fix rounding problem in EchoDeadline test
diff --git a/test/cpp/end2end/end2end_test.cc b/test/cpp/end2end/end2end_test.cc
index 2edd108..578f26e 100644
--- a/test/cpp/end2end/end2end_test.cc
+++ b/test/cpp/end2end/end2end_test.cc
@@ -1333,8 +1333,11 @@
EXPECT_TRUE(s.ok());
gpr_timespec sent_deadline;
Timepoint2Timespec(deadline, &sent_deadline);
- // Allow 1 second error.
- EXPECT_LE(response.param().request_deadline() - sent_deadline.tv_sec, 1);
+ // We want to allow some reasonable error given:
+ // - request_deadline() only has 1sec resolution so the best we can do is +-1
+ // - if sent_deadline.tv_nsec is very close to the next second's boundary we
+ // can end up being off by 2 in one direction.
+ EXPECT_LE(response.param().request_deadline() - sent_deadline.tv_sec, 2);
EXPECT_GE(response.param().request_deadline() - sent_deadline.tv_sec, -1);
}