ivn-cote · September 13, 2017 12:47 · Dec 11, 2015 · Dec 11, 2015
diff --git a/getStuff-test.js → __tests__getStuff-test.js b/getStuff-test.js → __tests__getStuff-test.js
diff --git a/getStuff-async.js b/getStuff-async.js
@@ -0,0 +1,18 @@
+// async function based version
+import request from 'request';
+
+import stuffStore from './stuffStore';
+
+export default async function getStuff(id) {
+  stuffStore.startLoading(id);
+
+  try {
+    const res = await request('/stuff/'+id);
+    const data = await res.json();
+
+    stuffStore.loaded(id, data)
+  } catch (err) {
+    if (!err instanceof request.RequestError) throw err;
+    stuffStore.failedLoading(id, err);
+  }
+}
diff --git a/getStuff-sync.js b/getStuff-sync.js
@@ -0,0 +1,18 @@
+// synchronous version which would block the browser while waiting for data
+import request from 'request';
+
+import stuffStore from './stuffStore';
+
+export default function getStuff(id) {
+  stuffStore.startLoading(id);
+
+  try {
+    const res = request('/stuff/'+id);
+    const data = res.json();
+
+    stuffStore.loaded(id, data)
+  } catch (err) {
+    if (!err instanceof request.RequestError) throw err;
+    stuffStore.failedLoading(id, err);
+  }
+}
diff --git a/getStuff-test.js b/getStuff-test.js
@@ -0,0 +1,37 @@
+jest.dontMock('../getStuff');
+
+describe('getStuff', () => {
+  let getStuff;
+  let request;
+  let stuffStore;
+
+  it('loads the data', () => {
+    const id = 1;
+    const data = {a: 1};
+
+    stuffStore = require('../stuffStore');
+
+    request = require('request');
+    // mock request() to return a promise resolving to a mocked response 
+    // object, which has a method called .json(), which returns a promise 
+    // resolving to the data object.
+    request.mockImpl(() => {
+      return Promise.resolve({
+        json: () => Promise.resolve(data),
+      });
+    });
+
+    getStuff = require('../getStuff');
+
+    // kick off the request
+    getStuff(id);
+
+    // resolve all promises
+    jest.runAllTimers();
+
+    // make assertions about what should have occurred
+    expect(stuffStore.startLoading).toBeCalledWith(id);
+    expect(stuffStore.loaded).toBeCalledWith(id, data);
+    expect(stuffStore.failedLoading).not.toBeCalled();
+  });
+})
diff --git a/getStuff.js b/getStuff.js
@@ -0,0 +1,18 @@
+// promise based version
+import request from 'request';
+
+import stuffStore from './stuffStore';
+
+export default function getStuff(id) {
+  stuffStore.startLoading(id);
+
+  request('/stuff/'+id)
+    .then(res => res.json())
+    .then(data => {
+      stuffStore.loaded(id, data)
+    })
+    .catch(err => {
+      if (!err instanceof request.RequestError) return Promise.reject(err);
+      stuffStore.failedLoading(id, err);
+    });
+}
diff --git a/stuffStore.js b/stuffStore.js
@@ -0,0 +1,10 @@
+const stuffStore = {
+  startLoading(id) {
+  },
+  loaded(id, data) {
+  },
+  failedLoading(id, err) {
+  },
+}
+
+export default stuffStore;