Started by adding some system tests for the api.

seasoned_api/test/helpers/createUser.js

@@ -0,0 +1,12 @@
+const User = require('src/user/user');
+const UserSecurity = require('src/user/userSecurity');
+const SqliteDatabase = require('src/database/sqliteDatabase');
+
+function createUser(username, email, password) {
+  const database = new SqliteDatabase(':memory:');
+  const userSecurity = new UserSecurity(database);
+  const user = new User(username, email);
+  return userSecurity.createNewUser(user, password);
+}
+
+module.exports = createUser;