ensure id field provided for mock conversation participant

flag=none

test plan:
  - specs pass

qa risk: low

Change-Id: I6a8296bec1a4c32d84ae4c3ee7fcd566c6915ca8
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/274141
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Omar Soto-Fortuño <omar.soto@instructure.com>
QA-Review: Omar Soto-Fortuño <omar.soto@instructure.com>
Product-Review: Omar Soto-Fortuño <omar.soto@instructure.com>

jest/jest-setup.js

@@ -182,7 +182,6 @@ const ignoredWarnings = [
   /is deprecated and will be removed/,
   /Missing field __typename in/,
   /Missing field errors in/,
-  /Missing field id in/,
   /Missing field moduleItem in/,
   /Please update the following components: %s/,
   /shared_brand_configs.* not called/,

ui/features/inbox/graphql/mswHandlers.js

@@ -25,6 +25,18 @@ import {graphql} from 'msw'
 import {Group} from './Group'
 import {User} from './User'
 
+// helper function that filters out undefined values in objects before assigning
+const mswAssign = (target, ...objects) => {
+  return Object.assign(
+    target,
+    ...objects.map(object => {
+      return Object.entries(object)
+        .filter(([_k, v]) => v !== undefined)
+        .reduce((obj, [k, v]) => ((obj[k] = v), obj), {}) // eslint-disable-line no-sequences
+    })
+  )
+}
+
 export const handlers = [
   graphql.query('GetConversationsQuery', (req, res, ctx) => {
     const data = {
@@ -247,11 +259,13 @@ export const handlers = [
       ctx.data({
         updateConversationParticipants: {
           conversationParticipants: [
-            {
-              ...ConversationParticipant.mock(),
-              id: req.body.variables.conversationId,
-              read: req.body.variables.read
-            }
+            mswAssign(
+              {...ConversationParticipant.mock()},
+              {
+                id: req.body.variables.conversationId,
+                read: req.body.variables.read
+              }
+            )
           ],
           errors: null,
           __typename: 'UpdateConversationParticipantsPayload'