StackImpTest

stack_imp_test.exs

defmodule StackImpTest do
  use ExUnit.Case
  
  test "pops first item" do
    assert {1, [2, 3]} = StackImp.pop([1,2,3])
  end

  test "pops empty list" do
    assert {nil, []} = StackImp.pop([])
  end

  test "push to empty list" do
    assert {[3], [3]} = StackImp.push([], 3)
  end

  test "push to list begining" do
    assert {[0, 1, 2], [0, 1, 2]} = StackImp.push([1, 2], 0)
  end
end