Add loan and credit card views (#1268)

* Add loan and credit card views

* Lint fix

* Clean up overview card markup

* Lint fix

* Test fix

test/models/loan_test.rb

@@ -1,7 +1,18 @@
 require "test_helper"
 
 class LoanTest < ActiveSupport::TestCase
-  # test "the truth" do
-  #   assert true
-  # end
+  test "calculates correct monthly payment for fixed rate loan" do
+    loan_account = Account.create! \
+      family: families(:dylan_family),
+      name: "Mortgage Loan",
+      balance: 500000,
+      currency: "USD",
+      accountable: Loan.create!(
+        interest_rate: 3.5,
+        term_months: 360,
+        rate_type: "fixed"
+      )
+
+    assert_equal 2245, loan_account.loan.monthly_payment.amount
+  end
 end