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Fix ANSI escape codes for colored output not handled correctly with pytest.fail(..., pytrace=False) #12959

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@leonarduschen leonarduschen commented Nov 13, 2024

Closes #12849


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@leonarduschen leonarduschen marked this pull request as draft November 13, 2024 17:34
@psf-chronographer psf-chronographer bot added the bot:chronographer:provided (automation) changelog entry is part of PR label Nov 14, 2024
@leonarduschen leonarduschen changed the title Fix ExcInfo.value printed as source code Fix ANSI escape codes for colored output not handled correctly with pytest.fail(..., pytrace=False) Nov 14, 2024
@leonarduschen leonarduschen marked this pull request as ready for review November 14, 2024 16:32
@@ -119,8 +119,8 @@ def markup(self, text, **kw):
return text

def get_write_msg(self, idx):
flag, msg = self.lines[idx]
assert flag == TWMock.WRITE
assert self.lines[idx][0] == TWMock.WRITE
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Added this so that calling get_write_msg raises AssertionError instead of ValueError: Not enough values to unpack

I can revert it back if needed

@@ -1221,6 +1221,12 @@ def _write_entry_lines(self, tw: TerminalWriter) -> None:
if not self.lines:
return

if self.style == "value":
for line in self.lines:
tw.write(line)
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Using TerminalWriter.write instead of TerminalWriter.line because when using TWMock . we can't distinguish lines written with TWMock._write_source and lines written with line directly, whereas with TWMock.write we can, with the flag.

We could add a flag for TWMock._write_source as well, like so:

class TWMock:
    WRITE = object()
    WRITE_SOURCE = object()

    def _write_source(self, lines, indents=()):
        if not indents:
            indents = [""] * len(lines)
        for indent, line in zip(indents, lines):
            newline = indent + line
            self.line((TWMock.WRITE_SOURCE, newline))

But then we'll have to change around half the test cases in test_excinfo.py

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ANSI escape codes for colored output not handled correctly with pytest.fail(reason=..., pytrace=False)
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