Unable to run a subset of template tests

[Tim Graham]

./runtests.py template_tests.syntax_tests

fails with RemovedInDjango20Warning on 9 of the tests complaining that "You haven't defined a TEMPLATES setting".

[Aymeric Augustin]

I can reproduce this.

I understand why these tests fail -- they run isolated from Django settings, and to make sure they don't accidentally use a globally configured DjangoTemplates engine, TEMPLATES is set to None for these tests.

What I fail to understand is why they pass when not run in isolation e.g. ./runtests.py template_tests. Perhaps I missed some cases when handling the setting_changed signal.

[Preston Timmons]

I took a look at this. I didn't find the exact issue, but I noticed a few things:

1. The tests that fail all have "{% load custom %}".

2. The tags that cause the problem are inclusion tags that have a "get_template" call in the decorator. Removing these removes the warnings.

3. I think there is a side-effect when template_tests.test_loaders is imported by unittest discovery.

The tests pass with this command:

./runtests.py template_tests.test_loaders template_tests.syntax_tests

But fail in reverse:

./runtests.py template_tests.test_loaders template_tests.syntax_tests --reverse

[Preston Timmons]

More specifically, a side-effect seems to appear in template_tests.test_loaders.DeprecatedRenderToStringTest.test_no_empty_dict_push_to_stack. The syntax_tests fail when run in combination with test_loaders if that method is removed.

[Preston Timmons]

I added a pull request for this. It fixes the problem by moving inclusion tags from template_tests.templatetags.custom into their own module, template_tests.templatetags.inclusion.

The warnings were masked before because template_tests.test_loaders.DeprecatedRenderToStringTest.test_no_empty_dict_pushed_to_stack uses a template that runs {% load custom %}. Since the get_template calls are evaluated at import time, no warning was raised when template_tests.syntax_tests later loaded that file.

Since the syntax_tests don't use the inclusion tags, the tests now run isolated from any global settings.

[Tim Graham <timograham@…>]

In 665e0aa6ec80a48492033a3b2b4ffdfaae3c78eb:

Fixed #24094 -- Enabled template tests to run individually.

[Aymeric Augustin]

Smart. Thanks a lot Preston.