Small documentation updates

README.md

@@ -11,8 +11,11 @@ There's an example of a "fake login" program in the examples directory.
 Look at the pam module's [godocs][1] for details about the Go API, or refer
 to the official [PAM documentation][2].
 
-The test suite must be run as the root user. To setup your system for testing,
-create a user named "test" with the password "secret". For example:
+## Testing
+
+To run the full suite, the tests must be run as the root user. To setup your
+system for testing, create a user named "test" with the password "secret". For
+example:
 
 ```
 $ sudo useradd test \
@@ -21,5 +24,11 @@ $ sudo useradd test \
     -s /bin/false
 ```
 
+Then execute the tests:
+
+```
+$ sudo GOPATH=$GOPATH $(which go) test -v
+```
+
 [1]: http://godoc.org/github.com/msteinert/pam
 [2]: http://www.kernel.org/pub/linux/libs/pam/Linux-PAM-html/adg-interface-by-app-expected.html