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BDD testing framework for Elixir inspired by RSpec.
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lib/espec/assertions/change.ex
defmodule ESpec.Assertions.Change do
@moduledoc """
Defines 'change' assertion.
it do: expect(function1).to change(function2, to)
"""
use ESpec.Assertions.Interface
defp match(subject, [func]) do
initial = func.()
subject.()
then = func.()
result = initial != then
{result, result}
end
defp success_message(subject, [func], _result, positive) do
to = if positive, do: "changes", else: "doesn't change"
"`#{inspect(subject)}` #{to} the value of `#{inspect(func)}`."
end
defp error_message(subject, [func], _result, positive) do
to = if positive, do: "to", else: "not to"
but = if positive, do: "didn't change", else: "changed"
"Expected `#{inspect(subject)}` #{to} change the value of `#{inspect(func)}`, but it #{but}."
end
end