Spec for #2102

spec/unit/executable_spec.rb

+require File.expand_path('../../spec_helper', __FILE__)
+
+module Pod
+  describe Executable do
+    it 'shows the actual command on failure' do
+      e = lambda { Executable.execute_command('false',
+        '', true) }.should.raise Informative
+      e.message.should.match(/false/)
+    end
+  end
+end