FEATURE: Allow revoke and connect for GitHub logins

spec/components/auth/github_authenticator_spec.rb

@@ -202,6 +202,36 @@ describe Auth::GithubAuthenticator do
       expect(result.email_valid).to eq(true)
     end
 
+    it 'can connect to a different existing user account' do
+      user1 = Fabricate(:user)
+      user2 = Fabricate(:user)
+
+      GithubUserInfo.create!(user_id: user1.id, github_user_id: 100, screen_name: "boris")
+
+      result = authenticator.after_authenticate(data, existing_account: user2)
+
+      expect(result.user.id).to eq(user2.id)
+      expect(GithubUserInfo.exists?(user_id: user1.id)).to eq(false)
+      expect(GithubUserInfo.exists?(user_id: user2.id)).to eq(true)
+    end
+
+  end
+
+  context 'revoke' do
+    let(:user) { Fabricate(:user) }
+    let(:authenticator) { Auth::GithubAuthenticator.new }
+
+    it 'raises exception if no entry for user' do
+      expect { authenticator.revoke(user) }.to raise_error(Discourse::NotFound)
+    end
+
+      it 'revokes correctly' do
+        GithubUserInfo.create!(user_id: user.id, github_user_id: 100, screen_name: "boris")
+        expect(authenticator.can_revoke?).to eq(true)
+        expect(authenticator.revoke(user)).to eq(true)
+        expect(authenticator.description_for_user(user)).to eq("")
+      end
+
   end
 
   describe 'avatar retrieval' do