Netlab: New BFD testing functions added

netlab/tests/get_stdout_bfd

+#!/bin/sh
+. tests/strip_output
+
+cd $1 && ./birdc -l show bfd sessions $2 \
+    | strip_version \
+    | strip_timestamp \
+    | tail +4 \
+    | sort

netlab/tests/kernel.py

@@ -118,3 +118,33 @@ def check_expected_logs(log_messages: List[str], logfile: str) -> bool:
         if os.system(f"egrep '{message}' {logfile}"):
             return False
     return True
+
+
+def test_bfd_sessions(**kwargs) -> None:
+    if cf.save:
+        save_bfd_sessions(kwargs["key"], kwargs["dev"], kwargs["opts"])
+    else:
+        check_bfd_sessions(kwargs["key"], kwargs["dev"], kwargs["opts"])
+
+
+def save_bfd_sessions(key: str, dev: str, opts: str,
+                      loc: str = cf.datadir) -> None:
+    os.system(f"./tests/get_stdout_bfd '{dev}' '{opts}' > {loc}/{key}-{dev}")
+
+
+def timeout_decorator(func):
+    def inner(key, dev, opts):
+        for _ in range(61):
+            if func(key, dev, opts):
+                return
+            time.sleep(1)
+        assert 0
+    return inner
+
+
+@timeout_decorator
+def check_bfd_sessions(key, dev, opts) -> bool:
+    save_bfd_sessions(key, dev, opts, cf.tempdir)
+    current_table = read_file(f"{cf.tempdir}/{key}-{dev}")
+    saved_table = read_file(f"{cf.datadir}/{key}-{dev}")
+    return current_table == saved_table