For python this error message:
"When we pass in true, we want the string "true" as output: 'true' should equal 'True'"
could be a little more clear that the expected output is specifically with a capital T or F.

For esample instead of 'true should equal True', perhaps 'True should equal True' or 'true should equal true'

Same, instructions are not specifict as to what should be returned in JS