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Testing Plaid Item Removal Workflow in Maybe Finance

This test suite validates the PlaidItem model functionality in the Maybe Finance application, focusing on item removal and syncable interface implementation. The tests ensure proper integration with the Plaid API and verify cleanup operations.

Test Coverage Overview

The test suite provides coverage for critical PlaidItem operations, particularly the destruction process and Plaid API integration.

Tests item removal functionality
Verifies Plaid API interaction during deletion
Implements SyncableInterfaceTest module
Validates access token handling

Implementation Analysis

The testing approach utilizes Minitest’s mocking capabilities to isolate Plaid API interactions. The implementation leverages stub and mock patterns to control external dependencies, ensuring reliable test execution.

Uses mock objects for Plaid provider
Implements stub methods for provider access
Employs assertion counting for API calls

Technical Details

Testing Framework: Minitest
Mocking Library: Built-in Minitest mocks
Fixtures: Used for test data setup
Setup Hooks: Implements setup method for test initialization
Assertion Methods: assert_difference for count validation

Best Practices Demonstrated

The test suite demonstrates several testing best practices, including proper isolation of external dependencies and clear test organization. It effectively uses mocking to prevent actual API calls while maintaining test validity.

Proper test isolation
Clear setup and teardown
Explicit expectations
Resource cleanup verification

maybe-finance/maybe

test/models/plaid_item_test.rb

            
require "test_helper"

class PlaidItemTest < ActiveSupport::TestCase
  include SyncableInterfaceTest

  setup do
    @plaid_item = @syncable = plaid_items(:one)
  end

  test "removes plaid item when destroyed" do
    @plaid_provider = mock

    PlaidItem.stubs(:plaid_provider).returns(@plaid_provider)

    @plaid_provider.expects(:remove_item).with(@plaid_item.access_token).once

    assert_difference "PlaidItem.count", -1 do
      @plaid_item.destroy
    end
  end
end