fix: update openapi spec to specify optional expiry argument available to be passed in via request body.

Also updated test runner to ignore any request bodies in spec that are explicitly not required.

public/openapi/write/topics/tid/pin.yaml

@@ -11,6 +11,17 @@ put:
       required: true
       description: a valid topic id
       example: 1
+  requestBody:
+    required: false
+    content:
+      application/json:
+        schema:
+          type: object
+          properties:
+            expiry:
+              type: number
+              description: A UNIX timestamp representing the moment the topic will be unpinned.
+              example: 1585337827953
   responses:
     '200':
       description: Topic successfully pinned

test/api.js

@@ -447,7 +447,10 @@ describe('API', async () => {
 
 					let body = {};
 					let type = 'json';
-					if (context[method].hasOwnProperty('requestBody') && context[method].requestBody.content['application/json']) {
+					if (
+						context[method].hasOwnProperty('requestBody') &&
+						context[method].requestBody.required !== false &&
+						context[method].requestBody.content['application/json']) {
 						body = buildBody(context[method].requestBody.content['application/json'].schema.properties);
 					} else if (context[method].hasOwnProperty('requestBody') && context[method].requestBody.content['multipart/form-data']) {
 						type = 'form';