Fixed #1560 and update tests

lib/bundler/cli.rb

@@ -579,6 +579,7 @@ def clean
         Bundler.load.clean
       else
         Bundler.ui.error "Can only use bundle clean when --path is set or --force is set"
+        exit 1
       end
     end
 

spec/other/clean_spec.rb

@@ -239,8 +239,9 @@ def should_not_have_gems(*gems)
       gem "rack", "1.0.0"
     G
 
-    bundle :clean
+    bundle :clean, :exitstatus => true
 
+    exitstatus.should eq(1)
     out.should == "Can only use bundle clean when --path is set or --force is set"
   end
 
@@ -440,10 +441,12 @@ def should_not_have_gems(*gems)
       gem "bindir"
     G
     bundle :install
+
     bundle "clean --force"
 
     sys_status "foo"
-    @existstatus.should_not == 0
+
+    exitstatus.should == 0
     out.should == "1.0"
   end
 end

spec/spec_helper.rb

@@ -6,6 +6,7 @@
 require 'bundler'
 require 'rspec'
 require 'uri'
+require 'digest/sha1'
 
 # Require the correct version of popen for the current platform
 if RbConfig::CONFIG['host_os'] =~ /mingw|mswin/
@@ -95,4 +96,3 @@ def pending_jruby_shebang_fix
     ENV['BUNDLE_APP_CONFIG']     = nil
   end
 end
-