1006-testing

Testing Standards

Context

• In Ruby on Rails 8.0 test files
• Using Minitest for testing
• Tests should be thorough and maintainable

Requirements

• Use Minitest for all tests
• Write tests for models, controllers, services, and other components
• Use fixtures for test data
• Organize tests into appropriate test classes
• Use descriptive test names with test_ prefix (e.g., test_valid_user_can_login)
• Use assertions that best match what you're testing
• Keep tests focused on a single concern
• Use setup/teardown methods for common setup code
• Use test helpers for reusable test code
• Test both happy and sad paths
• Test edge cases and boundary conditions
• Avoid testing the framework itself
• Keep tests independent and idempotent
• Don't pipe test output into cat (bin/rails test not bin/rails test | cat)

Examples

class UserTest < ActiveSupport::TestCase setup do @user = users(:one) @account = accounts(:one) end

test "valid user" do assert @user.valid? end

test "invalid without email" do @user.email = nil refute @user.valid? assert_not_nil @user.errors[:email] end

test "can be assigned to account" do account_user = AccountUser.new(user: @user, account: @account) assert account_user.valid? end

test "can have admin role" do account_user = AccountUser.new(user: @user, account: @account, admin: true) assert account_user.admin? assert_includes account_user.active_roles, :admin end end

</example>

<example type="invalid">
```ruby
require "test_helper"

class UserTest < ActiveSupport::TestCase
  def setup
    @user = User.new(name: "Test User", email: "[email protected]")
  end

  def test_it_works
    @user.save
    assert_equal 1, User.count
    User.all.each do |u|
      assert u.valid?
    end
    @user.update(email: nil)
    assert_equal false, @user.valid?
  end
end