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BDD testing framework for Elixir inspired by RSpec.
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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
alias ESpec.DatesTimes.Comparator
defp match(subject, [value, {granularity, delta}] = _data) do
actual_delta =
subject
|> Comparator.diff(value, granularity)
|> abs()
result =
actual_delta
|> Kernel.<=(delta)
{result, {granularity, actual_delta}}
end
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], {granularity, actual_delta} = _result, positive) do
to = if positive, do: "to", else: "not to"
but = if actual_delta == delta, do: "it is", else: "it isn't"
{
"Expected `#{inspect(subject)}` #{to} be close to `#{inspect(value)}` with delta `#{inspect(delta)}`, but #{but}. The actual delta is {:#{granularity}, #{actual_delta}}.",
nil
}
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}.",
nil
}
end
end