The description for this kata contains several ambiguities/issues.

1. You state that if "the population of foxes and rabbits exceeds 1000, in which case it will return", "The population is out of control. Year X".

What do you intend this to mean? If the poplulation of foxes AND the population of rabbits both exceed 1000, you return the message? If the sum of the foxes and rabbits exceeds 1000, you return the message? If the popluation of foxes OR the population of rabbits exceeds 1000, you return the message?

2. Your description states that you expect 1 of 3 messages to be returned. Each of these messages end in "Year X". Your kata however expects each message to be termineated with a period "." .

The kata description needs to be updated.

3. It appears that you expect the three conditions to be checked only at the end of each year. If so you should explicitly state that in the description to clear up the ambiguity. Refer to the following example example.

Year = 0
foxes = 999 rabbits = 1

Year = 1
In the Spring, the rabbit population doubles and the fox population is increased by 50% resulting with: foxes = 1498; rabbits = 2
In the Summer, each fox eats a rabbit, resulting with: foxes = 1498; rabbits = 0
In the Autumn, hunters kill 20 foxes, resulting with: foxes = 1478; rabbits = 0

With this example, your kata expects the response to be "All rabbits were eaten. Year 1." However, at the end of the Spring in year 1 there were 1,498 foxes, which implies that the response should be "The population is out of control. Year 1." since the fox population exceeds 1000 and there are still 2 rabbits alive.

This reminds me very strongly of the program that served as the basis for the AQA AS level Computing programming exam in 2017 which I took. I remember it was in Python at the sixth form I went to, but I think C#, VB.NET, Delphi and Java existed as well for schools to use if they wanted.

Is this Kata inspired by that, or is that just coincidence?

No random tests.

And the fixed tests are kinda bad, the year never gets over 10. I suspect it's because the nature of the system is quite unbalanced.