qutebrowser/tests/unit/commands/test_cmdutils.py

# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:

# Copyright 2015-2016 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
#
# This file is part of qutebrowser.
#
# qutebrowser 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.
#
# qutebrowser 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 qutebrowser.  If not, see <http://www.gnu.org/licenses/>.

# pylint: disable=unused-variable

"""Tests for qutebrowser.commands.cmdutils."""

import pytest

from qutebrowser.commands import cmdutils, cmdexc, argparser, command
from qutebrowser.utils import usertypes, typing


@pytest.fixture(autouse=True)
def clear_globals(monkeypatch):
    """Clear the cmdutils globals between each test."""
    monkeypatch.setattr(cmdutils, 'cmd_dict', {})
    monkeypatch.setattr(cmdutils, 'aliases', [])


def _get_cmd(*args, **kwargs):
    """Get a command object created via @cmdutils.register.

    Args:
        Passed to @cmdutils.register decorator
    """
    @cmdutils.register(*args, **kwargs)
    def fun():
        """Blah."""
        pass
    return cmdutils.cmd_dict['fun']


class TestCheckOverflow:

    def test_good(self):
        cmdutils.check_overflow(1, 'int')

    def test_bad(self):
        int32_max = 2 ** 31 - 1

        with pytest.raises(cmdexc.CommandError) as excinfo:
            cmdutils.check_overflow(int32_max + 1, 'int')

        expected_str = ("Numeric argument is too large for internal int "
                        "representation.")

        assert str(excinfo.value) == expected_str


class TestCheckExclusive:

    @pytest.mark.parametrize('flags', [[], [False, True], [False, False]])
    def test_good(self, flags):
        cmdutils.check_exclusive(flags, [])

    def test_bad(self):
        with pytest.raises(cmdexc.CommandError) as excinfo:
            cmdutils.check_exclusive([True, True], 'xyz')

        assert str(excinfo.value) == "Only one of -x/-y/-z can be given!"


class TestRegister:

    def test_simple(self):
        @cmdutils.register()
        def fun():
            """Blah."""
            pass

        cmd = cmdutils.cmd_dict['fun']
        assert cmd.handler is fun
        assert cmd.name == 'fun'
        assert len(cmdutils.cmd_dict) == 1
        assert not cmdutils.aliases

    def test_underlines(self):
        """Make sure the function name is normalized correctly (_ -> -)."""
        @cmdutils.register()
        def eggs_bacon():
            """Blah."""
            pass

        assert cmdutils.cmd_dict['eggs-bacon'].name == 'eggs-bacon'
        assert 'eggs_bacon' not in cmdutils.cmd_dict

    def test_lowercasing(self):
        """Make sure the function name is normalized correctly (uppercase)."""
        @cmdutils.register()
        def Test():  # pylint: disable=invalid-name
            """Blah."""
            pass

        assert cmdutils.cmd_dict['test'].name == 'test'
        assert 'Test' not in cmdutils.cmd_dict

    def test_explicit_name(self):
        """Test register with explicit name."""
        @cmdutils.register(name='foobar')
        def fun():
            """Blah."""
            pass

        assert cmdutils.cmd_dict['foobar'].name == 'foobar'
        assert 'fun' not in cmdutils.cmd_dict
        assert len(cmdutils.cmd_dict) == 1
        assert not cmdutils.aliases

    def test_multiple_names(self):
        """Test register with name being a list."""
        @cmdutils.register(name=['foobar', 'blub'])
        def fun():
            """Blah."""
            pass

        assert cmdutils.cmd_dict['foobar'].name == 'foobar'
        assert cmdutils.cmd_dict['blub'].name == 'foobar'
        assert 'fun' not in cmdutils.cmd_dict
        assert len(cmdutils.cmd_dict) == 2
        assert cmdutils.aliases == ['blub']

    def test_multiple_registrations(self):
        """Make sure registering the same name twice raises ValueError."""
        @cmdutils.register(name=['foobar', 'blub'])
        def fun():
            """Blah."""
            pass

        with pytest.raises(ValueError):
            @cmdutils.register(name=['blah', 'blub'])
            def fun2():
                """Blah."""
                pass

