Add support to unlink lunch flow accounts (#318)

* Add support to unlink lunch flow accounts

* add support to link and unlink to any provider

* Fix tests and query

* Let's keep Amr happy about his brand

* Wrap unlink operations in a transaction and add error handling.

* Fix tests

---------

Co-authored-by: Juan José Mata <juanjo.mata@gmail.com>

test/controllers/accounts_controller_test.rb

@@ -30,7 +30,7 @@ class AccountsControllerTest < ActionDispatch::IntegrationTest
     delete account_url(@account)
     assert_redirected_to accounts_path
     assert_enqueued_with job: DestroyJob
-    assert_equal "Account scheduled for deletion", flash[:notice]
+    assert_equal "Depository account scheduled for deletion", flash[:notice]
   end
 
   test "syncing linked account triggers sync for all provider items" do
@@ -57,4 +57,90 @@ class AccountsControllerTest < ActionDispatch::IntegrationTest
     post sync_account_url(@account)
     assert_redirected_to account_url(@account)
   end
+
+  test "confirms unlink for linked account" do
+    plaid_account = plaid_accounts(:one)
+    AccountProvider.create!(account: @account, provider: plaid_account)
+
+    get confirm_unlink_account_url(@account)
+    assert_response :success
+  end
+
+  test "redirects when confirming unlink for unlinked account" do
+    get confirm_unlink_account_url(@account)
+    assert_redirected_to account_url(@account)
+    assert_equal "Account is not linked to a provider", flash[:alert]
+  end
+
+  test "unlinks linked account successfully with new system" do
+    plaid_account = plaid_accounts(:one)
+    AccountProvider.create!(account: @account, provider: plaid_account)
+    @account.reload
+
+    assert @account.linked?
+
+    delete unlink_account_url(@account)
+    @account.reload
+
+    assert_not @account.linked?
+    assert_redirected_to accounts_path
+    assert_equal "Account unlinked successfully. It is now a manual account.", flash[:notice]
+  end
+
+  test "unlinks linked account successfully with legacy system" do
+    plaid_account = plaid_accounts(:one)
+    @account.update!(plaid_account_id: plaid_account.id)
+    @account.reload
+
+    assert @account.linked?
+
+    delete unlink_account_url(@account)
+    @account.reload
+
+    assert_not @account.linked?
+    assert_nil @account.plaid_account_id
+    assert_redirected_to accounts_path
+    assert_equal "Account unlinked successfully. It is now a manual account.", flash[:notice]
+  end
+
+  test "redirects when unlinking unlinked account" do
+    delete unlink_account_url(@account)
+    assert_redirected_to account_url(@account)
+    assert_equal "Account is not linked to a provider", flash[:alert]
+  end
+
+  test "unlinked account can be deleted" do
+    plaid_account = plaid_accounts(:one)
+    AccountProvider.create!(account: @account, provider: plaid_account)
+    @account.reload
+
+    # Cannot delete while linked
+    delete account_url(@account)
+    assert_redirected_to account_url(@account)
+    assert_equal "Cannot delete a linked account. Please unlink it first.", flash[:alert]
+
+    # Unlink the account
+    delete unlink_account_url(@account)
+    @account.reload
+
+    # Now can delete
+    delete account_url(@account)
+    assert_redirected_to accounts_path
+    assert_enqueued_with job: DestroyJob
+    assert_equal "Depository account scheduled for deletion", flash[:notice]
+  end
+
+  test "select_provider shows available providers" do
+    get select_provider_account_url(@account)
+    assert_response :success
+  end
+
+  test "select_provider redirects for already linked account" do
+    plaid_account = plaid_accounts(:one)
+    AccountProvider.create!(account: @account, provider: plaid_account)
+
+    get select_provider_account_url(@account)
+    assert_redirected_to account_url(@account)
+    assert_equal "Account is already linked to a provider", flash[:alert]
+  end
 end