Now, I'm going to complete the design of 
layout-images. 
There's nothing really new in this 
function. 
You know how to design it at this point, 
but I suggest you follow along with me 
anyways. 
I think you might have heard me say once 
or twice that you can never get too much 
practice. 
Now, I want to complete the design of 
layout-images. 
So, the next thing I need to do is some 
check expects. 
Check expect layout-images. 
Let's see the empty, if you layout the 
empty images then that's just going to 
produce blank. 
And now, we'll do one for layout-images 
of let's see, you know, we can grab this 
example from up here, it's a perfectly 
good example that's too long. 
In a minute, I'll use command i to fix 
the indentation. 
Let me just do that, command i fixes the 
indentation. 
Layout-images, well, what's that going to 
be? 
We kind of figured this out before. 
Right? 
It's beside, of this rectangle, this 
rectangle and blank. 
I'll run that. 
The tests are well formed, but now a 
number of tests are failing. 
I'll go get the template, I'll paste it 
in here. 
I'll comment out the stab, ow! 
Meaning the template and the natural 
recursion. 
And now, let's see, if I'm laying out an 
empty list of integers I've produced 
blank, and otherwise, I just put the 
first image beside the result of the 
natural recursion command and fixes the 
annotation. 
I run it. 
Let's see, there's one test, I have to be 
careful. 
And now one of the four tests are 
failing. 
First thing I need to know is that, is 
that a test on layout-images. 
And it isn't. 
When I click on it, it's a test on 
arrange images. 
So, layout-images is actually working 
properly now. 
Why is this test on arrange images 
failing? 
Oh, look, this other test isn't failing. 
What's happening here is, the arrange 
images test where the list doesn't 
require sorting is working fine. 
The arranged images test where the list 
does require sorting isn't working. 
And that's because of this stab we made 
for sort images that just produces 
whatever it's given. 
If you happen to call sort images with a 
list that's already sorting, it happens 
to work. 
So, that's why one of these cases of 
arrange images is working, and one isn't. 
This is going to start to happen more and 
more. 
As you get a big program with multiple 
stabs in it, some tests might work, some 
other tests might not work. 
The key thing is, since I just finished 
layout-images, what I want to be sure is 
that those tests are passing, and they 
are. 
So, layout-images seems to be done now. 
Going back to my overview diagram of 
where we are in the overall process, 
arrange images is still done except it 
has uncompleted wish list entries. 
The layout-images wish list entry is 
completely done, layout-images is done 
and tested. 
But sort-images is still sitting there in 
stab form. 
That's what we are going to turn to in 
the next video.