Move notFound api v3 test to integration folder.

test/api/v3/integration/notFound.test.js

@@ -0,0 +1,13 @@
+import { requester } from '../../../helpers/api-integration.helper';
+
+describe('notFound Middleware', () => {
+  it('returns a 404 error when the resource is not found', () => {
+    let request = requester().get('/api/v3/dummy-url');
+
+    return expect(request).to.eventually.be.rejected.and.eql({
+      code: 404,
+      error: 'NotFound',
+      message: 'Not found.',
+    });
+  });
+});