avoid namespace conflict with Guard::Bundler

lib/guard/puppet/runner.rb

@@ -50,7 +50,7 @@ module Guard
       private
       def maybe_bundle_with_env(&block)
         if defined?(::Bundler)
-          Bundler.with_clean_env(&block)
+          ::Bundler.with_clean_env(&block)
         else
           yield
         end

spec/lib/guard/puppet/runner_spec.rb

@@ -32,11 +32,11 @@ describe Guard::Puppet::Runner do
   end
 
   describe '#run' do
+    context 'returns a non-zero value' do
       before do
         ::Puppet::Util::CommandLine.expects(:new).raises(SystemExit.new(return_value))
       end
 
-    context 'returns a non-zero value' do
       let(:return_value) { 10 }
 
       it 'should return the result of an exit call' do
@@ -44,6 +44,27 @@ describe Guard::Puppet::Runner do
       end
     end
 
+    context 'when bundler is used' do
+      before do
+        module ::Guard
+          class Bundler
+            def self.with_clean_env
+              fail "Called with_clean_env on Guard::Bundler instead of Bundler"
+            end
+          end
+        end
+      end
+
+      it 'uses a clean env' do
+        ran = false
+        ::Bundler.stubs(:with_clean_env).with() do
+          ran = true
+        end
+        runner.run
+        ran.should == true
+      end
+    end
+
     context 'returns a zero value' do
       let(:return_value) { 0 }
       let(:messages) do