test(fuzzing): include full parameter list in fuzzer log output #1760

Original file line number	Diff line number	Diff line change
Expand Up		@@ -14,15 +14,14 @@
		# limitations under the License.
		#
		################################################################################
	import base64
		import contextlib
		import sys

		import atheris

		with atheris.instrument_imports():
		import icalendar.cal.calendar
	from icalendar.tests.fuzzed import fuzz_v1_calendar
	from icalendar.tests.fuzzed import format_fuzz_log, fuzz_v1_calendar


		@atheris.instrument_func
Expand All		@@ -36,8 +35,11 @@ def TestOneInput(data):
		# print the ICS file for the test case extraction
		# see https://stackoverflow.com/a/27367173/1320237
Comment on lines 35 to 36 @angatha angatha Sep 3, 2026 Copy link Copy Markdown Collaborator Choose a reason for hiding this comment The reason will be displayed to describe this comment to others. Learn more. Please keep this close to the `.encode("UTF-8", "surrogateescape")`part.
		print(
	base64.b64encode(calendar_string.encode("UTF-8", "surrogateescape")).decode(
	"ASCII"
	format_fuzz_log(
	icalendar.cal.calendar.Calendar.from_ical,
	multiple,
	should_walk,
	calendar_string,
Comment on lines 37 to +42 @angatha angatha Sep 4, 2026 Copy link Copy Markdown Collaborator Choose a reason for hiding this comment The reason will be displayed to describe this comment to others. Learn more. On a second thought, this should be called from `fuzz_v1_calendar` in `__init__.py` and include the version (see other comment).
		)
		)

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20 changes: 20 additions & 0 deletions src/icalendar/tests/fuzzed/__init__.py

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Original file line number	Diff line number	Diff line change
Expand Up		@@ -39,6 +39,26 @@
		]


	def format_fuzz_log(
	from_ical, multiple: bool, should_walk: bool, calendar_string: str
	) -> str:
	"""Format the log entry for fuzzed test case extraction.

	Outputs entrypoint name, parameter values, and base64-encoded calendar content.
	"""
	import base64

	encoded = base64.b64encode(
	calendar_string.encode("UTF-8", "surrogateescape")
	if isinstance(calendar_string, str)
	else calendar_string
	).decode("ASCII")
	return (
	f"{from_ical.__qualname__} multiple={multiple} "
	f"should_walk={should_walk} {encoded}"
Comment on lines +57 to +58 @angatha angatha Sep 4, 2026 Copy link Copy Markdown Collaborator Choose a reason for hiding this comment The reason will be displayed to describe this comment to others. Learn more. Suggested change f"{from_ical.__qualname__} multiple={multiple} " f"should_walk={should_walk} {encoded}" f"{version}{from_ical.__qualname__} multiple={multiple} " f"should_walk={should_walk} {encoded}"
	)


		def fuzz_v1_calendar(
		from_ical, calendar_string: str, multiple: bool, should_walk: bool
		):
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17 changes: 17 additions & 0 deletions src/icalendar/tests/fuzzed/test_fuzzed_calendars.py

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Original file line number	Diff line number	Diff line change
Expand Up		@@ -27,3 +27,20 @@ def test_fuzz_v1(fuzz_v1_calendar_path):
		multiple=True,
		should_walk=True,
		)


	def test_format_fuzz_log():
	import base64

	from icalendar.tests.fuzzed import format_fuzz_log

	content = "BEGIN:VCALENDAR\r\nEND:VCALENDAR"
	log = format_fuzz_log(
	icalendar.cal.calendar.Calendar.from_ical,
	multiple=False,
	should_walk=True,
	calendar_string=content,
	)
	assert log.startswith("Calendar.from_ical multiple=False should_walk=True ")
	encoded = log.split()[-1]
	assert base64.b64decode(encoded).decode("utf-8") == content

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