mwparserfromhell/tests/test_tokens.py

#
# Copyright (C) 2012-2016 Ben Kurtovic <ben.kurtovic@gmail.com>
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import pytest

from mwparserfromhell.parser import tokens

class TestTokens:
    """Test cases for the Token class and its subclasses."""

    @pytest.mark.parametrize("name", tokens.__all__)
    def test_issubclass(self, name):
        """check that all classes within the tokens module are really Tokens"""
        klass = getattr(tokens, name)
        assert issubclass(klass, tokens.Token) is True
        assert isinstance(klass(), klass)
        assert isinstance(klass(), tokens.Token)

    def test_attributes(self):
        """check that Token attributes can be managed properly"""
        token1 = tokens.Token()
        token2 = tokens.Token(foo="bar", baz=123)

        assert "bar" == token2.foo
        assert 123 == token2.baz
        assert token1.foo is None
        assert token2.bar is None

        token1.spam = "eggs"
        token2.foo = "ham"
        del token2.baz

        assert "eggs" == token1.spam
        assert "ham" == token2.foo
        assert token2.baz is None
        with pytest.raises(KeyError):
            token2.__delattr__("baz")

    def test_repr(self):
        """check that repr() on a Token works as expected"""
        token1 = tokens.Token()
        token2 = tokens.Token(foo="bar", baz=123)
        token3 = tokens.Text(text="earwig" * 100)
        hundredchars = ("earwig" * 100)[:97] + "..."

        assert "Token()" == repr(token1)
        token2repr1 = "Token(foo='bar', baz=123)"
        token2repr2 = "Token(baz=123, foo='bar')"
        token3repr = "Text(text='" + hundredchars + "')"
        token2repr = repr(token2)
        assert token2repr == token2repr1 or token2repr == token2repr2
        assert token3repr == repr(token3)

    def test_equality(self):
        """check that equivalent tokens are considered equal"""
        token1 = tokens.Token()
        token2 = tokens.Token()
        token3 = tokens.Token(foo="bar", baz=123)
        token4 = tokens.Text(text="asdf")
        token5 = tokens.Text(text="asdf")
        token6 = tokens.TemplateOpen(text="asdf")

        assert token1 == token2
        assert token2 == token1
        assert token4 == token5
        assert token5 == token4
        assert token1 != token3
        assert token2 != token3
        assert token4 != token6
        assert token5 != token6

    @pytest.mark.parametrize("token", [
        tokens.Token(),
        tokens.Token(foo="bar", baz=123),
        tokens.Text(text="earwig")
    ])
    def test_repr_equality(self, token):
        """check that eval(repr(token)) == token"""
        assert token == eval(repr(token), vars(tokens))