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BDD testing framework for Elixir inspired by RSpec.
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lib/espec/assertions/list/have_tl.ex
defmodule ESpec.Assertions.List.HaveTl do
@moduledoc """
Defines 'have_tl' assertion.
it do: expect(list).to have_tl(value)
"""
use ESpec.Assertions.Interface
defp match(list, val) do
result = tl(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} `tl` == `#{inspect val}`."
end
defp error_message(list, val, result, positive) do
to = if positive, do: "to", else: "not to"
m = "Expected `#{inspect list}` #{to} have `tl` `#{inspect val}` but it has `#{inspect result}`."
if positive and not is_binary(list) do
{m, %{diff_fn: fn() -> ESpec.Diff.diff(tl(list), val) end}}
else
m
end
end
end