Add initial models and corresponding test files

spec/models/address_spec.rb

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+require "rails_helper"
+
+describe Address do
+  it { should belong_to(:contact) }
+  it { should belong_to(:country) }
+end

spec/models/contact_spec.rb

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+require "rails_helper"
+
+describe Contact do
+  it { should have_many(:addresses) }
+end

spec/models/domain_spec.rb

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+require "rails_helper"
+
+describe Domain do
+  it { should belong_to(:registrar) }
+  it { should belong_to(:ns_set) }
+  it { should belong_to(:admin_contact) }
+  it { should belong_to(:owner_contact) }
+  it { should belong_to(:technical_contact) }
+
+  it 'creates a resource' do
+    d = Fabricate(:domain)
+    expect(d.name).to_not be_nil
+  end
+end

spec/models/nameserver_spec.rb

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+require "rails_helper"
+
+describe Nameserver do
+  it { should have_and_belong_to_many(:ns_sets) }
+end

spec/models/ns_set_spec.rb

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+require "rails_helper"
+
+describe NsSet do
+  it { should belong_to(:registrar)}
+  it { should have_and_belong_to_many(:nameservers) }
+end

spec/models/registrar_spec.rb

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+require "rails_helper"
+
+describe Registrar do
+  it { should belong_to(:country) }
+  it { should have_many(:domains) }
+  it { should have_many(:ns_sets) }
+end

spec/models/right_spec.rb

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+require "rails_helper"
+
+describe Right do
+  it { should have_and_belong_to_many(:roles) }
+end

spec/models/role_spec.rb

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+require "rails_helper"
+
+describe Role do
+  it { should have_and_belong_to_many(:rights) }
+end

spec/models/user_spec.rb

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+require "rails_helper"
+
+describe User do
+  it { should belong_to(:role) }
+end