--- /dev/null
+Most of the tests follow the same pattern.
+
+ * test.pl that uses Test::More, and demonstrates whatever functionality
+ that we're trying to test. This is the reference code.
+
+ * test.c, which tests the libtap reimplementation of the same functionality.
+
+ * test.t, which compiles the .c program, runs both test scripts, and then
+ diffs their output to make sure it's identical.