Testing is a fundamental practice in programming that allows us to validate the behavior of our code and ensure that it works as expected.

In Ruby, MiniTest is a popular library for testing. It is a powerful and flexible tool that allows you to write tests clearly and concisely.

MiniTest installation: Link to heading

• To get started, install MiniTest with the command gem install minitest.

gem install minitest

• This will provide you with the necessary tools to write and run tests.

Creation of test files: Link to heading

• Create a file with the extension .rb for each class you want to test.
• Name the file following the class_name_test.rb convention.

Example: Link to heading

# filename: user_test.rb

class UserTest < MiniTest::Test
  # ... código de prueba ...
end

Write unit tests: Link to heading

• Unit tests focus on testing a module or class individually.
• Each test must verify a specific behavior of the code.

Example: Link to heading

class UserTest < MiniTest::Test
    def test_init_user
        user = User.new("john", 25)
        assert_equal "john", user.name
        assert_equal 25, user.age
    end
end

Assertions: Link to heading

• Assertions are the tools you use to verify test results.
• MiniTest provides a variety of assertions for different types of tests.

Example: Link to heading

assert_equal expected_value, obtained_value # Check for equality
assert_nil value # Checks if a value is null
assert_match regex, string # Checks if a string matches a regular expression

Testing execution: Link to heading

• You can run the tests using the bundle exec minitest command.
• MiniTest will provide you with a summary of the results of each test.

Refactoring: Link to heading

• It is important to refactor the test code to keep it organized and readable.
• MiniTest offers tools to help you refactor tests efficiently.

In short, MiniTest allows you to write clear and concise unit tests for your Ruby code. It is an indispensable tool for any developer who wants to create reliable and robust software.

Additional Tips: Link to heading

• Write tests for all the important functionalities of your code.
• Use mocks and stubs to simulate the behavior of other dependencies.
• Integrate testing into your development workflow to ensure continuous quality.

Example of mocks and stubs: Link to heading

# Simulates an "ExternalService" object
mock = Minitest::Mock.new("ExternalService")
# Defines the behavior of the "get_data" method
mock.expect(:get_data, "data")
# ... code that uses the simulated "ExternalService" ...
# Verify that the "get_data" method was called
mock.verify

Take advantage of MiniTest to write effective unit tests and improve the reliability of your Ruby applications!