verify RSpec and its configuration object are defined

Matthew Erhard · Matthew Erhard · commit f17a93f2d904 · 2014-08-21T13:15:59.000-04:00
diff --git a/lib/spring/commands/rspec.rb b/lib/spring/commands/rspec.rb
@@ -14,7 +14,7 @@ def gem_name
       end
 
       def call
-        ::RSpec.configuration.start_time = Time.now
+        ::RSpec.configuration.start_time = Time.now if defined?(::RSpec.configuration)
         load Gem.bin_path(gem_name, exec_name)
       end
     end
