require_relative "main"
require "test/unit"
 
class TestLCP < Test::Unit::TestCase
 
  def test_simple
    assert_equal("fl", longest_common_prefix(["flower","flow","flight"]) )
  end

  def test_empty_prefix
    assert_equal("", longest_common_prefix(["dog","racecar","car"]) )
  end

  def test_empty_string
    assert_equal("", longest_common_prefix([""]) )
  end

end