Require valid invitation to start sign-up process

spec/features/signup_spec.rb

@@ -0,0 +1,39 @@
+require "rails_helper"
+
+RSpec.describe "Signup", type: :feature do
+  let(:user) { create :user }
+
+  before do
+    @unused_invitation = Invitation.create(user: user)
+    @used_invitation   = Invitation.create(user: user)
+    @used_invitation.update_attribute :used_at, DateTime.now - 1.day
+  end
+
+  scenario "Follow link for non-existing invitation" do
+    visit invitation_url(id: "123")
+
+    within ".flash-msg.alert" do
+      expect(page).to have_content("doesn't exist")
+    end
+  end
+
+  scenario "Follow link for used invitation" do
+    visit invitation_url(id: @used_invitation.token)
+
+    within ".flash-msg.alert" do
+      expect(page).to have_content("has already been used")
+    end
+  end
+
+  scenario "Follow link for unused invitation" do
+    visit invitation_url(id: @unused_invitation.token)
+
+    expect(current_url).to eq(signup_url)
+    expect(page).to have_content("Welcome")
+  end
+
+  scenario "Successful signup" do
+    visit invitation_url(id: @unused_invitation.token)
+    click_link "Get started"
+  end
+end