("tr.response[data-code='404'] td.response-col_description div.response__extension:nth-child(2)")
+          .should("have.text", "x-error: true")
+
+        page.get("tr.response[data-code='404'] td.response-col_description div.response__extension:nth-child(3)")
+        .should("have.text", "x-error-codes: List [ \"NOT_FOUND\" ]")
+      })
+    })
+  })
+})