diff --git a/test/api/v3/unit/libs/setupNconf.test.js b/test/api/v3/unit/libs/setupNconf.test.js
index e34d87c16b..1fbb046a85 100644
--- a/test/api/v3/unit/libs/setupNconf.test.js
+++ b/test/api/v3/unit/libs/setupNconf.test.js
@@ -3,29 +3,39 @@ import setupNconf from '../../../../../website/src/libs/api-v3/setupNconf';
 import nconf from 'nconf';
 
 describe('setupNconf', () => {
-  before(() => {
-    sandbox.spy(nconf, 'argv');
-    sandbox.spy(nconf, 'env');
-    sandbox.spy(nconf, 'file');
-
-    setupNconf();
+  beforeEach(() => {
+    sandbox.stub(nconf, 'argv').returnsThis();
+    sandbox.stub(nconf, 'env').returnsThis();
+    sandbox.stub(nconf, 'file').returnsThis();
   });
 
-  after(() => {
+  afterEach(() => {
     sandbox.restore();
   });
 
   it('sets up nconf', () => {
+    setupNconf();
+
     expect(nconf.argv).to.be.calledOnce;
     expect(nconf.env).to.be.calledOnce;
     expect(nconf.file).to.be.calledOnce;
+    expect(nconf.file).to.be.calledWithMatch('user', /\/config.json$/);
   });
 
   it('sets IS_PROD variable', () => {
+    setupNconf();
     expect(nconf.get('IS_PROD')).to.exist;
   });
 
   it('sets IS_DEV variable', () => {
+    setupNconf();
     expect(nconf.get('IS_DEV')).to.exist;
   });
+
+  it('allows a custom config.json file to be passed in', () => {
+    setupNconf('customfile.json');
+
+    expect(nconf.file).to.be.calledOnce;
+    expect(nconf.file).to.be.calledWithMatch('user', 'customfile.json');
+  });
 });
diff --git a/test/helpers/globals.helper.js b/test/helpers/globals.helper.js
index b825a527dc..52f9096315 100644
--- a/test/helpers/globals.helper.js
+++ b/test/helpers/globals.helper.js
@@ -14,4 +14,4 @@ global.sandbox = sinon.sandbox.create();
 //------------------------------
 // Load nconf for unit tests
 //------------------------------
-require('../../website/src/libs/api-v3/setupNconf')();
+require('../../website/src/libs/api-v3/setupNconf')('./config.json.example');
diff --git a/website/src/libs/api-v3/setupNconf.js b/website/src/libs/api-v3/setupNconf.js
index ff0da651df..a3ba29f779 100644
--- a/website/src/libs/api-v3/setupNconf.js
+++ b/website/src/libs/api-v3/setupNconf.js
@@ -3,11 +3,13 @@ import { join, resolve } from 'path';
 
 const PATH_TO_CONFIG = join(resolve(__dirname, '../../../../config.json'));
 
-export default function setupNconf () {
+export default function setupNconf (file) {
+  file = file || PATH_TO_CONFIG;
+
   nconf
     .argv()
     .env()
-    .file('user', PATH_TO_CONFIG);
+    .file('user', file);
 
   nconf.set('IS_PROD', nconf.get('NODE_ENV') === 'production');
   nconf.set('IS_DEV', nconf.get('NODE_ENV') === 'development');