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BDD testing framework for Elixir inspired by RSpec.
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lib/espec/assertions/enum_string/have_at.ex
defmodule ESpec.Assertions.EnumString.HaveAt do
@moduledoc """
Defines 'have_at' assertion.
it do: expect(enum).to have_at(pos, value)
it do: expect(string).to have_at(pos, value)
"""
use ESpec.Assertions.Interface
defp match(enum, [pos, val]) when is_binary(enum) do
result = String.at(enum, pos)
{result == val, result}
end
defp match(enum, [pos, val]) do
result = Enum.at(enum, pos)
{result == val, result}
end
defp success_message(enum, [pos, val], _result, positive) do
to = if positive, do: "has", else: "doesn't have"
"`#{inspect enum}` #{to} element `#{val}` at `#{inspect pos}` position."
end
defp error_message(enum, [pos, val], result, positive) do
to = if positive, do: "to", else: "not to"
"Expected `#{inspect enum}` #{to} have `#{inspect val}` at `#{inspect pos}` position, but it has `#{result}`."
end
end