test skipping idea

TODO

@@ -1,6 +1,18 @@
 Things I want
 =============
 
+Skip tests
+-------------
+I want tests to be able to decide to skip themselves. For example, if a test
+requires some dependancy, it might look for the dependency and then skip if it
+does not see the dependency. It might look like this.
+
+    #!/bin/sh
+    if which parallel > /dev/null; then
+      exit 3 # status code 3 for skip
+    fi
+    parallel blah blah ...
+
 Test speed
 -------------
 Make tests run faster.