diff --git a/lib/vulcano/backend/specinfra.rb b/lib/vulcano/backend/specinfra.rb
index c4b9f8c00..2ab65e808 100644
--- a/lib/vulcano/backend/specinfra.rb
+++ b/lib/vulcano/backend/specinfra.rb
@@ -171,7 +171,7 @@ module Vulcano::Backends
         path = Shellwords.escape(@path)
         raw_type = Specinfra::Runner.run_command("stat -c %f #{path}").stdout
         tmask = raw_type.to_i(16)
-        res = TYPES.find{|name, mask| mask & tmask}
+        res = TYPES.find{|name, mask| mask & tmask == mask}
         return :unknown if res.nil?
         res[0]
       end
diff --git a/test/docker.rb b/test/docker.rb
index 224305f50..df39379a9 100644
--- a/test/docker.rb
+++ b/test/docker.rb
@@ -2,8 +2,11 @@ require 'docker'
 require 'yaml'
 require_relative '../lib/vulcano'
 
-tests = ARGV.drop(1)
-exit 0 if tests.empty?
+tests = ARGV
+if tests.empty?
+  puts 'Nothing to do.'
+  exit 0
+end
 
 class DockerTester
   def initialize(tests)
diff --git a/test/resource/file.rb b/test/resource/file.rb
new file mode 100644
index 000000000..71345c136
--- /dev/null
+++ b/test/resource/file.rb
@@ -0,0 +1,4 @@
+
+describe file('/tmp') do
+  its(:type) { should eq :directory }
+end