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from IPython.utils.capture import capture_output
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import nose.tools as nt
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def test_alias_lifecycle():
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name = 'test_alias1'
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cmd = 'echo "Hello"'
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am = _ip.alias_manager
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am.clear_aliases()
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am.define_alias(name, cmd)
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assert am.is_alias(name)
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nt.assert_equal(am.retrieve_alias(name), cmd)
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nt.assert_in((name, cmd), am.aliases)
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# Test running the alias
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orig_system = _ip.system
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result = []
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_ip.system = result.append
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try:
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_ip.run_cell('%{}'.format(name))
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result = [c.strip() for c in result]
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nt.assert_equal(result, [cmd])
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finally:
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_ip.system = orig_system
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# Test removing the alias
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am.undefine_alias(name)
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assert not am.is_alias(name)
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with nt.assert_raises(ValueError):
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am.retrieve_alias(name)
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nt.assert_not_in((name, cmd), am.aliases)
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def test_alias_args_error():
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"""Error expanding with wrong number of arguments"""
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_ip.alias_manager.define_alias('parts', 'echo first %s second %s')
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# capture stderr:
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with capture_output() as cap:
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_ip.run_cell('parts 1')
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nt.assert_equal(cap.stderr.split(':')[0], 'UsageError')
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def test_alias_args_commented():
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"""Check that alias correctly ignores 'commented out' args"""
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_ip.magic('alias commetarg echo this is %%s a commented out arg')
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with capture_output() as cap:
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_ip.run_cell('commetarg')
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nt.assert_equal(cap.stdout, 'this is %s a commented out arg')
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def test_alias_args_commented_nargs():
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"""Check that alias correctly counts args, excluding those commented out"""
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am = _ip.alias_manager
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alias_name = 'comargcount'
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cmd = 'echo this is %%s a commented out arg and this is not %s'
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am.define_alias(alias_name, cmd)
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assert am.is_alias(alias_name)
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thealias = am.get_alias(alias_name)
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nt.assert_equal(thealias.nargs, 1)
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