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espec lib espec assertions be_close_to.ex
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lib/espec/assertions/be_close_to.ex

defmodule ESpec.Assertions.BeCloseTo do
@moduledoc """
Defines 'be_close_to' assertion.
it do: expect(2).to be_close_to(1, 3)
"""
use ESpec.Assertions.Interface
defp match(subject, data) do
[value, delta] = data
result = abs(subject - value) <= delta
{result, result}
end
defp success_message(subject, [value, delta], _result, positive) do
to = if positive, do: "is", else: "is not"
"`#{inspect subject}` #{to} close to `#{inspect value}` with delta `#{inspect delta}`."
end
defp error_message(subject, [value, delta], result, positive) do
to = if positive, do: "to", else: "not to"
but = if result, do: "it is", else: "it isn't"
"Expected `#{inspect subject}` #{to} be close to `#{inspect value}` with delta `#{inspect delta}`, but #{but}."
end
end