initial

test/integration/admin_area/accounts_test.rb

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+require 'test_helper'
+
+class AdminAreaAccountsIntegrationTest < ActionDispatch::IntegrationTest
+  include Devise::Test::IntegrationHelpers
+
+  setup do
+    sign_in users(:admin)
+    @account = accounts(:cash)
+  end
+
+  def test_index_page_accessible
+    get admin_accounts_path
+    assert_response :success
+    assert_includes response.body, 'Accounts'
+  end
+
+  def test_updates_account_balance_and_creates_activity
+    new_balance = @account.balance + 50
+
+    assert_difference 'AccountActivity.count', +1 do
+      patch admin_account_path(@account), params: {
+        account: { balance: new_balance },
+        description: 'Balance adjustment by admin'
+      }
+    end
+
+    assert_redirected_to admin_accounts_path
+    follow_redirect!
+    assert_response :success
+
+    @account.reload
+    assert_equal new_balance, @account.balance
+  end
+
+  def test_invalid_balance_shows_error_and_does_not_create_activity
+    assert_no_difference 'AccountActivity.count' do
+      patch admin_account_path(@account), params: {
+        account: { balance: 'invalid' },
+        description: 'Should fail'
+      }
+    end
+
+    assert_response :success 
+    assert_includes response.body, I18n.t('invalid_balance')
+
+    @account.reload
+    assert_equal 100, @account.balance
+  end
+end