mattiaerre · June 13, 2021 10:33 · Apr 15, 2019 · Apr 15, 2019 · Apr 15, 2019 · Apr 15, 2019
diff --git a/README.md b/README.md
@@ -8,9 +8,11 @@ app.get('/playground', handler);
 
 `http://localhost:9000/playground`
 
+```txt
 Request URL: http://localhost:9000/playground
 Request Method: GET
 Status Code: 200 OK
+```
 
 ```json
 {"message":"OK"}
@@ -20,9 +22,11 @@ Status Code: 200 OK
 
 `http://localhost:9000/playground?error=KO`
 
+```txt
 Request URL: http://localhost:9000/playground?error=KO
 Request Method: GET
 Status Code: 500 Internal Server Error
+```
 
 ```json
 {"message":"KO"}

diff --git a/README.md b/README.md
@@ -8,6 +8,22 @@ app.get('/playground', handler);
 
 `http://localhost:9000/playground`
 
+Request URL: http://localhost:9000/playground
+Request Method: GET
+Status Code: 200 OK
+
+```json
+{"message":"OK"}
+```
+
 ## 500
 
 `http://localhost:9000/playground?error=KO`
+
+Request URL: http://localhost:9000/playground?error=KO
+Request Method: GET
+Status Code: 500 Internal Server Error
+
+```json
+{"message":"KO"}
+```
diff --git a/README.md b/README.md
@@ -0,0 +1,13 @@
+# How to test it in an Express app
+
+```javascript
+app.get('/playground', handler);
+```
+
+## 200
+
+`http://localhost:9000/playground`
+
+## 500
+
+`http://localhost:9000/playground?error=KO`
diff --git a/handler.js b/handler.js
@@ -1,6 +1,6 @@
 async function handler({ query: { error } }, res) {
   if (error) {
-    return res.send({ message: error }).status(500);
+    return res.status(500).send({ message: error });
   }
   return res.status(200).send({ message: 'OK' });
 }

diff --git a/handler.test.js b/handler.test.js
@@ -18,7 +18,7 @@ describe('handler', () => {
     it(description, async () => {
       const req = { query: { error } };
       const res = {
-        send: jest.fn(() => res),
+        send: jest.fn(),
         status: jest.fn(() => res)
       };
 

diff --git a/handler.test.js.snap b/handler.test.js.snap
@@ -0,0 +1,13 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`handler w/ error 1`] = `
+Object {
+  "message": "Oh Noes!",
+}
+`;
+
+exports[`handler w/o error 1`] = `
+Object {
+  "message": "OK",
+}
+`;
diff --git a/handler.js b/handler.js
@@ -0,0 +1,8 @@
+async function handler({ query: { error } }, res) {
+  if (error) {
+    return res.send({ message: error }).status(500);
+  }
+  return res.status(200).send({ message: 'OK' });
+}
+
+module.exports = handler;
diff --git a/handler.test.js b/handler.test.js
@@ -0,0 +1,30 @@
+const handler = require('./handler');
+
+describe('handler', () => {
+  const scenarios = [
+    {
+      description: 'w/o error',
+      error: null,
+      status: 200
+    },
+    {
+      description: 'w/ error',
+      error: 'Oh Noes!',
+      status: 500
+    }
+  ];
+
+  scenarios.forEach(({ description, error, status }) => {
+    it(description, async () => {
+      const req = { query: { error } };
+      const res = {
+        send: jest.fn(() => res),
+        status: jest.fn(() => res)
+      };
+
+      await handler(req, res);
+      expect(res.status).toBeCalledWith(status);
+      expect(res.send.mock.calls[0][0]).toMatchSnapshot();
+    });
+  });
+});
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