Provides core mocking functionality for Elixir tests.

This module offers tools to create and manage mocks within the context of individual test processes. Mocks created here are isolated and will not affect other processes, making them safe for concurrent and asynchronous testing.

Using Mockery in your tests

By adding use Mockery in your test modules, you automatically import several useful modules and functions:

• Core Mockery function mock/3
• Assertion helpers from Mockery.Assertions (assert_called!/3, refute_called!/3)
• History control functions from Mockery.History (enable_history/0, disable_history/0)

Example usage:

defmodule MyApp.User do
  def greet, do: "Hello, User!"
end

defmodule MyApp.Greeter do
  use Mockery.Macro

  def greet_user do
    mockable(MyApp.User).greet()
  end
end

defmodule MyApp.GreeterTest do
  use ExUnit.Case, async: true
  use Mockery

  test "mock greet/0 from MyApp.User" do
    mock(MyApp.User, [greet: 0], "Hello, Mocked User!")

    assert MyApp.Greeter.greet_user() == "Hello, Mocked User!"
    assert_called! MyApp.User, :greet, args: [], times: 1
  end
end