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Testing User Registration Controller Implementation in Maybe Finance

This test suite validates the registration functionality in the Maybe Finance application, focusing on user creation flows and invite code requirements. The tests ensure proper handling of user registration endpoints and validation of invite codes in hosted environments.

Test Coverage Overview

The test suite provides comprehensive coverage of the registration controller functionality:

Basic registration page accessibility
Standard user registration flow with redirects
Invite code validation for hosted environments
Edge cases for invalid and valid invite codes

Integration points include User model creation and environment-specific behaviors.

Implementation Analysis

The testing approach utilizes ActionDispatch::IntegrationTest for end-to-end validation of registration flows. The implementation leverages Minitest assertions and Rails testing patterns, including environment overrides for conditional testing scenarios.

Key patterns include request simulation using get/post helpers and database state verification through assert_difference blocks.

Technical Details

Testing tools and configuration:

Minitest as the testing framework
ActionDispatch for integration testing
Environment override helpers for conditional testing
Custom InviteCode generation utility
Database state assertions for user creation verification

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolation of test scenarios using environment overrides
Explicit state verification through database counts
Clear test case organization and naming
Comprehensive coverage of success and failure paths
Proper setup and teardown of test conditions

maybe-finance/maybe

test/controllers/registrations_controller_test.rb

            
require "test_helper"

class RegistrationsControllerTest < ActionDispatch::IntegrationTest
  test "new" do
    get new_registration_url
    assert_response :success
  end

  test "create redirects to correct URL" do
    post registration_url, params: { user: {
      email: "[email protected]",
      password: "password",
      password_confirmation: "password" } }

    assert_redirected_to root_url
  end

  test "create when hosted requires an invite code" do
    with_env_overrides REQUIRE_INVITE_CODE: "true" do
      assert_no_difference "User.count" do
        post registration_url, params: { user: {
          email: "[email protected]",
          password: "password",
          password_confirmation: "password" } }
        assert_redirected_to new_registration_url

        post registration_url, params: { user: {
          email: "[email protected]",
          password: "password",
          password_confirmation: "password",
          invite_code: "foo" } }
        assert_redirected_to new_registration_url
      end

      assert_difference "User.count", +1 do
        post registration_url, params: { user: {
          email: "[email protected]",
          password: "password",
          password_confirmation: "password",
          invite_code: InviteCode.generate! } }
        assert_redirected_to root_url
      end
    end
  end
end