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BDD testing framework for Elixir inspired by RSpec.
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lib/espec/assertions/enum/have_min_by.ex
defmodule ESpec.Assertions.Enum.HaveMinBy do
@moduledoc """
Defines 'have_min_by' assertion.
it do: expect(collection).to have_min_by(func, value)
"""
use ESpec.Assertions.Interface
defp match(enum, [func, val]) do
result = Enum.min_by(enum, func)
{result == val, result}
end
defp success_message(enum, [func, val], _result, positive) do
to = if positive, do: "is", else: "is not"
"The minimum value of `#{inspect enum}` using `#{inspect func}` #{to} `#{val}`."
end
defp error_message(enum, [func, val], result, positive) do
to = if positive, do: "to be", else: "not to be"
"Expected the minimum value of `#{inspect enum}` using `#{inspect func}` #{to} `#{val}` but the minimum is `#{result}`."
end
end