Fix behavior of ldap_person method in Gitlab::OAuth::User

Code tweaks in 45e9150a caused the ldap_person method to not return expected results.
Improved tests to cover the ldap_person method, which was previously stubbed.

lib/gitlab/o_auth/user.rb

@@ -87,12 +87,13 @@ module Gitlab
       def ldap_person
         return @ldap_person if defined?(@ldap_person)
 
-        # looks for a corresponding person with same uid in any of the configured LDAP providers
-        @ldap_person = Gitlab::LDAP::Config.providers.find do |provider|
+        # Look for a corresponding person with same uid in any of the configured LDAP providers
+        Gitlab::LDAP::Config.providers.each do |provider|
           adapter = Gitlab::LDAP::Adapter.new(provider)
-
-          Gitlab::LDAP::Person.find_by_uid(auth_hash.uid, adapter)
+          @ldap_person = Gitlab::LDAP::Person.find_by_uid(auth_hash.uid, adapter)
+          break if @ldap_person
         end
+        @ldap_person
       end
 
       def ldap_config

spec/lib/gitlab/o_auth/user_spec.rb

@@ -63,13 +63,22 @@ describe Gitlab::OAuth::User do
       context "with auto_link_ldap_user enabled" do
         before { Gitlab.config.omniauth.stub auto_link_ldap_user: true }
         
+        context "and no LDAP provider defined" do
+          before { allow(Gitlab::LDAP::Config).to receive(:providers).and_return([]) }
+          
+          include_examples "to verify compliance with allow_single_sign_on"
+        end
+        
+        context "and at least one LDAP provider is defined" do
+          before { allow(Gitlab::LDAP::Config).to receive(:providers).and_return(['ldapmain']) }
+
           context "and a corresponding LDAP person" do
             before do
               ldap_user.stub(:uid) { uid }
               ldap_user.stub(:username) { uid }
               ldap_user.stub(:email) { ['johndoe@example.com','john2@example.com'] }
               ldap_user.stub(:dn) { 'uid=user1,ou=People,dc=example' }
-            allow(oauth_user).to receive(:ldap_person).and_return(ldap_user)
+              allow(Gitlab::LDAP::Person).to receive(:find_by_uid).and_return(ldap_user)
             end
   
             context "and no account for the LDAP user" do
@@ -108,11 +117,12 @@ describe Gitlab::OAuth::User do
           end
   
           context "and no corresponding LDAP person" do
-          before { allow(oauth_user).to receive(:ldap_person).and_return(nil) }
+            before { allow(Gitlab::LDAP::Person).to receive(:find_by_uid).and_return(nil) }
   
             include_examples "to verify compliance with allow_single_sign_on"
           end
         end
+      end
 
     end