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BDD testing framework for Elixir inspired by RSpec.
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lib/espec/assertions/list/have_hd.ex
defmodule ESpec.Assertions.List.HaveHd do
@moduledoc """
Defines 'have_hd' assertion.
it do: expect(list).to have_hd(value)
"""
use ESpec.Assertions.Interface
defp match(list, val) do
result = hd(list)
{result == val, result}
end
defp success_message(list, val, _result, positive) do
to = if positive, do: "has", else: "doesn't have"
"`#{inspect list}` #{to} `hd` == `#{inspect val}`."
end
defp error_message(list, val, result, positive) do
to = if positive, do: "to", else: "not to"
"Expected `#{inspect list}` #{to} have `hd` `#{val}` but it has `#{result}`."
end
end