Add basic invitations

spec/fixtures/invitations.yml

@@ -0,0 +1,13 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  token: fedcba654321
+  user_id: 1
+  invited_user_id: nil
+  used_at: nil
+
+two:
+  token: abcdef123456
+  user_id: 1
+  invited_user_id: nil
+  used_at: nil

spec/helpers/invitations_helper_spec.rb

@@ -0,0 +1,15 @@
+require 'rails_helper'
+
+# Specs in this file have access to a helper object that includes
+# the InvitationsHelper. For example:
+#
+# describe InvitationsHelper do
+#   describe "string concat" do
+#     it "concats two strings with spaces" do
+#       expect(helper.concat_strings("this","that")).to eq("this that")
+#     end
+#   end
+# end
+RSpec.describe InvitationsHelper, type: :helper do
+  pending "add some examples to (or delete) #{__FILE__}"
+end

spec/models/invitation_spec.rb

@@ -0,0 +1,22 @@
+require 'rails_helper'
+
+RSpec.describe Invitation, type: :model do
+  let(:user) { build :user }
+
+  describe "tokens" do
+    it "requires a user" do
+      expect { Invitation.create! }.to raise_error(ActiveRecord::RecordInvalid)
+    end
+
+    it "generates a random token when created" do
+      invitation = Invitation.new(user: user)
+      invitation.save!
+      token = invitation.token
+      expect(token).to be_a(String)
+      expect(token.length).to eq(16)
+
+      invitation_2 = Invitation.create(user: user)
+      expect(token).not_to eq(invitation_2.token)
+    end
+  end
+end