spec fixes for git -C Core updates

spec/unit/sources_manager_spec.rb

@@ -120,9 +120,15 @@ module Pod
 
       it 'prints a warning if the update failed' do
         set_up_test_repo_for_update
-        Source.any_instance.stubs(:git).with(%w(rev-parse HEAD)).returns('aabbccd')
-        Source.any_instance.stubs(:git).with(%w(diff --name-only aabbccd..HEAD)).returns('')
-        MasterSource.any_instance.expects(:git!).with(%w(pull --ff-only)).raises(<<-EOS)
+        Source.any_instance.stubs(:git).with do |options|
+          options.join(' ').should.equal %W(-C #{test_repo_path} rev-parse HEAD).join(' ')
+        end.returns('aabbccd')
+        Source.any_instance.stubs(:git).with do |options|
+          options.join(' ').should.equal %W(-C #{test_repo_path} diff --name-only aabbccd..HEAD).join(' ')
+        end.returns('')
+        MasterSource.any_instance.expects(:git!).with do |options|
+          options.join(' ').should.equal %W(-C #{test_repo_path} pull --ff-only).join(' ')
+        end.raises(<<-EOS)
 fatal: '/dev/null' does not appear to be a git repository
 fatal: Could not read from remote repository.