The Diamond Kata, First and Last Line Content

We continue our adventure trying to solve the Diamond Kata while using Property-Based testing. Last time, we added our first test, Non-empty, and discovered how to use input generators.

Intro

We continue our adventure trying to solve the Diamond Kata while using Property-Based testing. Last time, we added our first test, Non-empty, and discovered how to use input generators. Now let's figure out the next test.

First and last line content

In the diamond Kata, the first and last line of every diamond always contains A. Such regularity is perfect for a property. Even the particular case with input A, where the first line is also the last one, respects that property.

e.g.

input: A

A
input: E

----A----
---B-B---
--C---C--
-D-----D-
E-------E
-D-----D-
--C---C--
---B-B---
----A----

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