mwparserfromhell/tests/test_tokens.py

# Copyright (C) 2012-2020 Ben Kurtovic <ben.kurtovic@gmail.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
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# furnished to do so, subject to the following conditions:
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# The above copyright notice and this permission notice shall be included in
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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import unittest

from mwparserfromhell.parser import tokens

class TestTokens(unittest.TestCase):
    """Test cases for the Token class and its subclasses."""

    def test_issubclass(self):
        """check that all classes within the tokens module are really Tokens"""
        for name in tokens.__all__:
            klass = getattr(tokens, name)
            self.assertTrue(issubclass(klass, tokens.Token))
            self.assertIsInstance(klass(), klass)
            self.assertIsInstance(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)

        self.assertEqual("bar", token2.foo)
        self.assertEqual(123, token2.baz)
        self.assertFalse(token1.foo)
        self.assertFalse(token2.bar)

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

        self.assertEqual("eggs", token1.spam)
        self.assertEqual("ham", token2.foo)
        self.assertFalse(token2.baz)
        self.assertRaises(KeyError, delattr, token2, "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] + "..."

        self.assertEqual("Token()", repr(token1))
        self.assertTrue(repr(token2) in (
            "Token(foo='bar', baz=123)", "Token(baz=123, foo='bar')"))
        self.assertEqual("Text(text='" + hundredchars + "')", 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")

        self.assertEqual(token1, token2)
        self.assertEqual(token2, token1)
        self.assertEqual(token4, token5)
        self.assertEqual(token5, token4)
        self.assertNotEqual(token1, token3)
        self.assertNotEqual(token2, token3)
        self.assertNotEqual(token4, token6)
        self.assertNotEqual(token5, token6)

    def test_repr_equality(self):
        "check that eval(repr(token)) == token"
        tests = [
            tokens.Token(),
            tokens.Token(foo="bar", baz=123),
            tokens.Text(text="earwig")
        ]
        for token in tests:
            self.assertEqual(token, eval(repr(token), vars(tokens)))

if __name__ == "__main__":
    unittest.main(verbosity=2)