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Testing Merchant Controller Operations in maybe-finance/maybe

This test suite implements comprehensive unit testing for the Merchants controller in a Ruby on Rails application using Minitest. It validates core CRUD operations and merchant management functionality through integration-style controller tests.

Test Coverage Overview

The test suite provides complete coverage of merchant management operations including listing, creation, updating, and deletion.

Key functionality tested includes:

Index action for merchant listing
New merchant form rendering
Merchant creation with validation
Merchant update operations
Merchant deletion with database verification

Integration points cover controller responses, database operations, and proper redirect flows.

Implementation Analysis

The testing approach follows Rails controller testing best practices using ActionDispatch::IntegrationTest.

Key patterns include:

Setup method for user authentication and fixture loading
Database assertion helpers for validating changes
Response status and redirect assertions
Params structure following Rails conventions

Technical Details

Testing tools and configuration:

Minitest as the testing framework
Rails fixture system for test data
ActionDispatch for integration testing
Authentication helpers for user context
Database cleaner for test isolation

Best Practices Demonstrated

The test suite demonstrates strong testing practices through focused test cases and proper isolation.

Notable practices include:

Proper test setup and teardown
Consistent assertion patterns
Database state verification
Authentication context handling
Clear test naming conventions

maybe-finance/maybe

test/controllers/merchants_controller_test.rb

            
require "test_helper"

class MerchantsControllerTest < ActionDispatch::IntegrationTest
  setup do
    sign_in @user = users(:family_admin)
    @merchant = merchants(:netflix)
  end

  test "index" do
    get merchants_path
    assert_response :success
  end

  test "new" do
    get new_merchant_path
    assert_response :success
  end

  test "should create merchant" do
    assert_difference("Merchant.count") do
      post merchants_url, params: { merchant: { name: "new merchant", color: "#000000" } }
    end

    assert_redirected_to merchants_path
  end

  test "should update merchant" do
    patch merchant_url(@merchant), params: { merchant: { name: "new name", color: "#000000" } }
    assert_redirected_to merchants_path
  end

  test "should destroy merchant" do
    assert_difference("Merchant.count", -1) do
      delete merchant_url(@merchant)
    end

    assert_redirected_to merchants_path
  end
end