test_debug.py

# -*- coding: utf-8 -*-
"""
    jinja2.testsuite.debug
    ~~~~~~~~~~~~~~~~~~~~~~

    Tests the debug system.

    :copyright: (c) 2010 by the Jinja Team.
    :license: BSD, see LICENSE for more details.
"""
import pytest

import re

import sys
from traceback import format_exception

from jinja2 import Environment, TemplateSyntaxError
from traceback import format_exception


@pytest.fixture
def fs_env(filesystem_loader):
    '''returns a new environment.
    '''
    return Environment(loader=filesystem_loader)


@pytest.mark.debug
class TestDebug():

    def assert_traceback_matches(self, callback, expected_tb):
        try:
            callback()
        except Exception as e:
            tb = format_exception(*sys.exc_info())
            if re.search(expected_tb.strip(), ''.join(tb)) is None:
                assert False, ('Traceback did not match:\n\n%s\nexpected:\n%s' %
                               (''.join(tb), expected_tb))
        else:
            assert False, 'Expected exception'

    def test_runtime_error(self, fs_env):
        def test():
            tmpl.render(fail=lambda: 1 / 0)
        tmpl = fs_env.get_template('broken.html')
        self.assert_traceback_matches(test, r'''
  File ".*?broken.html", line 2, in (top-level template code|<module>)
    \{\{ fail\(\) \}\}
  File ".*debug?.pyc?", line \d+, in <lambda>
    tmpl\.render\(fail=lambda: 1 / 0\)
ZeroDivisionError: (int(eger)? )?division (or modulo )?by zero
''')

    def test_syntax_error(self, fs_env):
        # XXX: the .*? is necessary for python3 which does not hide
        # some of the stack frames we don't want to show.  Not sure
        # what's up with that, but that is not that critical.  Should
        # be fixed though.
        self.assert_traceback_matches(lambda: fs_env.get_template('syntaxerror.html'), r'''(?sm)
  File ".*?syntaxerror.html", line 4, in (template|<module>)
    \{% endif %\}.*?
(jinja2\.exceptions\.)?TemplateSyntaxError: Encountered unknown tag 'endif'. Jinja was looking for the following tags: 'endfor' or 'else'. The innermost block that needs to be closed is 'for'.
    ''')

    def test_regular_syntax_error(self, fs_env):
        def test():
            raise TemplateSyntaxError('wtf', 42)
        self.assert_traceback_matches(test, r'''
  File ".*debug.pyc?", line \d+, in test
    raise TemplateSyntaxError\('wtf', 42\)
(jinja2\.exceptions\.)?TemplateSyntaxError: wtf
  line 42''')