From 2dd74df56463b19f74f071c422aa0497425c8190 Mon Sep 17 00:00:00 2001
From: Marc Littlemore <marc.littlemore@bbc.co.uk>
Date: Fri, 25 Aug 2017 20:40:14 +0100
Subject: [PATCH 1/2] Fix typo in day2 notes

---
 doc/day2.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/day2.md b/doc/day2.md
index 6c24259..9679791 100644
--- a/doc/day2.md
+++ b/doc/day2.md
@@ -57,7 +57,7 @@ export default day2;
 * Using BDD intergace - also TDD style which uses suite and test
 
 ```javascript
-import day2 from '../src/day';
+import day2 from '../src/day2';
 
 describe('day 2 tests', () => {
     it('', () => {

From 38391a33d4b7969dfdb523a4ddc06c7f7705940d Mon Sep 17 00:00:00 2001
From: Marc Littlemore <marc.littlemore@bbc.co.uk>
Date: Sat, 26 Aug 2017 18:41:52 +0100
Subject: [PATCH 2/2] Day 3 code - asynchronous tests

---
 doc/day3.md       | 120 ++++++++++++++++++++++++++++++++++++++++++++++
 src/day3.js       |  10 ++++
 test/day3.test.js |  26 ++++++++++
 3 files changed, 156 insertions(+)
 create mode 100644 doc/day3.md
 create mode 100644 src/day3.js
 create mode 100644 test/day3.test.js

diff --git a/doc/day3.md b/doc/day3.md
new file mode 100644
index 0000000..66fd96a
--- /dev/null
+++ b/doc/day3.md
@@ -0,0 +1,120 @@
+# Day 3 notes - Asynchronous tests
+
+## Mocha `done`
+
+### Create new src file and test file
+
+* In your editor create a directory for source and test
+* Create src function and export it
+
+```javascript
+function day3() {
+}
+
+export default day3;
+```
+
+```javascript
+import {expect} from 'chai';
+import day3 from '../src/day3';
+
+describe('day 3 tests', () => {
+    it('', () => {
+    });
+});
+```
+
+* Run the tests
+
+```shell
+mocha --require babel-register
+```
+
+* Run only the day3 tests
+
+```shell
+mocha --require babel-register test/day3.test.js
+```
+
+## Add timeout test
+
+```javascript
+it('should return expected value from callback', () => {
+    day3((returnedData) => {
+        expect(returnedData).to.equal('hello');
+    });
+});
+```
+* Run the tests - they appear to pass
+* We've got no code yet!
+* Let's write the code
+
+```javascript
+function day3(callback) {
+    setTimeout(() => {
+        callback('hello');
+    }, 1000);
+}
+```
+
+* Run the tests - they still appear to pass
+* It thinks test is synchronous
+* Need to tell Mocha it's an asynchronous
+* Add done to callback function and call it when we've done
+
+```javascript
+it('should return expected value from callback', (done) => {
+    day3((returnedData) => {
+        expect(returnedData).to.equal('hello');
+        done();
+    });
+});
+```
+
+## Promises
+
+```javascript
+it('should return expected value from promise', () => {
+    day3()
+        .then((returnedData) => {
+            expect(returnedData).to.equal('hello');
+        });
+});
+```
+
+```javascript
+function day3(callback) {
+    if (callback) {
+        setTimeout(() => {
+            callback('hello');
+        }, 1000);
+    } else {
+        return Promise.resolve('hello');
+    }
+}
+```
+
+* Test to return a promise which does the same
+* Gotcha : Not using done - tests pass
+* Use `done` again
+
+```javascript
+it('should return expected value from promise', (done) => {
+    day3()
+        .then((returnedData) => {
+            expect(returnedData).to.equal('hello');
+            done();
+        });
+});
+```
+
+* Better way - return a promise
+
+```javascript
+it('should return expected value from promise', () => {
+    return day3()
+        .then((returnedData) => {
+            expect(returnedData).to.equal('hello');
+        });
+});
+```
diff --git a/src/day3.js b/src/day3.js
new file mode 100644
index 0000000..2988772
--- /dev/null
+++ b/src/day3.js
@@ -0,0 +1,10 @@
+function day3(callback) {
+    if (callback) {
+        setTimeout(() => callback('hello'), 1000);
+    } else {
+        return Promise.resolve('hello');
+    }
+}
+
+
+export default day3;
diff --git a/test/day3.test.js b/test/day3.test.js
new file mode 100644
index 0000000..d0e7771
--- /dev/null
+++ b/test/day3.test.js
@@ -0,0 +1,26 @@
+import {expect} from 'chai';
+import day3 from '../src/day3';
+
+describe('day 3 tests', () => {
+    it('should return expected value from callback', (done) => {
+        day3((returnedData) => {
+            expect(returnedData).to.equal('hello');
+            done();
+        });
+    });
+
+    it('should return expected value from promise with done', (done) => {
+        day3()
+            .then((returnedData) => {
+                expect(returnedData).to.equal('hello');
+                done();
+            });
+    });
+
+    it('should return expected value from promise', () => {
+        return day3()
+            .then((returnedData) => {
+                expect(returnedData).to.equal('hello');
+            });
+    });
+});