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BDD testing framework for Elixir inspired by RSpec.
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lib/espec/before.ex
defmodule ESpec.Before do
@moduledoc """
Defines 'before' macro.
If before block returns {:ok, key: value},
the {key, value} is added to an 'exapmle dict'.
The dict can be accessed in another `before`, in `let`,
and in example by `shared` (`shared[:key]`).
"""
@doc "Struct has 'spec' module name and random function name."
defstruct module: nil, function: nil
@doc """
Adds %ESpec.Before structs to the @context and
defines a function with random name which will be called when example is run.
"""
defmacro before(do: block) do
function = random_before_name
quote do
tail = @context
head = %ESpec.Before{module: __MODULE__, function: unquote(function)}
def unquote(function)(var!(shared)) do
var!(shared)
unquote(block)
end
@context [head | tail]
end
end
defp random_before_name, do: String.to_atom("before_#{ESpec.Support.random_string}")
end