log/test: Extend test case for log_check_level

This commit adds OSMO_ASSERTs for mandatory conditions related to
log_check_level, and fprintfs for optional conditions, since it is
always safe for log_check_level to return != 0.

Sponsored-by: On-Waves ehf
diff --git a/tests/logging/logging_test.c b/tests/logging/logging_test.c
index b263f90..3c8bac4 100644
--- a/tests/logging/logging_test.c
+++ b/tests/logging/logging_test.c
@@ -78,16 +78,26 @@
 	log_parse_category_mask(stderr_target, "DRLL:DCC");
 	log_parse_category_mask(stderr_target, "DRLL");
 	DEBUGP(DCC, "You should not see this\n");
+	if (log_check_level(DMM, LOGL_DEBUG) != 0)
+		fprintf(stderr, "log_check_level did not catch this case\n");
 
 	log_parse_category_mask(stderr_target, "DRLL:DCC");
 	DEBUGP(DRLL, "You should see this\n");
+	OSMO_ASSERT(log_check_level(DRLL, LOGL_DEBUG) != 0);
 	DEBUGP(DCC, "You should see this\n");
+	OSMO_ASSERT(log_check_level(DCC, LOGL_DEBUG) != 0);
 	DEBUGP(DMM, "You should not see this\n");
+	if (log_check_level(DMM, LOGL_DEBUG) != 0)
+		fprintf(stderr, "log_check_level did not catch this case\n");
+
 	OSMO_ASSERT(filter_called == 0);
 
 	log_set_all_filter(stderr_target, 0);
 	DEBUGP(DRLL, "You should not see this and filter is called\n");
 	OSMO_ASSERT(filter_called == 1);
+	if (log_check_level(DRLL, LOGL_DEBUG) != 0)
+		fprintf(stderr,
+			"log_check_level did not catch this case (filter)\n");
 
 	return 0;
 }