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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.
This commit is contained in:
Petr Viktorin 2021-01-06 13:33:33 +01:00
parent 31ae4e1764
commit 78fb97105f
1 changed files with 3 additions and 3 deletions
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6
src/_pytest/_code/code.py
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@ -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())