diff --git a/pyproject.toml b/pyproject.toml
index 7fa8ee2..9d8b549 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -73,11 +73,26 @@ repository = "https://github.com/vnmabus/rdata"
 requires = ["setuptools>=61.0"]
 build-backend = "setuptools.build_meta"
 
-[tool.setuptools.packages.find]
-include = ["rdata*"]
+[tool.mypy]
+strict = true
+strict_equality = true
+implicit_reexport = true
 
-[tool.setuptools.dynamic]
-version = {attr = "rdata.__version__"}
+[[tool.mypy.overrides]]
+module = [
+	"igraph.*",
+	"ipywidgets.*",
+]
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "examples.*"
+disallow_untyped_defs = false
+
+[tool.pytest.ini_options]
+addopts = "--doctest-modules --doctest-glob='*.rst'"
+doctest_optionflags = "NORMALIZE_WHITESPACE ELLIPSIS"
+norecursedirs = ".* build dist *.egg venv .svn _build docs/auto_examples examples"
 
 [tool.ruff.lint]
 select = [
@@ -116,18 +131,8 @@ convention = "google"
 [tool.ruff.lint.pylint]
 max-args = 7
 
-[tool.mypy]
-strict = true
-strict_equality = true
-implicit_reexport = true
-
-[[tool.mypy.overrides]]
-module = [
-	"igraph.*",
-	"ipywidgets.*",
-]
-ignore_missing_imports = true
+[tool.setuptools.packages.find]
+include = ["rdata*"]
 
-[[tool.mypy.overrides]]
-module = "examples.*"
-disallow_untyped_defs = false
+[tool.setuptools.dynamic]
+version = {attr = "rdata.__version__"}
\ No newline at end of file
diff --git a/rdata/tests/test_rdata.py b/rdata/tests/test_rdata.py
index 47dddfe..6c5a32f 100644
--- a/rdata/tests/test_rdata.py
+++ b/rdata/tests/test_rdata.py
@@ -8,6 +8,7 @@
 
 import numpy as np
 import pandas as pd
+import pytest
 import xarray
 
 import rdata
@@ -234,6 +235,7 @@ def test_list(self) -> None:
                 ],
         })
 
+    @pytest.mark.filterwarnings("ignore:Missing constructor")
     def test_file(self) -> None:
         """Test that external pointers can be parsed."""
         parsed = rdata.parser.parse_file(TESTDATA_PATH / "test_file.rda")
@@ -288,6 +290,7 @@ def test_minimal_function_uncompiled(self) -> None:
             "test_minimal_function_uncompiled <- function() NULL\n",
         )
 
+    @pytest.mark.filterwarnings("ignore:Missing constructor")
     def test_minimal_function(self) -> None:
         """Test that a minimal function (compiled) can be parsed."""
         parsed = rdata.parser.parse_file(
@@ -342,6 +345,7 @@ def test_empty_function_uncompiled(self) -> None:
             "test_empty_function_uncompiled <- function() {}\n",
         )
 
+    @pytest.mark.filterwarnings("ignore:Missing constructor")
     def test_empty_function(self) -> None:
         """Test that a simple function (compiled) can be parsed."""
         parsed = rdata.parser.parse_file(
@@ -374,6 +378,7 @@ def test_empty_function(self) -> None:
             "test_empty_function <- function() {}\n",
         )
 
+    @pytest.mark.filterwarnings("ignore:Missing constructor")
     def test_function(self) -> None:
         """Test that functions can be parsed."""
         parsed = rdata.parser.parse_file(
@@ -409,6 +414,7 @@ def test_function(self) -> None:
             "test_function <- function() {print(\"Hello\")}\n",
         )
 
+    @pytest.mark.filterwarnings("ignore:Missing constructor")
     def test_function_arg(self) -> None:
         """Test that functions can be parsed."""
         parsed = rdata.parser.parse_file(
@@ -566,7 +572,9 @@ def test_ts(self) -> None:
     def test_s4(self) -> None:
         """Test parsing of S4 classes."""
         parsed = rdata.parser.parse_file(TESTDATA_PATH / "test_s4.rda")
-        converted = rdata.conversion.convert(parsed)
+
+        with pytest.warns(UserWarning, match="Missing constructor"):
+            converted = rdata.conversion.convert(parsed)
 
         np.testing.assert_equal(converted, {
             "test_s4": SimpleNamespace(
diff --git a/setup.cfg b/setup.cfg
index d2a6a1d..dfcb41a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,11 +1,3 @@
-[aliases]
-test=pytest
-
-[tool:pytest]
-addopts = --doctest-modules --doctest-glob="*.rst"
-doctest_optionflags = NORMALIZE_WHITESPACE ELLIPSIS
-norecursedirs = .* build dist *.egg venv .svn _build docs/auto_examples examples
-
 [isort]
 multi_line_output = 3
 include_trailing_comma = true