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Now, I'm going to complete the design of 
layout-images. 

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There's nothing really new in this 
function. 

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You know how to design it at this point, 
but I suggest you follow along with me 

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anyways. 
I think you might have heard me say once 

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or twice that you can never get too much 
practice. 

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Now, I want to complete the design of 
layout-images. 

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So, the next thing I need to do is some 
check expects. 

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Check expect layout-images. 
Let's see the empty, if you layout the 

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empty images then that's just going to 
produce blank. 

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And now, we'll do one for layout-images 
of let's see, you know, we can grab this 

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example from up here, it's a perfectly 
good example that's too long. 

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In a minute, I'll use command i to fix 
the indentation. 

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Let me just do that, command i fixes the 
indentation. 

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Layout-images, well, what's that going to 
be? 

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We kind of figured this out before. 
Right? 

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It's beside, of this rectangle, this 
rectangle and blank. 

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I'll run that. 
The tests are well formed, but now a 

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number of tests are failing. 
I'll go get the template, I'll paste it 

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in here. 
I'll comment out the stab, ow! 

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Meaning the template and the natural 
recursion. 

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00:02:03,669 --> 00:02:09,150
And now, let's see, if I'm laying out an 
empty list of integers I've produced 

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blank, and otherwise, I just put the 
first image beside the result of the 

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natural recursion command and fixes the 
annotation. 

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I run it. 
Let's see, there's one test, I have to be 

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careful. 
And now one of the four tests are 

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failing. 
First thing I need to know is that, is 

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that a test on layout-images. 
And it isn't. 

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When I click on it, it's a test on 
arrange images. 

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So, layout-images is actually working 
properly now. 

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Why is this test on arrange images 
failing? 

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Oh, look, this other test isn't failing. 
What's happening here is, the arrange 

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images test where the list doesn't 
require sorting is working fine. 

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The arranged images test where the list 
does require sorting isn't working. 

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And that's because of this stab we made 
for sort images that just produces 

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whatever it's given. 
If you happen to call sort images with a 

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list that's already sorting, it happens 
to work. 

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So, that's why one of these cases of 
arrange images is working, and one isn't. 

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This is going to start to happen more and 
more. 

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As you get a big program with multiple 
stabs in it, some tests might work, some 

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other tests might not work. 
The key thing is, since I just finished 

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layout-images, what I want to be sure is 
that those tests are passing, and they 

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are. 
So, layout-images seems to be done now. 

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Going back to my overview diagram of 
where we are in the overall process, 

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arrange images is still done except it 
has uncompleted wish list entries. 

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The layout-images wish list entry is 
completely done, layout-images is done 

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and tested. 
But sort-images is still sitting there in 

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stab form. 
That's what we are going to turn to in 

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the next video.