Add champ address model

spec/models/champs/address_champ_spec.rb

@@ -0,0 +1,20 @@
+describe Champs::AddressChamp do
+  let(:champ) { Champs::AddressChamp.new(value: value, data: data, type_de_champ: create(:type_de_champ_address)) }
+  let(:value) { '' }
+  let(:data) { nil }
+
+  context "with value but no data" do
+    let(:value) { 'Paris' }
+
+    it { expect(champ.address_label).to eq('Paris') }
+    it { expect(champ.full_address?).to be_falsey }
+  end
+
+  context "with value and data" do
+    let(:value) { 'Paris' }
+    let(:data) { { label: 'Paris' } }
+
+    it { expect(champ.address_label).to eq('Paris') }
+    it { expect(champ.full_address?).to be_truthy }
+  end
+end