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Testing Category Deletion Controller Implementation in Maybe Finance

This test suite validates the functionality of category deletion operations in a financial management system. It focuses on testing both deletion with category replacement and deletion without replacement, ensuring proper transaction handling and data integrity.

Test Coverage Overview

The test suite provides comprehensive coverage of category deletion scenarios in the application.

Key areas tested include:

Category deletion with replacement category assignment
Category deletion without replacement (null category assignment)
Transaction count verification
Proper redirect behavior

Integration points cover user authentication, category management, and transaction relationship handling.

Implementation Analysis

The testing approach utilizes Minitest’s integration testing capabilities with ActionDispatch::IntegrationTest. The implementation follows a setup-action-assert pattern, using fixtures for test data and explicit assertion counting for database changes.

Framework-specific features include:

Integration test helpers for authentication
Database transaction assertions
Route helpers for URL generation

Technical Details

Testing tools and configuration:

Minitest as the testing framework
Rails integration testing modules
Fixture-based test data setup
Database transaction handling
Authentication helpers for user context

Best Practices Demonstrated

The test suite demonstrates several testing best practices including proper test isolation through setup blocks, explicit assertion counting for database operations, and comprehensive edge case coverage.

Notable practices include:

Clear test case naming
Proper setup and teardown management
Explicit state verification
Transaction count validation
Comprehensive redirect checking

maybe-finance/maybe

test/controllers/category/deletions_controller_test.rb

            
require "test_helper"

class Category::DeletionsControllerTest < ActionDispatch::IntegrationTest
  setup do
    sign_in users(:family_admin)
    @category = categories(:food_and_drink)
  end

  test "new" do
    get new_category_deletion_url(@category)
    assert_response :success
  end

  test "create with replacement" do
    replacement_category = categories(:income)

    assert_not_empty @category.transactions

    assert_difference "Category.count", -1 do
      assert_difference "replacement_category.transactions.count", @category.transactions.count do
        post category_deletions_url(@category),
          params: { replacement_category_id: replacement_category.id }
      end
    end

    assert_redirected_to transactions_url
  end

  test "create without replacement" do
    assert_not_empty @category.transactions

    assert_difference "Category.count", -1 do
      assert_difference "Account::Transaction.where(category: nil).count", @category.transactions.count do
        post category_deletions_url(@category)
      end
    end

    assert_redirected_to transactions_url
  end
end