Add a first test with apollo-server-testing

backend/src/server.spec.js

@@ -0,0 +1,43 @@
+import { createTestClient } from 'apollo-server-testing'
+import createServer from './server'
+
+/**
+ * This file is for demonstration purposes. It does not really test the
+ * `isLoggedIn` query but demonstrates how we can use `apollo-server-testing`.
+ * All we need to do is to get an instance of `ApolloServer` and maybe we want
+ * stub out `context` as shown below.
+ *
+ */
+
+let user
+let action
+describe('isLoggedIn', () => {
+  beforeEach(() => {
+    action = async () => {
+      const { server } = createServer({
+        context: () => {
+          return {
+            user,
+          }
+        },
+      })
+      const { query } = createTestClient(server)
+
+      const isLoggedIn = `{ isLoggedIn }`
+      return query({ query: isLoggedIn })
+    }
+  })
+
+  it('returns false', async () => {
+    const expected = expect.objectContaining({ data: { isLoggedIn: false } })
+    await expect(action()).resolves.toEqual(expected)
+  })
+
+  describe('when authenticated', () => {
+    it('returns true', async () => {
+      user = { id: '123' }
+      const expected = expect.objectContaining({ data: { isLoggedIn: true } })
+      await expect(action()).resolves.toEqual(expected)
+    })
+  })
+})