    def test_instance(self):
        """Make sure the instance gets passed to Command."""
        @cmdutils.register(instance='foobar')
        def fun(self):
            """Blah."""
            pass
        assert cmdutils.cmd_dict['fun']._instance == 'foobar'

    def test_kwargs(self):
        """Make sure the other keyword arguments get passed to Command."""
        @cmdutils.register(hide=True)
        def fun():
            """Blah."""
            pass
        assert cmdutils.cmd_dict['fun'].hide

    def test_star_args(self):
        """Check handling of *args."""
        @cmdutils.register()
        def fun(*args):
            """Blah."""
            pass
        with pytest.raises(argparser.ArgumentParserError):
            cmdutils.cmd_dict['fun'].parser.parse_args([])

    def test_star_args_optional(self):
        """Check handling of *args withstar_args_optional."""
        @cmdutils.register(star_args_optional=True)
        def fun(*args):
            """Blah."""
            pass
        cmdutils.cmd_dict['fun'].parser.parse_args([])

    def test_flag(self):
        @cmdutils.register()
        def fun(arg=False):
            """Blah."""
            pass
        parser = cmdutils.cmd_dict['fun'].parser
        assert parser.parse_args(['--arg']).arg
        assert parser.parse_args(['-a']).arg
        assert not parser.parse_args([]).arg

    def test_flag_argument(self):
        @cmdutils.register()
        @cmdutils.argument('arg', flag='b')
        def fun(arg=False):
            """Blah."""
            pass
        parser = cmdutils.cmd_dict['fun'].parser

        assert parser.parse_args(['-b']).arg
        with pytest.raises(argparser.ArgumentParserError):
            parser.parse_args(['-a'])

    def test_partial_arg(self):
        """Test with only some arguments decorated with @cmdutils.argument."""
        @cmdutils.register()
        @cmdutils.argument('arg1', flag='b')
        def fun(arg1=False, arg2=False):
            """Blah."""
            pass

    def test_win_id(self):
        @cmdutils.register()
        @cmdutils.argument('win_id', win_id=True)
        def fun(win_id):
            """Blah."""
            pass
        assert cmdutils.cmd_dict['fun']._get_call_args(42) == ([42], {})

    def test_count(self):
        @cmdutils.register()
        @cmdutils.argument('count', count=True)
        def fun(count=0):
            """Blah."""
            pass
        assert cmdutils.cmd_dict['fun']._get_call_args(42) == ([0], {})

    def test_count_without_default(self):
        with pytest.raises(TypeError) as excinfo:
            @cmdutils.register()
            @cmdutils.argument('count', count=True)
            def fun(count):
                """Blah."""
                pass

        expected = "fun: handler has count parameter without default!"
        assert str(excinfo.value) == expected

    @pytest.mark.parametrize('hide', [True, False])
    def test_pos_args(self, hide):
        @cmdutils.register()
        @cmdutils.argument('arg', hide=hide)
        def fun(arg):
            """Blah."""
            pass

        pos_args = cmdutils.cmd_dict['fun'].pos_args
        if hide:
            assert pos_args == []
        else:
            assert pos_args == [('arg', 'arg')]

    Enum = usertypes.enum('Test', ['x', 'y'])

    @pytest.mark.parametrize('typ, inp, choices, expected', [
        (int, '42', None, 42),
        (int, 'x', None, cmdexc.ArgumentTypeError),
        (str, 'foo', None, 'foo'),

        (typing.Union[str, int], 'foo', None, 'foo'),
        (typing.Union[str, int], '42', None, 42),

        # Choices
        (str, 'foo', ['foo'], 'foo'),
        (str, 'bar', ['foo'], cmdexc.ArgumentTypeError),

        # Choices with Union: only checked when it's a str
        (typing.Union[str, int], 'foo', ['foo'], 'foo'),
        (typing.Union[str, int], 'bar', ['foo'], cmdexc.ArgumentTypeError),
        (typing.Union[str, int], '42', ['foo'], 42),

