test: User.find_or_create_from_auth_hash!メソッドのテストを作成 (#66)

spec/models/user_spec.rb

@@ -57,4 +57,53 @@
     user2 = FactoryBot.build(:user, name: 'tester2', image_url: 'example.com/2', provider: 'twitter')
     expect(user2).to be_valid
   end
+
+  describe '.find_or_create_from_auth_hash!' do
+    let(:auth_hash) do
+      {
+        provider: 'github',
+        uid: '0001',
+        info: {
+          nickname: 'testuser',
+          image: 'https://example.com/testuser.png'
+        }
+      }
+    end
+
+    context 'when user does not exist' do
+      it 'creates a new user' do
+        expect do
+          User.find_or_create_from_auth_hash!(auth_hash)
+        end.to change(User, :count).by(1)
+      end
+
+      it 'returns the created user' do
+        user = User.find_or_create_from_auth_hash!(auth_hash)
+        expect(user).to be_a(User)
+        expect(user.provider).to eq('github')
+        expect(user.uid).to eq('0001')
+        expect(user.name).to eq('testuser')
+        expect(user.image_url).to eq('https://example.com/testuser.png')
+      end
+    end
+
+    context 'when user already exists' do
+      let!(:existing_user) { FactoryBot.create(:user) }
+
+      it 'does not create a new user' do
+        expect do
+          User.find_or_create_from_auth_hash!(auth_hash)
+        end.not_to change(User, :count)
+      end
+
+      it 'returns the existing user' do
+        user = User.find_or_create_from_auth_hash!(auth_hash)
+        expect(user).to be_a(User)
+        expect(user.provider).to eq('github')
+        expect(user.uid).to eq('0001')
+        expect(user.name).to eq('tester1')
+        expect(user.image_url).to eq('example.com/1')
+      end
+    end
+  end
 end