Add tests for inline objects (#1331)

I think these tests cover all the problems with rust-server and inline objects I know about. This should show us when we've fixed the problem.

Also fixes a CI failure.

modules/openapi-generator/src/test/resources/2_0/rust-server/rust-server-test.yaml

@@ -1,7 +1,7 @@
 swagger: '2.0'
 info:
   description: "This spec is for testing rust-server-specific things"
-  version: 2.0.0
+  version: 2.3.4
   title: rust-server-test
 schemes:
   - http
@@ -12,6 +12,12 @@ paths:
       responses:
         '200':
           description: Success
+    put:
+      parameters:
+        - $ref: '#/parameters/nested_response'
+      responses:
+        '200':
+          description: Success
   /html:
     post:
       summary: Test HTML handling
@@ -28,6 +34,20 @@ paths:
           description: Success
           schema:
             type: string
+parameters:
+  nested_response:
+    name: nested_response
+    in: body
+    required: true
+    schema:
+      # Erroneously ends up as `Option<models::InlineObject>`
+      properties:
+        id:
+          type: string
+        password:
+          type: string
+      required:
+        - id
 definitions:
   additionalPropertiesObject:
     description: An additionalPropertiesObject
@@ -46,3 +66,31 @@ definitions:
         x-nullable: true
     required:
       - RequiredNullableThing
+  ObjectOfObjects:
+    description: An object of objects
+    type: object
+    properties:
+      inner:
+        type: object
+        required:
+          - required_thing
+        properties:
+          required_thing:
+            type: string
+          optional_thing:
+            type: integer
+  # Currently broken - see https://github.com/OpenAPITools/openapi-generator/issues/8
+  # ArrayOfObjects:
+  #   description: An array of objects
+  #   type: array
+  #   items:
+  #     properties:
+  #       filename:
+  #         description: A non-required property
+  #         type: string
+  #       contents:
+  #         description: A required property
+  #         type: string
+  #     required:
+  #     - contents
+  #     type: object