From 3dc0583b433b5e984df6da4443de57722d0e1bf4 Mon Sep 17 00:00:00 2001
From: robot-piglet <robot-piglet@yandex-team.com>
Date: Fri, 8 May 2026 11:44:05 +0300
Subject: Intermediate changes
 commit_hash:9b6bd8ea4bc3ae7df2576daf77c181b20f7cd869

---
 library/python/pytest/plugins/ya.py | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

(limited to 'library/python')

diff --git a/library/python/pytest/plugins/ya.py b/library/python/pytest/plugins/ya.py
index bc29dd96305..a42a942c39f 100644
--- a/library/python/pytest/plugins/ya.py
+++ b/library/python/pytest/plugins/ya.py
@@ -57,6 +57,8 @@ import yatest_lib.ya
 
 from library.python.pytest import context
 
+DEFAULT_COMMENT_LIMIT = 8 * 1024  # 8 Kb
+
 console_logger = logging.getLogger("console")
 yatest_logger = logging.getLogger("ya.test")
 
@@ -195,6 +197,16 @@ def pytest_addoption(parser):
     parser.addoption("--pdb-on-sigusr1", action="store_true", default=False, help="setup pdb.set_trace on SIGUSR1")
     parser.addoption("--test-tool-bin", help="Path to test_tool")
     parser.addoption("--test-list-path", dest="test_list_path", action="store", help="path to test list", default="")
+    parser.addoption(
+        "--max-test-comment-size",
+        action="store",
+        dest="max_test_comment_size",
+        type=int,
+        default=DEFAULT_COMMENT_LIMIT,
+        help="Max length (in bytes) of a test result comment (assertion/diagnostic message) "
+             "written to the trace file. 0 (or any non-positive value) disables truncation. "
+             "Default is 8*1024 (8 Kb)",
+    )
 
 
 def from_ya_test():
@@ -935,7 +947,7 @@ class TraceReportGenerator(object):
             message = self._test_messages[test_item.nodeid]
         else:
             comment = self._test_messages[test_item.nodeid]['comment'] if test_item.nodeid in self._test_messages else ''
-            comment += self._get_comment(test_item)
+            comment += self._get_comment(test_item, pytest_config.option.max_test_comment_size)
             message = {
                 'class': yatest_lib.tools.to_utf8(test_item.class_name),
                 'subtest': yatest_lib.tools.to_utf8(test_item.test_name),
@@ -962,7 +974,7 @@ class TraceReportGenerator(object):
         self.trace("chunk_event", message)
 
     def on_error(self, test_item):
-        self.trace('chunk_event', {"errors": [(test_item.status, self._get_comment(test_item))]})
+        self.trace('chunk_event', {"errors": [(test_item.status, self._get_comment(test_item, pytest_config.option.max_test_comment_size))]})
 
     def on_log_report(self, test_item):
         if test_item.nodeid in self._test_duration:
@@ -971,7 +983,7 @@ class TraceReportGenerator(object):
             self._test_duration[test_item.nodeid] = test_item._duration
 
     @staticmethod
-    def _get_comment(test_item, limit=8*1024):
+    def _get_comment(test_item, limit=DEFAULT_COMMENT_LIMIT):
         msg = yatest_lib.tools.to_utf8(test_item.error)
         if not msg:
             return ""
-- 
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