I would also say that avoiding side-effects is not the same thing as no side effects. Side effects are not bad. Unintentional side effects are bad.
Onor.io
kujua
Author of Erlang and Elixir for Imperative Programmers
I know, it is not re-assigning. - This is why I said “workaround for immutability”. It looks like.
0
Onor.io
I am sorry. It was your use of the phrase “Look at the re-assignment of variables” which lead me to think that perhaps you were misunderstanding Elixir’s behavior.
0
kujua
Author of Erlang and Elixir for Imperative Programmers
kujua
Author of Erlang and Elixir for Imperative Programmers
kostonstyle
archan937
I would rather use GitHub - archan937/mecks_unit: A simple Elixir package to elegantly mock module functions within (asynchronous) ExUnit tests using Erlang's :meck library · GitHub … (async) mocking using the Erlang :meck library. I don’t want to compromis (by altering my initial code and making things interchangeable) because I just want to unit test my code.
1
sribe
Cochonours
archan937
Ok, cool. I’m very happy to know what you think about MecksUnit. And btw, I just pushed a new version in which defining mock modules are done far more elegantly 
defmodule Foo do
def trim(string) do
String.trim(string)
end
end
defmodule MecksUnitTest do
use ExUnit.Case, async: true
use MecksUnit.Case
defmock String do
def trim(" Paul "), do: "Engel"
def trim(" Foo ", "!"), do: "Bar"
def trim(_, "!"), do: {:passthrough, [" Surprise! !!!!", "!"]}
def trim(_, _), do: :passthrough
end
defmock List do
def wrap(:foo), do: [1, 2, 3, 4]
end
mocked_test "using mocked module functions" do
task =
Task.async(fn ->
assert "Engel" == String.trim(" Paul ")
assert "Engel" == Foo.trim(" Paul ")
assert "Bar" == String.trim(" Foo ", "!")
assert " Surprise! " == String.trim(" Paul ", "!")
assert "MecksUnit" == String.trim(" MecksUnit ")
assert "Paul Engel" == String.trim(" Paul Engel ", " ")
assert [1, 2, 3, 4] == List.wrap(:foo)
assert [] == List.wrap(nil)
assert [:bar] == List.wrap(:bar)
assert [:foo, :bar] == List.wrap([:foo, :bar])
end)
Task.await(task)
end
end
Please note that you have to use defmock and mocked_test. Nice, huh?
1