def test_call(self, mock_select, mock_popen, mock_which):
mock_which.return_value = 'command'
mock_select.return_value = [True, False, False]
mock_process = Mock()
mock_popen.return_value = mock_process
call = Command.call(['command', 'args'])
assert call.output_available()
assert call.error_available()
assert call.output == mock_process.stdout
assert call.error == mock_process.stderr
assert call.process == mock_process
def test_call_command_does_not_exist(self):
with raises(DistMigrationCommandNotFoundException):
Command.call(['does-not-exist'], os.environ)
def test_call_failure(self, mock_popen, mock_which):
mock_which.return_value = 'command'
mock_popen.side_effect = DistMigrationCommandException('Call failure')
with raises(DistMigrationCommandException):
Command.call(['command', 'args'])