Fix EU plaid flow (#1761)

* Fix EU plaid flow

* Fix failing tests

test/controllers/plaid_items_controller_test.rb

@@ -4,13 +4,12 @@ require "ostruct"
 class PlaidItemsControllerTest < ActionDispatch::IntegrationTest
   setup do
     sign_in @user = users(:family_admin)
-
-    @plaid_provider = mock
-
-    PlaidItem.stubs(:plaid_provider).returns(@plaid_provider)
   end
 
   test "create" do
+    @plaid_provider = mock
+    PlaidItem.expects(:plaid_provider_for_region).with("us").returns(@plaid_provider)
+
     public_token = "public-sandbox-1234"
 
     @plaid_provider.expects(:exchange_public_token).with(public_token).returns(

test/interfaces/accountable_resource_interface_test.rb

@@ -4,9 +4,7 @@ module AccountableResourceInterfaceTest
   extend ActiveSupport::Testing::Declarative
 
   test "shows new form" do
-    Plaid::PlaidApi.any_instance.stubs(:link_token_create).returns(
-      Plaid::LinkTokenCreateResponse.new(link_token: "test-link-token")
-    )
+    Family.any_instance.stubs(:get_link_token).returns("test-link-token")
 
     get new_polymorphic_url(@account.accountable)
     assert_response :success