Test fixes

server/.jest-config

@@ -6,5 +6,6 @@
   "setupFiles": [
     "<rootDir>/__mocks__/console.js",
     "./server/test/helper.js"
-  ]
+  ],
+  "testEnvironment": "node"
 }

server/api/user.test.js

@@ -7,8 +7,8 @@ import { flushdb, seed, sequelize } from '../test/support';
 
 const server = new TestServer(app.callback());
 
+beforeEach(flushdb);
 beforeEach(seed);
-afterEach(flushdb);
 afterAll(() => server.close());
 afterAll(() => sequelize.close());