Instructions say "Assume that x is an unsigned, 32-bit integer".
But random tests (python, btw) are giving me 50+ bit integers for x, such as 7,138,606,154,252,560.

Ruby 3.0 should be enabled, see this to learn how to do it

Please organize the structure of test fixture as following (although it has been mentioned in the attached link, I'm repeated here again)

describe "<This message should describe the categories of test groups inside this block>" do
  it "<A short message describing this test group>" do
    expect(...).to eq(...) #Assertions
    #Or Test.assert_equals(user_response, reference_response)
  end
end

Haskell, JavaScript, and Rust expect integers instead of booleans.