diff --git a/test/verify.rb b/test/verify.rb
new file mode 100644
index 0000000..9fa1ff7
--- /dev/null
+++ b/test/verify.rb
@@ -0,0 +1,27 @@
+# Figure out what's missing from fakefs
+#
+# USAGE
+#
+#   $ ruby test/verify.rb | grep "not implemented"
+require 'fakefs'
+require 'test/unit'
+ 
+class FakeFSVerifierTest < Test::Unit::TestCase
+  (RealFile.methods - Class.new.methods).each do |name|
+    define_method("test #{name} class method") do
+      assert File.respond_to?(name), "File.#{name} not implemented"
+    end
+  end
+ 
+  (RealFile.instance_methods - Enumerable.instance_methods).each do |name|
+    define_method("test #{name} instance method") do
+      assert File.instance_methods.include?(name), "File##{name} not implemented"
+    end
+  end
+ 
+  (RealFileUtils.methods - Class.new.methods).each do |name|
+    define_method("test #{name} module method") do
+      assert FileUtils.respond_to?(name), "FileUtils.#{name} not implemented"
+    end
+  end
+end