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Wouldn't it make more sense to return the hash with the denominations sorted in an order (asc or desc)

or is (nickels, pennies, dimes, quarters) a conventional way to do it?

This is a duplicate of https://www.codewars.com/kata/5365bb5d5d0266cd010009be

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