prepend 'bundle exec' in rake task

- Fixes rspec#426.

Rakefile

@@ -28,7 +28,6 @@ Cucumber::Rake::Task.new(:cucumber)
 desc "Run all examples"
 RSpec::Core::RakeTask.new(:spec) do |t|
   t.rspec_opts = %w[--color]
-  t.verbose = false
 end
 
 if RUBY_VERSION.to_f == 1.8

features/command_line/rake_task.feature

@@ -20,7 +20,7 @@ Feature: rake task
       end
       """
     When I run `rake`
-    Then the stderr should contain "ruby -S rspec"
+    Then the output should contain "ruby -S rspec"
     Then the exit status should be 0
 
   Scenario: default options with failing spec (exit status is 1)

lib/rspec/core/rake_task.rb

@@ -1,5 +1,3 @@
-#!/usr/bin/env ruby
-
 require 'rspec/core'
 require 'rspec/core/deprecation'
 require 'rake'
@@ -133,11 +131,12 @@ def initialize(*args)
               puts "No examples matching #{pattern} could be found"
             else
               begin
-                ruby(spec_command)
+                puts spec_command if verbose
+                success = system(spec_command)
               rescue
                 puts failure_message if failure_message
-                raise("ruby #{spec_command} failed") if fail_on_error
               end
+              raise("ruby #{spec_command} failed") if fail_on_error unless success
             end
           end
         end
@@ -155,10 +154,12 @@ def files_to_run # :nodoc:
 
       def spec_command
         @spec_command ||= begin
-                            cmd_parts = [ruby_opts]
+                            cmd_parts = []
+                            cmd_parts << "bundle exec" if gemfile? unless skip_bundler
+                            cmd_parts << RUBY
+                            cmd_parts << ruby_opts
                             cmd_parts << "-w" if warning?
                             cmd_parts << "-S"
-                            cmd_parts << "bundle exec" if gemfile? unless skip_bundler
                             cmd_parts << runner
                             if rcov
                               cmd_parts << ["-Ispec#{File::PATH_SEPARATOR}lib", rcov_opts]

spec/rspec/core/rake_task_spec.rb

@@ -5,6 +5,10 @@ module RSpec::Core
   describe RakeTask do
     let(:task) { RakeTask.new }
 
+    def ruby
+      FileUtils::RUBY
+    end
+
     before do
       File.stub(:exist?) { false }
     end
@@ -26,7 +30,7 @@ def spec_command
 
     context "default" do
       it "renders rspec" do
-        spec_command.should =~ /^-S rspec/
+        spec_command.should =~ /^#{ruby} -S rspec/
       end
     end
 
@@ -60,7 +64,7 @@ def spec_command
     context "with rcov" do
       it "renders rcov" do
         with_rcov do
-          spec_command.should =~ /^-S rcov/
+          spec_command.should =~ /^#{ruby} -S rcov/
         end
       end
     end
@@ -69,7 +73,7 @@ def spec_command
       it "renders bundle exec rcov" do
         with_bundler do
           with_rcov do
-            spec_command.should =~ /^-S bundle exec rcov/
+            spec_command.should =~ /^bundle exec #{ruby} -S rcov/
           end
         end
       end
@@ -78,7 +82,7 @@ def spec_command
     context "with ruby options" do
       it "renders them before -S" do
         task.ruby_opts = "-w"
-        spec_command.should =~ /^-w -S rspec/
+        spec_command.should =~ /^#{ruby} -w -S rspec/
       end
     end