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double v0.5.0 Release Notes

Release Date: 2017-06-21 // almost 7 years ago

  • Behaviour Doubles

    Now a module defining a behaviour can be used as the source of a double. The callbacks will be used in the set of functions verified for proper function name and arity when stubbing.

    defmodule TestBehaviour do
  @callback process(String.t) :: :ok
end

test "example behaviour stubbing" do
  process_stub = TestBehaviour
  |> double
  |> allow(:process, fn(_arg1) -> :ok end) # This will work fine
  |> allow(:boom, fn -> :ok end) # This will throw a VerifyingDoubleError because it's not defined.
end

    Stubbing against a behaviour may be especially useful when working in a project where the behaviour implementation should be a client concern and you don't have a concrete module to stub against.