mattsnyder

defmodule Phone do
  @doc """
  Remove formatting from a phone number.

  Returns "0000000000" if phone number is not valid
  (10 digits or "1" followed by 10 digits)

  ## Examples

  iex> Phone.number("123-456-7890")

mattsnyder

test "invalid when proper number of digits but letters mixed in" do
  assert Phone.number("1a2a3a4a5a6a7a8a9a0a") == "0000000000"
end

mattsnyder

describe "Bottles Song" do

  it "the first verse" do
    expected = "99 bottles of beer on the wall, " +
      "99 bottles of beer.\n" +
      "Take one down and pass it around, " +
      "98 bottles of beer on the wall.\n"
    expect(expected).to eq(Bottles.verse(99))
  end