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"""Tests for the caller-source-location capture helpers in :mod:`edify.errors.context`."""
import linecache
from unittest import mock
from edify.errors.context import CallerContext, capture_caller_context
def test_capture_caller_context_returns_none_when_every_frame_is_inside_edify():
with mock.patch("edify.errors.context.sys._getframe", return_value=None):
assert capture_caller_context() is None
def test_caller_context_dataclass_is_frozen_and_holds_position_fields():
context = CallerContext(filename="a.py", lineno=1, colno=1, end_colno=5)
assert context.filename == "a.py"
assert context.lineno == 1
assert context.colno == 1
assert context.end_colno == 5
def test_caller_context_source_line_property_reads_lazily_via_linecache():
filename = "/tmp/lazy_source_test.py"
linecache.cache[filename] = (5, None, ["x = 1\n"], filename)
context = CallerContext(filename=filename, lineno=1, colno=1, end_colno=5)
assert context.source_line == "x = 1"
def test_caller_context_source_line_returns_empty_string_when_line_is_unreadable():
context = CallerContext(filename="/tmp/no_such_file.py", lineno=999, colno=1, end_colno=1)
assert context.source_line == ""
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