Update support-api test helpers

We should also stub when an invalid post request is sent to the
`/support-tickets` endpoint.

lib/gds_api/support_api.rb

@@ -31,10 +31,8 @@ def create_global_export_request(request_details)
   # SupportApi.raise_support_ticket(
   #   subject: "Feedback for app",
   #   tags: ["app_name"]
-  #   body: {
-  #     "User agent": "Safari",
-  #     "Details": "Ticket details go here.",
-  #   }
+  #   user_agent: "Safari",
+  #   description: "Ticket details go here.",
   # )
   def raise_support_ticket(params)
     post_json("#{endpoint}/support-tickets", params)

lib/gds_api/test_helpers/support_api.rb

@@ -150,10 +150,16 @@ def stub_support_api_feedback_export_request(id, response_body = nil)
           .to_return(status: 200, body: response_body.to_json)
       end
 
-      def stub_support_api_raise_support_ticket(params)
+      def stub_support_api_valid_raise_support_ticket(params)
         post_stub = stub_http_request(:post, "#{SUPPORT_API_ENDPOINT}/support-tickets")
         post_stub.with(body: params)
-        post_stub.to_return(status: 201)
+        post_stub.to_return(status: 201, body: { status: "success" }.to_json)
+      end
+
+      def stub_support_api_invalid_raise_support_ticket(params)
+        post_stub = stub_http_request(:post, "#{SUPPORT_API_ENDPOINT}/support-tickets")
+        post_stub.with(body: params)
+        post_stub.to_return(status: 422, body: { status: "error" }.to_json)
       end
 
       def stub_any_support_api_call

test/support_api_test.rb

@@ -242,13 +242,28 @@
   end
 
   describe "POST /support-tickets" do
-    it "makes a POST request to the support API" do
-      params = { subject: "Feedback for app", tags: "app_name", details: "Ticket details go here." }
-      stub_post = stub_support_api_raise_support_ticket(params)
+    it "makes a valid POST request to the support API" do
+      params = {
+        subject: "Feedback for app",
+        tags: "app_name",
+        user_agent: "Safari",
+        description: "There is something wrong with this page.",
+      }
+      stub_post = stub_support_api_valid_raise_support_ticket(params)
 
       @api.raise_support_ticket(params)
 
       assert_requested(stub_post)
     end
+
+    it "makes an invalid POST request to the support API" do
+      params = { subject: "Ticket without body" }
+
+      stub_support_api_invalid_raise_support_ticket(params)
+
+      assert_raises GdsApi::HTTPUnprocessableEntity do
+        @api.raise_support_ticket(params)
+      end
+    end
   end
 end