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From 78fb97105f38dc286353bbc331a243b6e753fe3c Mon Sep 17 00:00:00 2001
From: Petr Viktorin <encukou@gmail.com>
Date: Wed, 6 Jan 2021 13:33:33 +0100
Subject: [PATCH] Make code.FormattedExcinfo.get_source more defensive
When line_index was a large negative number, get_source failed
on `source.lines[line_index]`.
Use the same dummy Source as with a large positive line_index.
---
src/_pytest/_code/code.py | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/_pytest/_code/code.py b/src/_pytest/_code/code.py
index b85217560..af3bdf056 100644
--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -721,11 +721,11 @@ class FormattedExcinfo:
) -> List[str]:
"""Return formatted and marked up source lines."""
lines = []
- if source is None or line_index >= len(source.lines):
+ if source is not None and line_index < 0:
+ line_index += len(source.lines)
+ if source is None or line_index >= len(source.lines) or line_index < 0:
source = Source("???")
line_index = 0
- if line_index < 0:
- line_index += len(source)
space_prefix = " "
if short:
lines.append(space_prefix + source.lines[line_index].strip())
--
2.31.1
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