I think cause when I was writing it, my mindset was on expected should always = output of the method.
which is why I was surprised to see Expected = the original input cause my mind was like
"But the whole point of the method is to remove the smallest number!" that's why

Current test message:
You've mutated input array

Wonder if this will be clearer?
You've mutated input array (expectation assertion is on value of input array, not output of method)

Maybe the test expectation message can be more accurate? I thought the expectation was the output of the method, which was what confused me.

ahh right thanks - i took that to mean don't mutate the order

Sorry should have been clearer - this is with the mutations to original array test

> check for mutations to original array
Log
Direct input is [147, 376, 340, 233, 281, 322, 132, 128]

You've mutated input array -  
Expected: [147, 376, 340, 233, 281, 322, 132, 128], 
instead got: [147, 376, 340, 233, 281, 322, 132]

What I don't understand is: If the direct input is [147, 376, 340, 233, 281, 322, 132, 128], I would expect the smallest number '128' to be removed - but it seems the expectation does not expect this