Implement config unit testing

pyproject.toml

@@ -21,8 +21,14 @@ main = [
     "validators>=0.34",
 ]
 pre-commit = ["pre-commit>=4.0"]
-test = ["pytest-cov>=6.1", "pytest>=8.3"]
-type-check = ["django-stubs[compatible-mypy]>=5.1", "mypy>=1.13", "types-beautifulsoup4>=4.12"]
+test = ["pytest-cov>=6.1.1", { include-group = "test-core" }]
+test-core = ["gitpython>=3.1.44", "pytest>=8.3"]
+type-check = [
+    "django-stubs[compatible-mypy]>=5.1",
+    "mypy>=1.13",
+    "types-beautifulsoup4>=4.12",
+    { include-group = "test-core" },
+]
 
 [project] # TODO: Remove [project] table once https://github.com/astral-sh/uv/issues/8582 is completed
 name = "TeX-Bot-Py-V2"
@@ -167,7 +173,7 @@ banned-aliases = { "regex" = [
 banned-from = ["abc", "re", "regex"]
 
 [tool.ruff.lint.per-file-ignores]
-"tests/**/test_*.py" = ["S101"]
+"tests/**/test_*.py" = ["S101", "S311", "SLF001"]
 
 [tool.ruff.lint.flake8-self]
 extend-ignore-names = ["_base_manager", "_default_manager", "_get_wrap_line_width", "_meta"]
@@ -206,13 +212,11 @@ parametrize-values-type = "tuple"
 [tool.ruff.lint.pyupgrade]
 keep-runtime-typing = true
 
-
 [tool.coverage.report]
 exclude_also = ["if TYPE_CHECKING:"]
 skip_covered = true
 sort = "cover"
 
-
 [tool.pymarkdown]
 extensions.front-matter.enabled = true
 mode.strict-config = true