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Testing Category Management System Implementation in Maybe Finance

This system test suite validates category management functionality in the Maybe Finance application, focusing on creation and duplicate handling scenarios. The tests ensure proper user interaction flows and data validation for the categories feature.

Test Coverage Overview

The test suite covers essential category management operations with specific focus on creation workflows and validation rules.

Category creation with valid data
Duplicate category name validation
User authentication integration
UI interaction verification

Implementation Analysis

The implementation utilizes Minitest’s system testing capabilities to simulate real user interactions with the application. The tests employ page navigation, form interactions, and assertion checks to validate the category management workflow.

ApplicationSystemTestCase inheritance
Setup with user authentication
I18n integration for localized text
Click and form fill interactions

Technical Details

Framework: Minitest system tests
Authentication: Custom sign_in helper
Fixtures: User and category data
Assertions: Text presence verification
Browser automation: Built-in Rails system testing

Best Practices Demonstrated

The test suite demonstrates several testing best practices including proper test isolation, meaningful assertions, and clear test case organization.

Independent test cases
Explicit setup procedures
Clear naming conventions
Focused test scenarios
Error case coverage

maybe-finance/maybe

test/system/categories_test.rb

            
require "application_system_test_case"

class CategoriesTest < ApplicationSystemTestCase
  setup do
    sign_in @user = users(:family_admin)
  end

  test "can create category" do
    visit categories_url
    click_link I18n.t("categories.new.new_category")
    fill_in "Name", with: "My Shiny New Category"
    click_button "Create Category"

    visit categories_url
    assert_text "My Shiny New Category"
  end

  test "trying to create a duplicate category fails" do
    visit categories_url
    click_link I18n.t("categories.new.new_category")
    fill_in "Name", with: categories(:food_and_drink).name
    click_button "Create Category"

    assert_text "Name has already been taken"
  end
end