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[WIP] Avoid truncation when longer output, ref. #6267 #6462

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[WIP] Avoid truncation when longer output, ref. #6267 #6462

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a79cfe9
Initial proposal to #6267, change truncation message
erheron Jan 12, 2020
937e0e2
Add changelog entry
erheron Jan 15, 2020
8b521ba
Update src/_pytest/assertion/truncate.py
erheron Feb 19, 2020
b62aad0
Add missing space
erheron Feb 19, 2020
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2 changes: 2 additions & 0 deletions changelog/6267.feature.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
When output is close to truncation limit, we now write 'N lines hidden [1 truncated]',
instead of 'N+1 lines hidden' - last line which we show isn't really hidden always, neither it's always really truncated.
14 changes: 11 additions & 3 deletions src/_pytest/assertion/truncate.py
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Expand Up @@ -40,6 +40,8 @@ def _truncate_explanation(input_lines, max_lines=None, max_chars=None):

Truncates to either 8 lines, or 640 characters - whichever the input reaches
first. The remaining lines will be replaced by a usage message.

Check https://github.com/pytest-dev/pytest/issues/6267 for corner cases
"""

if max_lines is None:
Expand All @@ -62,12 +64,18 @@ def _truncate_explanation(input_lines, max_lines=None, max_chars=None):

# Append useful message to explanation
truncated_line_count = len(input_lines) - len(truncated_explanation)
truncated_line_count += 1 # Account for the part-truncated final line
msg = "...Full output truncated"
last_truncated = not (
input_lines[len(truncated_explanation) - 1] in truncated_explanation[-1]
)
if truncated_line_count == 1:
msg += " ({} line hidden)".format(truncated_line_count)
msg += " ({} line hidden".format(truncated_line_count)
else:
msg += " ({} lines hidden".format(truncated_line_count)
if last_truncated:
msg += ", 1 truncated)"
else:
msg += " ({} lines hidden)".format(truncated_line_count)
msg += ")"
msg += ", {}".format(USAGE_MSG)
truncated_explanation.extend(["", str(msg)])
return truncated_explanation
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