From 4021770688c3781355766af4fc501e8378b0c6d7 Mon Sep 17 00:00:00 2001
From: Daniel Hahler <git@thequod.de>
Date: Wed, 19 Feb 2020 13:16:57 +0100
Subject: [PATCH] pytester: LineMatcher: use `_fail` with `_match_lines_random`
 (#6747)

---
 src/_pytest/pytester.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/_pytest/pytester.py b/src/_pytest/pytester.py
index b69bfd5bc..3c87387eb 100644
--- a/src/_pytest/pytester.py
+++ b/src/_pytest/pytester.py
@@ -1354,8 +1354,9 @@ class LineMatcher:
                     self._log("matched: ", repr(line))
                     break
             else:
-                self._log("line %r not found in output" % line)
-                raise ValueError(self._log_text)
+                msg = "line %r not found in output" % line
+                self._log(msg)
+                self._fail(msg)
 
     def get_lines_after(self, fnline: str) -> Sequence[str]:
         """Return all lines following the given line in the text.