        (Enum, 'x', None, Enum.x),
        (Enum, 'z', None, cmdexc.ArgumentTypeError),
    ])
    def test_typed_args(self, typ, inp, choices, expected):
        @cmdutils.register()
        @cmdutils.argument('arg', choices=choices)
        def fun(arg: typ):
            """Blah."""
            pass

        cmd = cmdutils.cmd_dict['fun']
        cmd.namespace = cmd.parser.parse_args([inp])

        if expected is cmdexc.ArgumentTypeError:
            with pytest.raises(cmdexc.ArgumentTypeError):
                cmd._get_call_args(win_id=0)
        else:
            assert cmd._get_call_args(win_id=0) == ([expected], {})

    def test_pos_arg_info(self):
        @cmdutils.register()
        @cmdutils.argument('foo', choices=('a', 'b'))
        @cmdutils.argument('bar', choices=('x', 'y'))
        @cmdutils.argument('opt')
        def fun(foo, bar, opt=False):
            """Blah."""
            pass

        cmd = cmdutils.cmd_dict['fun']
        assert cmd.get_pos_arg_info(0) == command.ArgInfo(choices=('a', 'b'))
        assert cmd.get_pos_arg_info(1) == command.ArgInfo(choices=('x', 'y'))
        with pytest.raises(IndexError):
            cmd.get_pos_arg_info(2)


class TestArgument:

    """Test the @cmdutils.argument decorator."""

    def test_invalid_argument(self):
        with pytest.raises(ValueError) as excinfo:
            @cmdutils.argument('foo')
            def fun(bar):
                """Blah."""
                pass
        assert str(excinfo.value) == "fun has no argument foo!"

    def test_storage(self):
        @cmdutils.argument('foo', flag='x')
        @cmdutils.argument('bar', flag='y')
        def fun(foo, bar):
            """Blah."""
            pass
        expected = {
            'foo': command.ArgInfo(flag='x'),
            'bar': command.ArgInfo(flag='y')
        }
        assert fun.qute_args == expected

    def test_wrong_order(self):
        """When @cmdutils.argument is used above (after) @register, fail."""
        with pytest.raises(ValueError) as excinfo:
            @cmdutils.argument('bar', flag='y')
            @cmdutils.register()
            def fun(bar):
                """Blah."""
                pass

        text = ("@cmdutils.argument got called above (after) "
                "@cmdutils.register for fun!")

        assert str(excinfo.value) == text

    def test_count_and_win_id_same_arg(self):
        with pytest.raises(TypeError) as excinfo:
            @cmdutils.argument('arg', count=True, win_id=True)
            def fun(arg=0):
                """Blah."""
                pass

        assert str(excinfo.value) == "Argument marked as both count/win_id!"


class TestRun:

    @pytest.fixture(autouse=True)
    def patching(self, mode_manager, fake_args):
        fake_args.backend = 'webkit'

    @pytest.mark.parametrize('backend, used, ok', [
        (usertypes.Backend.QtWebEngine, 'webengine', True),
        (usertypes.Backend.QtWebEngine, 'webkit', False),
        (usertypes.Backend.QtWebKit, 'webengine', False),
        (usertypes.Backend.QtWebKit, 'webkit', True),
        (None, 'webengine', True),
        (None, 'webkit', True),
    ])
    def test_backend(self, fake_args, backend, used, ok):
        fake_args.backend = used
        cmd = _get_cmd(backend=backend)
        if ok:
            cmd.run(win_id=0)
        else:
            with pytest.raises(cmdexc.PrerequisitesError) as excinfo:
                cmd.run(win_id=0)
            assert str(excinfo.value).endswith(' backend.')

    def test_no_args(self):
        cmd = _get_cmd()
        cmd.run(win_id=0)

    def test_instance_unavailable_with_backend(self, fake_args):
        """Test what happens when a backend doesn't have an objreg object.

        For example, QtWebEngine doesn't have 'hintmanager' registered. We make
        sure the backend checking happens before resolving the instance, so we
        display an error instead of crashing.
        """
        @cmdutils.register(instance='doesnotexist',
                           backend=usertypes.Backend.QtWebEngine)
        def fun(self):
            """Blah."""
            pass

        fake_args.backend = 'webkit'
        cmd = cmdutils.cmd_dict['fun']
        with pytest.raises(cmdexc.PrerequisitesError) as excinfo:
            cmd.run(win_id=0)
        assert str(excinfo.value).endswith(' backend.')