How do I test custom methods in Rails?

How do I test custom methods in Rails?

To test custom methods in Rails, you can use RSpec or Minitest. Which one are you using?

I'm using RSpec. Can you give me an example?

Sure! You can create a spec file in the spec/models directory. For example, if you have a method calculate_discount, you would write:

require 'rails_helper'

RSpec.describe Product, type: :model do
  describe '#calculate_discount' do
    it 'returns the correct discount' do
      product = Product.new(price: 100)
      expect(product.calculate_discount(10)).to eq(90)
    end
  end
end

What if my method interacts with the database?

In that case, you can use let to create test data and ensure your tests are wrapped in a transaction to maintain database integrity.