ensure first_log and last_log match when appending to empty log

test/append-test-log.c

@@ -57,6 +57,15 @@ append_to_empty(TestState *s)
 		test.first_log,
 		0
 	);
+
+	// last_log should match first_log
+	print("\t\tlast_log\n");
+	chk_ptr_eq(
+		s,
+		"ERROR: append_test_log(): append to empty: last_log:",
+		test.last_log,
+		test.first_log
+	);
 }
 
 //jl