What are some examples of TDD in Rails?

What are some examples of TDD in Rails?

Test-Driven Development (TDD) in Rails involves writing tests before the actual code. For example, you might start by writing a test for a model method that calculates a discount.

Can you give me a specific code example?

Sure! Here's a simple example:

# test/models/product_test.rb
require 'test_helper'

class ProductTest < ActiveSupport::TestCase
  test 'calculates discount' do
    product = Product.new(price: 100)
    assert_equal 90, product.discount(10)
  end
end

# app/models/product.rb
class Product < ApplicationRecord
  def discount(percent)
    price - (price * percent / 100)
  end
end

What tools can I use for TDD in Rails?

You can use tools like RSpec for writing tests, Capybara for integration testing, and FactoryBot for setting up test data.