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# THIS FILE IS PART OF THE CYLC WORKFLOW ENGINE.
# Copyright (C) NIWA & British Crown (Met Office) & Contributors.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import pytest
from cylc.flow.option_parsers import Options
from cylc.flow.scripts.graph import _main, get_option_parser
Opts = Options(get_option_parser())
@pytest.fixture
def disable_graph_open(monkeypatch):
"""Prevent "cylc graph" from trying to pop open the image."""
monkeypatch.setattr(
'cylc.flow.scripts.graph.open_image',
lambda *_a, **_k: None,
)
async def test_blank_graph(one, disable_graph_open, capsys):
"""It should inform the user if there are no tasks to display."""
# graph with one task
await _main(Opts(color='never'), one.tokens.id)
out, err = capsys.readouterr()
assert 'Graph rendered to' in out
# graph with no tasks (the only task is in cycle "1")
await _main(Opts(color='never'), one.tokens.id, '5')
out, err = capsys.readouterr()
assert 'No tasks to display' in err
assert 'Try changing the start and stop values' in err
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