Cheat Sheet per il framework di test ExUnit in Elixir

ExUnit è il framework di test integrato per Elixir che offre macro semplici per definire casi di test, asserzioni e hook di setup.

Casi di test (Test Cases)

defmodule MyTest do
  use ExUnit.Case
  use ExUnit.Case, async: true  # for async

  test "the truth" do
    assert 1 + 1 == 2
  end
end

---

Acquisizione di I/O e log (Capture IO & Logs)

import ExUnit.CaptureIO

test "capture io" do
  result = capture_io(fn ->
    IO.puts "sup"
  end)

  assert result == "sup\n"
end

config :ex_unit, capture_logs: true

---

Asserzioni e confutazioni (Assertions & Refutations)

assert x == y
refute x == y

assert_raise ArithmeticError, fn ->
  1 + "test"
end

assert_raise ArithmeticError, "message", fn -> ... end
assert_raise ArithmeticError, ~r/message/, fn -> ... end

flunk "This should have been an error"

---

Callback di setup e corrispondenza del contesto

setup do
  {:ok, name: "John"}
end

test "it works", %{name: name} do
  assert name == "John"
end

defp my_hook(_context) do
  {:ok, name: "John", age: 54}
end

describe "a block" do
  setup [:my_hook]

  test "John's age", context do
    assert context[:name] == "John"
    assert context[:age] == 54
  end
end

---

Cheat Sheet correlati

• Elixir
• Phoenix