Update mocks for cypress tests

client/cypress/fixtures/mocks.js

@@ -6,6 +6,21 @@ const selectedClass = {
   members: []
 };
 
+let classMemberIndex = 0;
+
+function* classMemberIdGenerator() {
+  while (classMemberIndex < 99) {
+    classMemberIndex += 1;
+    yield btoa(`ClassMemberNode:${classMemberIndex}`);
+  }
+}
+
+const classMemberIdIterator = classMemberIdGenerator();
+
+const getClassMemberId = () => {
+  return classMemberIdIterator.next().value;
+};
+
 export default {
   UUID: () => '123-456-789',
   GenericStreamFieldType: () => ({type: 'text_block', value: 'Generic Stream Field Type'}),
@@ -66,6 +81,7 @@ export default {
     lastName: 'Last Name',
     active: true,
     isTeacher: false,
-    isMe: false
+    isMe: false,
+    id: getClassMemberId()
   })
 };