AngularJS: Testing a Directive’s Controller with Isolate Scope Expressions

When writing unit tests for an AngularJS directive, there’s not a breadth of information online past the ‘basics’. This fact came to me rather quickly when I tried to write a simple unit test titled: “it(‘should call the passed function’…”. I had created a directive which accepted an isolate scope expression passed from the parent controller. Side-note: a good recap on isolate scope is found here. I finally figured it out with a little ‘controllerAs’ magic.

To follow along, open this jsfiddle!

“How did this work and what was I testing?”

This is the entire directive’s controller. My function in the directive’s controller (‘doSomething’) calls the passed expression (‘passedExpression’) from the parent controller. What I was trying to do in my test was verify that when a method in the directive’s controller was called, it was actually calling the function on the parent controller.

The Directive

So, our directive accepts the passed expression and it gets assigned to the directive’s isolate scope as  “$scope.passedExpression”. My initial thought was to simply test the MyDirectiveController without actually compiling the directive, but that doesn’t give us a full test (and would be way too easy to do!).

“Show Us the Test!”

The first test verifies that our parent scope’s variable was passed to the directive properly. The next one is what caught me. I could not figure out how to call the “doSomething()” function on the element’s controller. I tried using the ‘$controller’ injection to get to it, but the instance it created was not the same as the element’s controller. Once I started debugging, I started looking at the results of the function “element.isolateScope()“. There was a property on that scope object that was returned “myDirectiveCtrl” that I immediately found out was the directive’s controller instance! After that I could call whatever I wanted on it. With jasmine, I’m spying on my parent scope’s function to make sure it is being called.

I did see that there was an “element.controller()” function, but it never worked properly for me. If it works for you, please let me know!

“Now what?”
Go write some better unit tests! Also, write as many directives as you can! I’ve found that moving code out of my templates and into directives has really helped modularize my projects. Being able to reuse a directive is such a time (and code) saver!

Once again, this example lives on jsfiddle.

A Spaces Update (Mission Control)

I had previously blogged about how I use Mission Control Spaces in my workflow. Since my role at work has changed quite a bit (more web/less iOS) my layouts have changed a bit. It has been almost a year since I started using a ‘role based space’ setup and I’m still happy with the change.

Here’s my current setup:

  • Space 1 (Primary Monitor): Empty Space for Secondary Monitor (info)
  • Space 2 (Primary Monitor): Chrome (Gmail, General Browsing), Safari (Outlook web for work, JIRA, Stash), Spotify [GENERAL PURPOSE SPACE]
  • Space 3 (Primary Monitor): Chrome (Web Development, Karma Tests), iTerm2, WebStorm, Sublime Text [WEB DEV SPACE]
  • Space 4 (Primary Monitor): Source Tree [GIT SPACE]
  • Space 5 (Primary Monitor): XCode, iOS Simulator [iOS SPACE]
  • Space 6 (Secondary): Messages, Twitter, HipChat, Slack [COMMUNICATION SPACE]

As you can see, I’ve moved my iOS development space to the end since it so rarely gets used these days (sadface.gif) but I keep my web development space closer to the bottom of the stack. In the next few weeks, space 4 and 5 will probably get merged to keep things a bit more simple.

Maple Bourbon Bacon Almond Brittle

Maple Bourbon Bacon Brittle

Maple Bourbon Bacon Brittle

This weekend I decided to try to make an item I’d seen across instagram and pinterest, Bourbon Bacon Brittle. Now, I wouldn’t say I was a brittle expert, but I’ve probably made more batches of brittle for gifts than I’ve made any other food product (besides boxed mac and cheese!). I’d never put anything besides different kinds of nuts in the brittle though, so I wanted to give it a shot.

Let’s start with what I did and then I’ll tell you what I’m going to do next time.

