feat(logfiles): add function for checking expected messages

Refactored the `expect_errors` function by extracting the log message
checking logic into a separate `_check_msgs_presence_in_logs` function.
Added a new `expect_messages` context manager for checking expected
messages in logs. This improves code readability and reusability.

cardano_node_tests/utils/logfiles.py

@@ -270,33 +270,13 @@ def add_ignore_rule(
         infile.write(f"{files_glob};;{skip_after};;{regex}\n")
 
 
-@contextlib.contextmanager
-def expect_errors(regex_pairs: tp.List[tp.Tuple[str, str]], worker_id: str) -> tp.Iterator[None]:
-    """Make sure the expected errors are present in logs.
-
-    Args:
-        regex_pairs: [(glob, regex)] - A list of regexes that need to be present in files
-            described by the glob.
-        worker_id: The id of the pytest-xdist worker (the `worker_id` fixture) that the test
-            is running on.
-    """
-    state_dir = cluster_nodes.get_cluster_env().state_dir
-
-    glob_list = []
-    for files_glob, regex in regex_pairs:
-        add_ignore_rule(files_glob=files_glob, regex=regex, ignore_file_id=worker_id)
-        glob_list.append(files_glob)
-    # Resolve the globs
-    _expanded_paths = [list(state_dir.glob(glob_item)) for glob_item in glob_list]
-    # Flatten the list
-    expanded_paths = list(itertools.chain.from_iterable(_expanded_paths))
-    # Record each end-of-file as a starting offset for searching the log file
-    seek_offsets = {str(p): helpers.get_eof_offset(p) for p in expanded_paths}
-
-    timestamp = time.time()
-
-    yield
-
+def _check_msgs_presence_in_logs(
+    regex_pairs: tp.List[tp.Tuple[str, str]],
+    seek_offsets: tp.Dict[str, int],
+    state_dir: pl.Path,
+    timestamp: float,
+) -> None:
+    """Make sure the expected messages are present in logs."""
     errors = []
     for files_glob, regex in regex_pairs:
         regex_comp = re.compile(regex)
@@ -307,7 +287,7 @@ def expect_errors(regex_pairs: tp.List[tp.Tuple[str, str]], worker_id: str) -> t
             if ROTATED_RE.match(logfile):
                 continue
 
-            # Search for the expected error
+            # Search for the expected string
             seek = seek_offsets.get(logfile) or 0
             line_found = False
             for logfile_rec in _get_rotated_logs(
@@ -329,6 +309,69 @@ def expect_errors(regex_pairs: tp.List[tp.Tuple[str, str]], worker_id: str) -> t
         raise AssertionError(errors_joined) from None
 
 
+@contextlib.contextmanager
+def expect_errors(regex_pairs: tp.List[tp.Tuple[str, str]], worker_id: str) -> tp.Iterator[None]:
+    """Make sure the expected errors are present in logs.
+
+    Context manager.
+
+    Args:
+        regex_pairs: [(glob, regex)] - A list of regexes that need to be present in files
+            described by the glob.
+        worker_id: The id of the pytest-xdist worker (the `worker_id` fixture) that the test
+            is running on.
+    """
+    state_dir = cluster_nodes.get_cluster_env().state_dir
+
+    glob_list = []
+    for files_glob, regex in regex_pairs:
+        add_ignore_rule(files_glob=files_glob, regex=regex, ignore_file_id=worker_id)
+        glob_list.append(files_glob)
+    # Resolve the globs
+    _expanded_paths = [list(state_dir.glob(glob_item)) for glob_item in glob_list]
+    # Flatten the list
+    expanded_paths = list(itertools.chain.from_iterable(_expanded_paths))
+    # Record each end-of-file as a starting offset for searching the log file
+    seek_offsets = {str(p): helpers.get_eof_offset(p) for p in expanded_paths}
+
+    timestamp = time.time()
+
+    yield
+
+    _check_msgs_presence_in_logs(
+        regex_pairs=regex_pairs, seek_offsets=seek_offsets, state_dir=state_dir, timestamp=timestamp
+    )
+
+
+@contextlib.contextmanager
+def expect_messages(regex_pairs: tp.List[tp.Tuple[str, str]]) -> tp.Iterator[None]:
+    """Make sure the expected messages are present in logs.
+
+    Context manager.
+
+    Args:
+        regex_pairs: [(glob, regex)] - A list of regexes that need to be present in files
+            described by the glob.
+    """
+    state_dir = cluster_nodes.get_cluster_env().state_dir
+
+    glob_list = [r[0] for r in regex_pairs]
+    # Resolve the globs
+    _expanded_paths = [list(state_dir.glob(glob_item)) for glob_item in glob_list]
+    # Flatten the list
+    expanded_paths = list(itertools.chain.from_iterable(_expanded_paths))
+    # Record each end-of-file as a starting offset for searching the log file
+    seek_offsets = {str(p): helpers.get_eof_offset(p) for p in expanded_paths}
+
+    timestamp = time.time()
+
+    yield
+
+    _check_msgs_presence_in_logs(
+        regex_pairs=regex_pairs, seek_offsets=seek_offsets, state_dir=state_dir, timestamp=timestamp
+    )
+
+
 def search_cluster_logs() -> tp.List[tp.Tuple[pl.Path, str]]:
     """Search cluster logs for errors."""
     cluster_env = cluster_nodes.get_cluster_env()