Use new testing API

Co-authored-by: Brandon Drake <drake@popularpays.com>

Author: GabrielCousin

tests/helpers/person.js

@@ -1,13 +1,16 @@
-import EmberObject from '@ember/object';
+export class Person {
+  constructor({ name, ssn }) {
+    this.name = name;
+    this.ssn = ssn;
+  }
 
-export const Person = EmberObject.extend({
   isEqual(other) {
     return this.ssn == other.ssn;
-  },
-});
+  }
+}
 
 const matchingSSN = '123-45-6789';
 
-export const alice = Person.create({ name: 'Alice', ssn: matchingSSN });
-export const alice2 = Person.create({ name: 'Alice 2', ssn: matchingSSN });
-export const bob = Person.create({ name: 'Bob', ssn: '999-99-9999' });
+export const alice = new Person({ name: 'Alice', ssn: matchingSSN });
+export const alice2 = new Person({ name: 'Alice 2', ssn: matchingSSN });
+export const bob = new Person({ name: 'Bob', ssn: '999-99-9999' });