+
+Contributing new tests(details)
+===============================
+
+ * Use TEST_GEN_XXX if such binaries or files are generated during
+ compiling.
+ TEST_PROGS, TEST_GEN_PROGS mean it is the excutable tested by
+ default.
+ TEST_PROGS_EXTENDED, TEST_GEN_PROGS_EXTENDED mean it is the
+ executable which is not tested by default.
+ TEST_FILES, TEST_GEN_FILES mean it is the file which is used by
+ test.