A little more documentation.

Author: Tom Manner

README.md

@@ -12,9 +12,11 @@ To build a single `.so` library file for `cppdigraph`:
     make
 
 ### As a Developer
-To produce the entire 
+To build the library and test environment for `cppdigraph`:
 
     mkdir build
     cd build
     cmake ..
     make
+
+Once the test environment is compiled, you can run them with `ctest`.  Tests are registered in `test/CMakeLists.txt` using the `add_test` directive.  To see the stdout of the tests as they run, use `ctest -V`.