sessions: add a helper to clear the stored return path

spec/controllers/devise/store_location_extension_spec.rb

@@ -0,0 +1,26 @@
+require 'rails_helper'
+
+RSpec.describe Devise::StoreLocationExtension, type: :controller do
+  class TestController < ActionController::Base
+    include Devise::Controllers::StoreLocation
+    include Devise::StoreLocationExtension
+  end
+
+  controller TestController do
+  end
+
+  describe "#clear_stored_location_for" do
+    context 'when a location has been previously stored' do
+      before { subject.store_location_for(:user, dossiers_path) }
+
+      it 'delete the stored location' do
+        subject.clear_stored_location_for(:user)
+        expect(subject.stored_location_for(:user)).to be nil
+      end
+    end
+
+    context 'when no location has been stored' do
+      it { expect(subject.clear_stored_location_for(:user)).to be nil }
+    end
+  end
+end