Enable doctests

Author: dstansby

pyproject.toml

@@ -68,6 +68,7 @@ test = [
     "pytest-cov",
     "s3fs",
     "pytest-asyncio",
+    "pytest-doctestplus",
     "moto[s3]",
     "requests",
     "mypy",
@@ -360,8 +361,13 @@ doctest_optionflags = [
     "ELLIPSIS",
     "IGNORE_EXCEPTION_DETAIL",
 ]
+doctest_plus = 'enabled'
 addopts = [
-    "--durations=10", "-ra", "--strict-config", "--strict-markers",
+    "--durations=10",
+    "-ra",
+    "--strict-config",
+    "--strict-markers",
+    "--doctest-rst",
 ]
 filterwarnings = [
     "error:::zarr.*",