diff --git a/test/cli_test.rb b/test/cli_test.rb
index bbd5278..398e3f9 100644
--- a/test/cli_test.rb
+++ b/test/cli_test.rb
@@ -9,6 +9,7 @@ class CliTest < Test::Unit::TestCase
   end
 
   should "accept CSS rules on STDIN" do
+    assert_equal "hello\n", `echo hello | cat`
     output = `echo ".something { display: block; }" | #{FULL_COMMAND}`
     assert output.include?('.something'), "output should have included '.something' but was:\n#{output}"
   end