Improve enum values for Enum Type in Swagger ReadOnly documentation (#4191)

* Adding enum values for Enum Type in Swagger ReadOnly documentation

* Adding enum values for Enum Type in Swagger ReadOnly documentation (optimisation) and also adding default/example value

* Add new display enums, defaults, and examples when not in TIO mode (another way to have enums values in swagger.json)

* Fix npm test result

* review corrections

* fix: don't render parameter description if field is empty

* use cross-version schema variable to access properties

* pass className through Markdown component usage

* add per-field classNames to Markdown for easier styling + testing

* remove parameter Example field (out-of-scope for this PR)

* get default value from schema instead of top-level parameter

* tests: add e2e cases for swagger2 and oas3

* remove `swagger-petstore-enum.json`

the purpose of this file lives on in the e2e test specs folder

* add missing proptypes validation

* use `classnames` to more effectively union class names

test/e2e/scenarios/features/parameter-enum-rendering.js

@@ -0,0 +1,58 @@
+describe("parameter enum rendering", function () {
+    describe("swagger 2.0", () => {
+      beforeEach(function (client, done) {
+        client
+          .url("localhost:3230")
+          .waitForElementVisible(".download-url-input", 10000)
+          .pause(1000)
+          .clearValue(".download-url-input")
+          .setValue(".download-url-input", "http://localhost:3230/test-specs/features/parameter-enum-rendering.swagger.yaml")
+          .click("button.download-url-button")
+          .pause(1000)
+
+        done()
+      })
+      afterEach(function (client, done) {
+        done()
+      })
+      it("reveals a string parameter's enums and defaults when viewing that parameter", function (client) {
+        client.waitForElementVisible(".opblock-tag-section", 10000)
+        .assert.containsText(".opblock-summary-path span", "/report")
+        .click(".opblock")
+        .waitForElementVisible(".opblock.is-open", 5000)
+        .pause(500)
+        .assert.containsText("div.parameter__enum", "today, yesterday, lastweek")
+        .assert.containsText("div.parameter__default", "today")
+
+        client.end()
+      })
+    })
+    describe("openapi 3.0", () => {
+      beforeEach(function (client, done) {
+          client
+            .url("localhost:3230")
+            .waitForElementVisible(".download-url-input", 10000)
+            .pause(1000)
+            .clearValue(".download-url-input")
+            .setValue(".download-url-input", "http://localhost:3230/test-specs/features/parameter-enum-rendering.openapi.yaml")
+            .click("button.download-url-button")
+            .pause(1000)
+
+          done()
+      })
+      afterEach(function (client, done) {
+          done()
+      })
+      it("reveals a string parameter's enums and defaults when viewing that parameter", function (client) {
+          client.waitForElementVisible(".opblock-tag-section", 10000)
+              .assert.containsText(".opblock-summary-path span", "/report")
+              .click(".opblock")
+              .waitForElementVisible(".opblock.is-open", 5000)
+              .pause(500)
+              .assert.containsText("div.parameter__enum", "today, yesterday, lastweek")
+              .assert.containsText("div.parameter__default", "today")
+
+          client.end()
+      })
+    })
+})

test/e2e/specs/features/parameter-enum-rendering.openapi.yaml

@@ -0,0 +1,21 @@
+openapi: 3.0.0
+info:
+  title: test
+  version: 0.0.0
+paths:
+  /report:
+    get:
+      parameters:
+        - in: query
+          name: rel_date
+          required: true
+          schema:
+            type: string
+            default: today
+            enum:
+              - today
+              - yesterday
+              - lastweek
+      responses:
+        '200':
+          description: OK

test/e2e/specs/features/parameter-enum-rendering.swagger.yaml

@@ -0,0 +1,20 @@
+swagger: '2.0'
+info:
+  title: test
+  version: 0.0.0
+paths:
+  /report:
+    get:
+      parameters:
+        - in: query
+          name: rel_date
+          required: true
+          type: string
+          default: today
+          enum:
+            - today
+            - yesterday
+            - lastweek
+      responses:
+        200:
+          description: OK