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=== Mocking and Stubbing === Elixir provides several libraries for mocking and stubbing dependencies in your tests. One popular library is `Mox`, which enables you to define mocks and stubs that can be used during testing. With `Mox`, you can easily mock external dependencies and control their behavior in your tests. This allows you to isolate your code and test specific scenarios without relying on real external services or complex setups. Here is an example of using `Mox` to mock a database connection: ```elixir defmodule MyTest do use ExUnit.Case import Mox test "database query" do db_mock = double(MyApp.Database) expect(db_mock, :query, fn _ -> [{1, "John"}, {2, "Jane"}] end) result = MyApp.query_database(db_mock) assert result == [{1, "John"}, {2, "Jane"}] end end ```
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