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Testing Account Transfer Operations in Maybe Finance

This test suite validates the functionality of account transfers in a financial application, focusing on creating, retrieving, and deleting transfer operations between accounts. The tests ensure proper handling of transfer transactions and associated account updates.

Test Coverage Overview

The test suite provides comprehensive coverage of account transfer operations including:

New transfer form rendering
Transfer creation with validation
Transfer deletion with associated transaction cleanup
Account balance synchronization

Key integration points include the SyncJob for balance updates and transaction management across multiple accounts.

Implementation Analysis

The implementation uses ActionDispatch::IntegrationTest for end-to-end testing of transfer controller actions. The tests employ fixture data for accounts and users, with specific assertions for database record changes using assert_difference. The testing approach validates both the HTTP responses and the side effects on the database state.

Notable patterns include multi-statement difference assertions and job enqueuing verification.

Technical Details

Testing Framework: Minitest
Rails Integration Testing
Fixtures for test data
ActiveJob testing helpers
Database transaction tracking
Controller response validation

Best Practices Demonstrated

The test suite exemplifies several testing best practices including isolated test setup, comprehensive state verification, and proper cleanup of resources. Each test focuses on a single responsibility while maintaining complete coverage of the transfer lifecycle. The use of fixtures and helper methods promotes test maintainability and readability.

Clear test naming conventions
Proper setup and teardown
Comprehensive state verification
Background job testing

maybe-finance/maybe

test/controllers/account/transfers_controller_test.rb

            
require "test_helper"

class Account::TransfersControllerTest < ActionDispatch::IntegrationTest
  setup do
    sign_in users(:family_admin)
  end

  test "should get new" do
    get new_account_transfer_url
    assert_response :success
  end

  test "can create transfers" do
    assert_difference "Account::Transfer.count", 1 do
      post account_transfers_url, params: {
        account_transfer: {
          from_account_id: accounts(:depository).id,
          to_account_id: accounts(:credit_card).id,
          date: Date.current,
          amount: 100,
          name: "Test Transfer"
        }
      }
      assert_enqueued_with job: SyncJob
    end
  end

  test "can destroy transfer" do
    assert_difference -> { Account::Transfer.count } => -1, -> { Account::Transaction.count } => -2 do
      delete account_transfer_url(account_transfers(:one))
    end
  end
end