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from unittest.mock import patch
import pytest
from memray.commands import main
@patch("memray.commands.attach.debugger_available")
class TestAttachSubCommand:
def test_memray_attach_aggregated_without_output_file(
self, is_debugger_available_mock, capsys
):
# GIVEN
is_debugger_available_mock.return_value = True
# WHEN
with pytest.raises(SystemExit):
main(["attach", "--aggregate", "1234"])
captured = capsys.readouterr()
print("Error", captured.err)
assert "Can't use aggregated mode without an output file." in captured.err
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