find the smallest number and MOVE it to the front of the array

gistfile1.rb

# given an array of numbers find the smallest number.
# return the same array with the lowest number at the front

#RSpec
describe 'smallest_number_move_to_the_front' do
  let(:numbers) { [24,6,8,3,234,6,7,65] }
  let(:numbers2) { [24,6,8,234,6,7,65,734,-1,322,324,43213] }

  it "method is defined" do
    expect(defined? smallest_number_move_to_the_front).to eq 'method'
  end

  it "method takes a single argument" do
    expect(method(:smallest_number_move_to_the_front).arity).to eq 1
  end

  it 'returns a new array with the lowest number first' do
    expect(smallest_number_move_to_the_front(numbers)).to eq [3,24,6,8,234,6,7,65,]
  end

  it 'returns a new array with the lowest number first' do
    expect(smallest_number_move_to_the_front(numbers2)).to eq [-1,24,6,8,234,6,7,65,734,322,324,43213]
  end

end

# code

def smallest_number_move_to_the_front(array)
  copyArray = array.sort
  lowest_number = copyArray[0]
  array.each_with_index do |value, index|
    if value == lowest_number
      array.delete_at(index)
    end
  end
    return array.unshift(lowest_number)
end