defmodule DiamondTest do
  use ExUnit.Case

  test "1 Line" do
    diamond = Diamond.build(1)
    assert List.first(diamond) == "A"
  end

  test "2 Lines (first line)" do
    diamond = Diamond.build(2)
    assert List.first(diamond) == " A "
  end

  test "2 Lines  (second line)" do
    diamond = Diamond.build(2)
    [_, s | _] = diamond
    assert s == "B B"
  end

  test "3 (first line)" do
    diamond = Diamond.build(3)
    assert List.first(diamond) == "  A  "
  end

  test "3 (second line)" do
    diamond = Diamond.build(3)
    [_, s | _] = diamond
    assert s == " B B "
  end

  test "3 (third line)" do
    diamond = Diamond.build(3)
    [_, _, s | _] = diamond
    assert s == "C   C"
  end

  test "2" do
    assert Diamond.build(2) == [" A ", "B B", " A "]
  end

  test "3" do
    assert Diamond.build(3) == ["  A  ", " B B ", "C   C", " B B ", "  A  "]
  end
end