diff --git a/__tests__/integration.js b/__tests__/integration.js
index 7b2c4d8..b5e2f3a 100644
--- a/__tests__/integration.js
+++ b/__tests__/integration.js
@@ -14,7 +14,7 @@ const apiWrapper = new ApiWrapper({ octokit });
 
 const rpm = new RepositoryProjectsManager({ apiWrapper, ownerName: 'acme', repositoryName: 'example-repository' });
 
-let server;
+let server = null;
 
 const mock = ({ action, matcher, data }) => {
   const actions = {
diff --git a/__tests__/projects.js b/__tests__/projects.js
index 8ffea23..f2aada7 100644
--- a/__tests__/projects.js
+++ b/__tests__/projects.js
@@ -4,7 +4,7 @@ import { ApiWrapper } from '../apiwrapper';
 import { RepositoryProjectsManager } from '../projects.js'; // eslint-disable-line import/extensions
 
 describe('RepositoryProjectsManager.assing() posts requests to the API', () => {
-  let rpm;
+  let rpm = null;
 
   beforeEach(() => {
     const apiWrapper = new ApiWrapper({ octokit: null });
@@ -121,7 +121,7 @@ describe('RepositoryProjectsManager.assing() posts requests to the API', () => {
 });
 
 describe('RepositoryProjectsManager.assing() posts requests to the API', () => {
-  let rpm;
+  let rpm = null;
 
   beforeEach(() => {
     const apiWrapper = new ApiWrapper({ octokit: null });