nucypher/tests/cli/test_main.py

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from click.testing import CliRunner
from cli.main import cli
def test_help_message():
runner = CliRunner()
result = runner.invoke(cli, ['--help'], catch_exceptions=False)
assert result.exit_code == 0
assert 'Usage: cli [OPTIONS] COMMAND [ARGS]' in result.output, 'Missing or invalid help text was produced.'