Suggestions from PR

addons/api/mirage/factories/managed-groups.js

@@ -1,5 +1,6 @@
 import factory from '../generated/factories/managed-groups';
 import permissions from '../helpers/permissions';
+import { trait } from 'ember-cli-mirage';
 
 const types = ['password', 'OIDC'];
 
@@ -14,4 +15,21 @@ export default factory.extend({
       'update',
       'delete',
     ],
+
+  authorized_collection_actions: () => {
+    return {
+      accounts: ['create', 'list'],
+    };
+  },
+  /**
+   * Generates some users for the same scope and assigns them to the group
+   * as members.
+   */
+  withMembers: trait({
+    afterCreate(group, server) {
+      const scope = group.scope;
+      const members = server.createList('user', 2, { scope });
+      group.update({ members });
+    },
+  }),
 });

addons/api/mirage/generated/factories/managed-groups.js

@@ -11,7 +11,7 @@ export default Factory.extend({
   created_time: () => date.recent(),
   updated_time: () => date.recent(),
   version: () => datatype.number(),
-  type: Math.random() < 0.5 ? 'password' : 'OIDC',
+  type: 'OIDC',
   auth_method_id: () => datatype.number(),
   member_ids: () => datatype.array(),
 });

addons/api/mirage/scenarios/default.js

@@ -44,12 +44,7 @@ export default function (server) {
   server.createList('role', 1, { scope: globalScope }, 'withPrincipals');
   server.createList('role', 5, { scope: orgScope }, 'withPrincipals');
 
-  server.createList(
-    'managed-group',
-    2,
-    { scope: globalScope },
-    'withAccountsAndUsers'
-  );
+  server.createList('managed-group', 2, { scope: globalScope }, 'withMembers');
 
   // Other resources
   server.schema.scopes.where({ type: 'project' }).models.forEach((scope) => {

addons/api/mirage/serializers/managed-groups.js

@@ -2,12 +2,4 @@ import ApplicationSerializer from './application';
 
 export default ApplicationSerializer.extend({
   modelName: 'managed-groups',
-
-  _hashForModel() {
-    const json = ApplicationSerializer.prototype._hashForModel.apply(
-      this,
-      arguments
-    );
-    return json;
-  },
 });