Maple Bourbon Bacon process

Maple Bourbon Bacon process

Stage 1: Maple Bourbon Glaze
Ingredients:

  • 1/2 Cup Whiskey/Bourbon (I used Jack Daniels because I didn’t want to use the good stuff for the first attempt)
  • 1 Cup of Brown Sugar
  • 1/2 Maple Syrup

Steps:

  • Bring whiskey to a boil and reduce heat to a simmer
  • Simmer for around 10-15 minutes to boil alcohol off
  • Add brown sugar and syrup and mix
  • Bring mixture to a boil stirring frequently
  • Reduce to a simmer and test every 5-10 minutes for consistency
  • Once it reaches a syrup like consistency, it is ready
  • Leave it on very low heat to make it easier to brush on
GLAZED BACON!

GLAZED BACON!

Stage 2: BACON!

Ingredients:

  • All the bacon. 1 pound of it should use that amount of glaze (I used thick cut, but won’t next time)

Steps:

  • Preheat oven to 400 degrees F
  • Line a cookie sheet with foil
  • Place baking rack on cookie sheet
  • Spray pan and rack with cooking spray
  • Put as much bacon on the rack as you can get
  • Brush top of bacon with glaze from stage 1
  • Bake for 13 minutes in middle/top of oven to keep from burning
  • Take the tray out and flip bacon on the rack. Brush bacon with glaze again.
  • Bake for additional 13 minutes
  • Inspect bacon for done-ness. It will crisp up some after you take it out.
  • (At this point I re-glazed and re-baked both sides for another 2 mins because the thick cut bacon wasn’t quite done. Plus, bonus, more bourbon glaze!)
  • Remove from oven and let it cool (it will cool quicker on a different rack if you have a spare

Final Stage (3): Brittle!

Brittle cooling

Brittle cooling (Definitely not puke)

Ingredients:

  • 1 cup white sugar
  • 1/2 cup corn syrup
  • 1/8 tsp salt
  • 1 cup almonds
  • 2 tbsp butter
  • 1 tsp baking soda
  • 2 tsp vanilla
  • 2-3 slices of bacon chopped up
  • Candy Thermometer

Steps:

  • Get everything measured and prepared. Once the temp hits the sweet spot, you’ll be running around like crazy otherwise.
  • Spray a cookie sheet with cooking spray (or, if you’re like me, just use a silicone mat. That thing is truly magical!)
  • Mix sugar & corn syrup in pot and cook over medium heat.
  • Constantly stir mixture until it starts boiling then don’t touch it until it reaches 310 degrees.
  • Once it reaches 310, stir in almonds and bacon and cook 2 more minutes.
  • Mix vanilla, butter, salt, and baking soda in and stir quickly. (It will get all foamy due to the soda, but that is expected)
  • Once mixed, spread quickly onto pan and let cool.
  • Once completely cooled, break into pieces and store in a cool area (if you can manage to not eat the entire batch)

For Next Time:

Like I said above, I won’t get the thick cut bacon next time. It took longer to cook and the pieces were a bit chewy in the brittle. It was still delicious but I think having it be crunchy will make it even better.

I also put the bacon in the brittle with the almonds. I believe this basically wiped out a lot of my glaze that was on the bacon. Next time, I’ll wait until the very end (after the vanilla, butter and baking soda addition) so that the bacon retains as much glaze as possible.

AngularJS Directive’s ‘Restrict’ Real World Guide

While trying to wrangle custom directives in AngularJS, I’ve found the restrict property a bit tough to understand even after reading the guide:

The restrict option is typically set to:

  • 'A' – only matches attribute name
  • 'E' – only matches element name
  • 'C' – only matches class name

These restrictions can all be combined as needed:

  • 'AEC' – matches either attribute or element or class name

Here’s a real world example of each one in use. For these examples, we’ll define our directive as:

directive('exampleDirective', function(){
    return {
        restrict: 'A',
        template: 'This is an example directive',
    }
});

Also notice that even though our directive is named ‘exampleDirective’, Angular converts it to ‘example-directive’ when compiling the html.