test(server middleware): add tests for server middleware

update lint

middleware/__tests__/serverMiddleware.spec.ts

@@ -0,0 +1,68 @@
+import { Context } from '@nuxt/types/app';
+import serverMiddleware from '../serverMiddleware';
+
+const mockRedirect = jest.fn();
+
+const BASE_INPUT = ({
+  $axios: {
+    defaults: {
+      baseURL: ''
+    }
+  },
+  store: {
+    state: {
+      servers: {
+        serverList: []
+      }
+    }
+  },
+  redirect: mockRedirect
+} as unknown) as Context;
+
+const INPUT_WITH_BASEURL = ({
+  ...BASE_INPUT,
+  $axios: { defaults: { baseURL: 'test-url' } }
+} as unknown) as Context;
+
+const INPUT_WITH_SERVERLIST = ({
+  ...BASE_INPUT,
+  store: { state: { servers: { serverList: ['item-a'] } } }
+} as unknown) as Context;
+
+const INPUT_WITH_BOTH = ({
+  ...BASE_INPUT,
+  $axios: { defaults: { baseURL: 'test-url' } },
+  store: { state: { servers: { serverList: ['item-a'] } } }
+} as unknown) as Context;
+
+const EXPECTED_REDIRECT = '/addserver';
+
+afterEach(() => mockRedirect.mockReset());
+
+describe('serverMiddleware', () => {
+  it('redirect to "/addserver/ when a baseUrl is not set', (): void => {
+    serverMiddleware(BASE_INPUT);
+
+    expect(mockRedirect).toHaveBeenCalled();
+
+    expect(mockRedirect.mock.calls[0][0]).toBe(EXPECTED_REDIRECT);
+  });
+
+  it('redirects to "/addserver" when the serverlist length is 0', (): void => {
+    serverMiddleware(INPUT_WITH_BASEURL);
+
+    expect(mockRedirect.mock.calls[0][0]).toBe(EXPECTED_REDIRECT);
+  });
+
+  it('redirects to "/addserver" when the baseUrl is undefined', (): void => {
+    serverMiddleware(INPUT_WITH_SERVERLIST);
+
+    expect(mockRedirect.mock.calls[0][0]).toBe(EXPECTED_REDIRECT);
+  });
+
+  it('does not redirect when a baseUrl is set and a serverlist is defined', (): void => {
+    serverMiddleware(INPUT_WITH_BOTH);
+
+    expect(mockRedirect.mock.calls).toHaveLength(0);
+  });
+});