File: test_github_links.py

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import pathlib
import sys

from django.test import SimpleTestCase


def last_n_parts(path, n):
    return "/".join(path.parts[-n:])


# The import must happen at the end of setUpClass, so it can't be imported at
# the top of the file.
github_links = None


class GitHubLinkTests(SimpleTestCase):
    @classmethod
    def setUpClass(cls):
        # The file implementing the code under test is in the docs folder and
        # is not part of the Django package. This means it cannot be imported
        # through standard means. Include its parent in the pythonpath for the
        # duration of the tests to allow the code to be imported.
        cls.ext_path = str((pathlib.Path(__file__).parents[2] / "docs/_ext").resolve())
        sys.path.insert(0, cls.ext_path)
        cls.addClassCleanup(sys.path.remove, cls.ext_path)
        cls.addClassCleanup(sys.modules.pop, "github_links", None)
        # Linters/IDEs may not be able to detect this as a valid import.
        import github_links as _github_links

        global github_links
        github_links = _github_links

    def test_code_locator(self):
        locator = github_links.CodeLocator.from_code(
            """
from a import b, c
from .d import e, f as g

def h():
    pass

class I:
    def j(self):
        pass"""
        )

        self.assertEqual(locator.node_line_numbers, {"h": 5, "I": 8, "I.j": 9})
        self.assertEqual(locator.import_locations, {"b": "a", "c": "a", "e": ".d"})

    def test_module_name_to_file_path_package(self):
        path = github_links.module_name_to_file_path("django")

        self.assertEqual(last_n_parts(path, 2), "django/__init__.py")

    def test_module_name_to_file_path_module(self):
        path = github_links.module_name_to_file_path("django.shortcuts")

        self.assertEqual(last_n_parts(path, 2), "django/shortcuts.py")

    def test_get_path_and_line_class(self):
        path, line = github_links.get_path_and_line(
            module="tests.sphinx.testdata.package.module", fullname="MyClass"
        )

        self.assertEqual(
            last_n_parts(path, 5), "tests/sphinx/testdata/package/module.py"
        )
        self.assertEqual(line, 12)

    def test_get_path_and_line_func(self):
        path, line = github_links.get_path_and_line(
            module="tests.sphinx.testdata.package.module", fullname="my_function"
        )

        self.assertEqual(
            last_n_parts(path, 5), "tests/sphinx/testdata/package/module.py"
        )
        self.assertEqual(line, 24)

    def test_get_path_and_line_method(self):
        path, line = github_links.get_path_and_line(
            module="tests.sphinx.testdata.package.module", fullname="MyClass.my_method"
        )

        self.assertEqual(
            last_n_parts(path, 5), "tests/sphinx/testdata/package/module.py"
        )
        self.assertEqual(line, 16)

    def test_get_path_and_line_cached_property(self):
        path, line = github_links.get_path_and_line(
            module="tests.sphinx.testdata.package.module",
            fullname="MyClass.my_cached_property",
        )

        self.assertEqual(
            last_n_parts(path, 5), "tests/sphinx/testdata/package/module.py"
        )
        self.assertEqual(line, 20)

    def test_get_path_and_line_forwarded_import(self):
        path, line = github_links.get_path_and_line(
            module="tests.sphinx.testdata.package.module", fullname="MyOtherClass"
        )

        self.assertEqual(
            last_n_parts(path, 5), "tests/sphinx/testdata/package/other_module.py"
        )
        self.assertEqual(line, 1)

    def test_get_path_and_line_wildcard_import(self):
        path, line = github_links.get_path_and_line(
            module="tests.sphinx.testdata.package.module", fullname="WildcardClass"
        )

        self.assertEqual(
            last_n_parts(path, 5),
            "tests/sphinx/testdata/package/wildcard_module.py",
        )
        self.assertEqual(line, 4)

        path, line = github_links.get_path_and_line(
            module="tests.sphinx.testdata.package.module",
            fullname="WildcardMixin",
        )
        self.assertEqual(
            last_n_parts(path, 5),
            "tests/sphinx/testdata/package/wildcard_base.py",
        )
        self.assertEqual(line, 1)

    def test_get_path_and_line_forwarded_import_module(self):
        path, line = github_links.get_path_and_line(
            module="tests.sphinx.testdata.package.module",
            fullname="other_module.MyOtherClass",
        )

        self.assertEqual(
            last_n_parts(path, 5), "tests/sphinx/testdata/package/other_module.py"
        )
        self.assertEqual(line, 1)

    def test_get_branch_stable(self):
        branch = github_links.get_branch(version="2.2", next_version="3.2")
        self.assertEqual(branch, "stable/2.2.x")

    def test_get_branch_latest(self):
        branch = github_links.get_branch(version="3.2", next_version="3.2")
        self.assertEqual(branch, "main")

    def test_github_linkcode_resolve_unspecified_domain(self):
        domain = "unspecified"
        info = {}
        self.assertIsNone(
            github_links.github_linkcode_resolve(
                domain, info, version="3.2", next_version="3.2"
            )
        )

    def test_github_linkcode_resolve_unspecified_info(self):
        domain = "py"
        info = {"module": None, "fullname": None}
        self.assertIsNone(
            github_links.github_linkcode_resolve(
                domain, info, version="3.2", next_version="3.2"
            )
        )

    def test_github_linkcode_resolve_not_found(self):
        info = {
            "module": "foo.bar.baz.hopefully_non_existant_module",
            "fullname": "MyClass",
        }
        self.assertIsNone(
            github_links.github_linkcode_resolve(
                "py", info, version="3.2", next_version="3.2"
            )
        )

    def test_github_linkcode_resolve_link_to_object(self):
        info = {
            "module": "tests.sphinx.testdata.package.module",
            "fullname": "MyClass",
        }
        self.assertEqual(
            github_links.github_linkcode_resolve(
                "py", info, version="3.2", next_version="3.2"
            ),
            "https://github.com/django/django/blob/main/tests/sphinx/"
            "testdata/package/module.py#L12",
        )

    def test_github_linkcode_resolve_link_to_class_older_version(self):
        info = {
            "module": "tests.sphinx.testdata.package.module",
            "fullname": "MyClass",
        }
        self.assertEqual(
            github_links.github_linkcode_resolve(
                "py", info, version="2.2", next_version="3.2"
            ),
            "https://github.com/django/django/blob/stable/2.2.x/tests/sphinx/"
            "testdata/package/module.py#L12",
        )

    def test_import_error(self):
        msg = "Could not import '.....test' in 'tests.sphinx.testdata.package'."
        with self.assertRaisesMessage(ImportError, msg):
            github_links.get_path_and_line(
                module="tests.sphinx.testdata.package.import_error", fullname="Test"
            )