validate uniq symbol_type count instead of user_target count

lib/cocoapods/installer/analyzer.rb

@@ -238,8 +238,10 @@ module Pod
       #
       def copy_extension_pod_targets_to_host(aggregate_target, extension_aggregate_targets)
         return if aggregate_target.requires_host_target?
-        # Get the uuids of the aggregate_target's user_target's extension targets if any
-        extension_uuids = aggregate_target.user_project.extensions_for_native_target(aggregate_target.user_targets[0]).map(&:uuid)
+        # Get the uuids of the aggregate_target's user_targets' extension targets if any
+        extension_uuids = aggregate_target.user_targets.map do |target|
+          aggregate_target.user_project.extensions_for_native_target(target).map(&:uuid)
+        end.flatten
         return if extension_uuids.empty?
         extension_aggregate_targets.each do |extension_target|
           next unless extension_uuids.include? extension_target.user_targets[0].uuid

lib/cocoapods/target/aggregate_target.rb

@@ -37,8 +37,9 @@ module Pod
       # for sure that this target refers to an extension
       # target that would require a host target
       return false if user_project.nil?
-      raise ArgumentError, "Expected single user_target for #{name}" unless user_targets.count == 1
-      EMBED_FRAMEWORKS_IN_HOST_TARGET_TYPES.include? user_targets[0].symbol_type
+      symbol_types = user_targets.map(&:symbol_type).uniq
+      raise ArgumentError, "Expected single kind of user_target for #{name}. Found #{symbol_types.join(', ')}." unless symbol_types.count == 1
+      EMBED_FRAMEWORKS_IN_HOST_TARGET_TYPES.include? symbol_types[0]
     end
 
     # @return [String] the label for the target.

spec/unit/target/aggregate_target_spec.rb

@@ -230,11 +230,13 @@ module Pod
             @target.requires_host_target?.should == false
           end
 
-          it 'raises an exception if more than one user_target is found' do
-            @target.user_target_uuids += @target.user_target_uuids
+          it 'raises an exception if more than one kind of user_target is found' do
+            @target.user_target_uuids << '51075D491521D0C100E39B41'
+            @target.user_targets.first.stubs(:symbol_type).returns(:app_extension)
+            @target.user_targets.last.stubs(:symbol_type).returns(:watch_extension)
             should.raise ArgumentError do
               @target.requires_host_target?
-            end.message.should.equal 'Expected single user_target for Pods'
+            end.message.should.equal 'Expected single kind of user_target for Pods. Found app_extension, watch_extension.'
           end
         end
       end