[TargetInspector] List all native targets when user target isn't found

lib/cocoapods/installer/analyzer/target_inspector.rb

+require 'active_support/core_ext/array/conversions'
+
 module Pod
   class Installer
     class Analyzer
@@ -103,9 +105,11 @@ module Pod
         def compute_targets(user_project)
           native_targets = user_project.native_targets
           target = native_targets.find { |t| t.name == target_definition.name.to_s }
-          targets = [target].compact
-          raise Informative, "Unable to find a target named `#{target_definition.name}`" if targets.empty?
-          targets
+          unless target
+            found = native_targets.map { |t| "`#{t.name}`" }.to_sentence
+            raise Informative, "Unable to find a target named `#{target_definition.name}`, did find #{found}."
+          end
+          [target]
         end
 
         # @param  [Array<PBXNativeTarget] the user's targets of the project of

spec/unit/installer/analyzer/target_inspector_spec.rb

@@ -77,6 +77,18 @@ module Pod
         e.message.should.match /Unable to find a target named `UserTarget`/
       end
 
+      it 'suggests project native target names if the target cannot be found' do
+        target_definition = Podfile::TargetDefinition.new('UserTarget', nil)
+        user_project = Xcodeproj::Project.new('path')
+        user_project.new_target(:application, 'FirstTarget', :ios)
+        user_project.new_target(:application, 'SecondTarget', :ios)
+        user_project.new_target(:application, 'ThirdTarget', :ios)
+
+        target_inspector = TargetInspector.new(target_definition, config.installation_root)
+        e = lambda { target_inspector.send(:compute_targets, user_project) }.should.raise Informative
+        e.message.should.include 'did find `FirstTarget`, `SecondTarget`, and `ThirdTarget`.'
+      end
+
       it 'returns the target with the same name of the target definition' do
         target_definition = Podfile::TargetDefinition.new('UserTarget', nil)
         user_project = Xcodeproj::Project.new('path')