from IPython.utils.capture import capture_output import nose.tools as nt def test_alias_lifecycle(): name = 'test_alias1' cmd = 'echo "Hello"' am = _ip.alias_manager am.clear_aliases() am.define_alias(name, cmd) assert am.is_alias(name) nt.assert_equal(am.retrieve_alias(name), cmd) nt.assert_in((name, cmd), am.aliases) # Test running the alias orig_system = _ip.system result = [] _ip.system = result.append try: _ip.run_cell('%{}'.format(name)) result = [c.strip() for c in result] nt.assert_equal(result, [cmd]) finally: _ip.system = orig_system # Test removing the alias am.undefine_alias(name) assert not am.is_alias(name) with nt.assert_raises(ValueError): am.retrieve_alias(name) nt.assert_not_in((name, cmd), am.aliases) def test_alias_args_error(): """Error expanding with wrong number of arguments""" _ip.alias_manager.define_alias('parts', 'echo first %s second %s') # capture stderr: with capture_output() as cap: _ip.run_cell('parts 1') nt.assert_equal(cap.stderr.split(':')[0], 'UsageError')