tests, isisd: add IS-IS SPF unit tests

Now that the IS-IS SPF code is more modular, write some unit tests
for it.

This commit includes a new test program called "test_isis_spf" which
can load any test topology (there are 13 different ones available)
and run SPF on any desired node. In the future this same test program
and topologies will also be used to test reverse SPF and TI-LFA.

The "test_common.c" file contains helper functions used to parse the
topology descriptions from "test_topologies.c" into LSP databases
that can be used as an input to the SPF code.

This commit also introduces the F_ISIS_UNIT_TEST flag which is used
to prevent the IS-IS code from scheduling any event when running
under the context of an unit test.

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/isisd/isis_dynhn.h b/isisd/isis_dynhn.h
index 2cfc43fc17..973fde8307 100644
--- a/isisd/isis_dynhn.h
+++ b/isisd/isis_dynhn.h
@@ -31,6 +31,7 @@ struct isis_dynhn {
 };
 
 void dyn_cache_init(struct isis *isis);
+void dyn_cache_cleanup_all(void);
 void isis_dynhn_insert(const uint8_t *id, const char *hostname, int level);
 void isis_dynhn_remove(const uint8_t *id);
 struct isis_dynhn *dynhn_find_by_id(const uint8_t *id);