[BridgeSupportSpec] Fix execution

spec/unit/generator/bridge_support_spec.rb

 require File.expand_path('../../../spec_helper', __FILE__)
 
-describe 'Pod::Generator::BridgeSupport' do
+module Pod
+  describe 'Pod::Generator::BridgeSupport' do
     if Executable.which('gen_bridge_metadata').nil?
       puts '  ! '.red << "Skipping because the `gen_bridge_metadata` executable can't be found."
     else
       it 'generates a metadata file with the appropriate search paths' do
         headers = %w(/some/dir/foo.h /some/dir/bar.h /some/other/dir/baz.h).map { |h| Pathname.new(h) }
-      generator = Pod::Generator::BridgeSupport.new(headers)
+        generator = Generator::BridgeSupport.new(headers)
         expected = ['-c', "-I '/some/dir' -I '/some/other/dir'", '-o', '/path/to/Pods.bridgesupport', *headers]
         generator.expects(:gen_bridge_metadata).with { |*command| command.map(&:to_s) == expected.map(&:to_s) }
         generator.save_as(Pathname.new('/path/to/Pods.bridgesupport'))
       end
     end
+  end
 end