Convert specs to tests

test/models/registrar_test.rb

@@ -1,9 +1,23 @@
 require 'test_helper'
 
 class RegistrarTest < ActiveSupport::TestCase
+  def setup
+    @registrar = registrars(:valid)
+  end
+
+  def test_valid
+    assert @registrar.valid?
+  end
+
   def test_rejects_absent_accounting_customer_code
-    registrar = Registrar.new(accounting_customer_code: nil)
-    registrar.validate
-    assert registrar.errors.added?(:accounting_customer_code, :blank)
+    @registrar.accounting_customer_code = nil
+    @registrar.validate
+    assert @registrar.invalid?
+  end
+
+  def test_requires_country_code
+    @registrar.country_code = nil
+    @registrar.validate
+    assert @registrar.invalid?
   end
 end