build(deps): Add xdoctest

See also:
- https://github.com/Erotemic/xdoctest
- https://www.youtube.com/watch?v=CUjCqOw_oFk

Author: tony

poetry.lock

@@ -59,6 +59,7 @@ pytest-rerunfailures = "*"
 pytest-mock = "*"
 pytest-watcher = "^0.2.3"
 Faker = "^13.3.4"
+xdoctest = "*"
 
 ### Coverage ###
 codecov = "*"
@@ -74,7 +75,7 @@ flake8 = "*"
 
 [tool.poetry.extras]
 docs = ["sphinx", "sphinx-issues", "sphinx-autoapi", "sphinx-autodoc-typehints", "sphinx-autobuild", "sphinx-copybutton", "sphinxext-opengraph", "sphinx-inline-tabs", "sphinxext-rediraffe", "myst_parser", "furo"]
-test = ["faker", "pytest", "pytest-rerunfailures", "pytest-mock", "pytest-watcher"]
+test = ["faker", "pytest", "pytest-rerunfailures", "pytest-mock", "pytest-watcher", "xdoctest"]
 coverage = ["codecov", "coverage", "pytest-cov"]
 format = ["black", "isort"]
 lint = ["flake8"]