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BDD testing framework for Elixir inspired by RSpec.
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lib/espec/assertions/enum/be_empty.ex
defmodule ESpec.Assertions.Enum.BeEmpty do
@moduledoc """
Defines 'be_empty' assertion.
it do: expect(collection).to be_empty
it do: expect(string).to be_empty
"""
use ESpec.Assertions.Interface
defp match(string, _data) when is_bitstring(string) do
result = String.length(string)
{result == 0, result}
end
defp match(enum, _data) do
result = Enum.count(enum)
{result == 0, result}
end
defp success_message(enum, _data, _result, positive) do
to = if positive, do: "is", else: "is not"
"`#{inspect(enum)}` #{to} empty."
end
defp error_message(enum, _data, result, positive) do
if positive do
{"Expected `#{inspect(enum)}` to be empty, but it has `#{result}` elements.", nil}
else
{"Expected `#{inspect(enum)}` not to be empty, but it is.", nil}
end
end
end