test: Add a test for log filter-*

This exercises a few success and failure modes of the log filter-*
commands. log filter-list is not tested because it's purely informational.
I don't think there's a good way to test it except by testing if the output
of the command exactly matches a sample run.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/test/log.h b/include/test/log.h
index 772e197..e902891 100644
--- a/include/test/log.h
+++ b/include/test/log.h
@@ -14,5 +14,6 @@
 
 /* Declare a new logging test */
 #define LOG_TEST(_name) UNIT_TEST(_name, 0, log_test)
+#define LOG_TEST_FLAGS(_name, _flags) UNIT_TEST(_name, _flags, log_test)
 
 #endif /* __TEST_LOG_H__ */