FEATURE: Add revoke and reconnect functionality for google logins

spec/components/auth/google_oauth2_authenticator_spec.rb

@@ -58,6 +58,35 @@ describe Auth::GoogleOAuth2Authenticator do
       expect(result.user.id).to eq(user.id)
     end
 
+    it 'can connect to a different existing user account' do
+      authenticator = Auth::GoogleOAuth2Authenticator.new
+      user1 = Fabricate(:user)
+      user2 = Fabricate(:user)
+
+      GoogleUserInfo.create!(user_id: user1.id, google_user_id: 100)
+
+      hash = {
+        uid: "100",
+        info: {
+            name: "John Doe",
+            email: user1.email
+        },
+        extra: {
+          raw_info: {
+            email: user1.email,
+            email_verified: true,
+            name: "John Doe"
+          }
+        }
+      }
+
+      result = authenticator.after_authenticate(hash, existing_account: user2)
+
+      expect(result.user.id).to eq(user2.id)
+      expect(GoogleUserInfo.exists?(user_id: user1.id)).to eq(false)
+      expect(GoogleUserInfo.exists?(user_id: user2.id)).to eq(true)
+    end
+
     it 'can create a proper result for non existing users' do
       hash = {
         uid: "123456789",
@@ -81,4 +110,21 @@ describe Auth::GoogleOAuth2Authenticator do
       expect(result.extra_data[:name]).to eq("Jane Doe")
     end
   end
+
+  context 'revoke' do
+    let(:user) { Fabricate(:user) }
+    let(:authenticator) { Auth::GoogleOAuth2Authenticator.new }
+
+    it 'raises exception if no entry for user' do
+      expect { authenticator.revoke(user) }.to raise_error(Discourse::NotFound)
+    end
+
+      it 'revokes correctly' do
+        GoogleUserInfo.create!(user_id: user.id, google_user_id: 12345, email: 'someuser@somedomain.tld')
+        expect(authenticator.can_revoke?).to eq(true)
+        expect(authenticator.revoke(user)).to eq(true)
+        expect(authenticator.description_for_user(user)).to eq("")
+      end
+
+  end
 end