Ensure wait_for_line() is not called with timeout=0

diff --git a/bin/tests/system/isctest/log.py b/bin/tests/system/isctest/log.py
index 38c11438217046d12c501d46374097e5924c3e18..8a382626c0baa3ed6d0222032f901a52f430b0c3 100644 (file)
--- a/bin/tests/system/isctest/log.py
+++ b/bin/tests/system/isctest/log.py
@@ -227,6 +227,7 @@ class WatchLog(abc.ABC):
         if not self._fd:
             raise WatchLogException("No file to watch")
         leftover = ""
+        assert timeout, "Do not use this class unless you want to WAIT for something."
         deadline = time.time() + timeout
         while time.time() < deadline:
             for line in self._fd.readlines():