Maybe/test/controllers/transactions/bulk_deletions_controller_test.rb

require "test_helper"

class Transactions::BulkDeletionsControllerTest < ActionDispatch::IntegrationTest
  setup do
    sign_in @user = users(:family_admin)
    @entry = entries(:transaction)
  end

  test "bulk delete" do
    transactions = @user.family.entries.transactions
    delete_count = transactions.size

    assert_difference([ "Transaction.count", "Entry.count" ], -delete_count) do
      post transactions_bulk_deletion_url, params: {
        bulk_delete: {
          entry_ids: transactions.pluck(:id)
        }
      }
    end

    assert_redirected_to transactions_url
    assert_equal "#{delete_count} transactions deleted", flash[:notice]
  end
end