API Integration Tests via jest (#10899)

* tests: experiment with api tests

* api tests are getting nice

* api: api testing ready for feedback

tests/api/client.ts

@@ -0,0 +1,30 @@
+const axios = require('axios');
+
+export function getClient(options) {
+  return axios.create({
+    baseURL: 'http://localhost:3000',
+    timeout: 1000,
+    auth: {
+      username: options.username,
+      password: options.password,
+    },
+  });
+}
+
+export function getAdminClient() {
+  return getClient({
+    username: 'admin',
+    password: 'admin',
+  });
+}
+
+let client = getAdminClient();
+
+client.callAs = function(user) {
+  return getClient({
+    username: user.login,
+    password: 'password',
+  });
+};
+
+export default client;