Integrate money-rails gem (#268)

* Integrate money-rails gem

* Fix Lint issues

* Basic test for monetize feature

* Merge main branch

* Changes to monetize balance field

---------

Co-authored-by: Zach Gollwitzer <zach.gollwitzer@gmail.com>

test/models/account_test.rb

@@ -1,11 +1,31 @@
 require "test_helper"
 
 class AccountTest < ActiveSupport::TestCase
-  test "new account should be valid" do
+  def setup
     depository = Account::Depository.create!
-    account = Account.create!(family: families(:dylan_family), name: "Explicit Checking", balance: 1200, accountable: depository)
-    assert account.valid?
-    assert_not_nil account.accountable_id
-    assert_not_nil account.accountable
+    @account = Account.create!(family: families(:dylan_family), name: "Explicit Checking", balance_cents: 1200, accountable: depository)
+  end
+
+  test "new account should be valid" do
+    assert @account.valid?
+    assert_not_nil @account.accountable_id
+    assert_not_nil @account.accountable
+  end
+
+  test "balance returns Money object" do
+    @account.balance = 10
+    assert_instance_of Money, @account.balance
+    assert_equal :usd, @account.balance.currency.id
+  end
+
+  test "correctly assigns Money objects to the attribute" do
+    @account.balance = Money.new(2500, "USD")
+    assert_equal 2500, @account.balance_cents
+  end
+
+  test "balance_cents can be updated" do
+    new_balance = Money.new(10000, "USD")
+    @account.balance = new_balance
+    assert_equal new_balance, @account.balance
   end
 end