diff --git a/pyproject.toml b/pyproject.toml
index ea596d9..b70a6d4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -61,6 +61,15 @@ exclude = ["eventio._dev_version"]
 [tool.setuptools_scm]
 version_file = "src/eventio/_version.py"
 
-
-[tool.pytest]
-addopts = "-v --durations=10"
+[tool.pytest.ini_options]
+minversion = "7"
+testpaths = ["tests"]
+log_cli_level = "INFO"
+xfail_strict = true
+# print summary of failed tests, force errors if settings are misspelled
+addopts = ["-ra", "--strict-config", "--strict-markers", "-v", "--durations=10"]
+filterwarnings = [
+    "error",
+    "ignore:File seems to be truncated:UserWarning",
+    "ignore:Version unknown:UserWarning",  # pycorsikaio
+]
diff --git a/src/eventio/base.py b/src/eventio/base.py
index 7cb36f8..61ef7b4 100644
--- a/src/eventio/base.py
+++ b/src/eventio/base.py
@@ -48,7 +48,7 @@ def seek(self, offset, whence=0):
         return self.pos
 
     def close(self):
-        return self.pipe.close()
+        pass
 
     def tell(self):
         return self.pos
@@ -144,9 +144,16 @@ def __exit__(self, exc_type, exc_value, traceback):
         self.close()
 
     def close(self):
-        self._filehandle.close()
         if self.read_process is not None:
             self.read_process.terminate()
+            self.read_process.stdout.close()
+            self.read_process.stderr.close()
+            self.read_process.wait(timeout=1)
+
+        self._filehandle.close()
+
+    def __del__(self):
+        self.close()
 
 
 def check_size_or_raise(data, expected_length, zero_ok=True):
diff --git a/tests/simtel/test_compare_hessio.py b/tests/simtel/test_compare_hessio.py
index 57e69ff..1a798fe 100644
--- a/tests/simtel/test_compare_hessio.py
+++ b/tests/simtel/test_compare_hessio.py
@@ -1,5 +1,4 @@
 import pytest
-from pkg_resources import resource_filename
 import numpy as np
 pyhessio = pytest.importorskip("pyhessio")
 
diff --git a/tests/test_open_file.py b/tests/test_open_file.py
index 82012a3..0c59c88 100644
--- a/tests/test_open_file.py
+++ b/tests/test_open_file.py
@@ -58,8 +58,7 @@ def test_types_gzip():
 def test_types_zcat():
     from eventio.base import PipeWrapper
     testfile = 'tests/resources/one_shower.dat.gz'
-    f = eventio.EventIOFile(testfile)
-
-    assert isinstance(f._filehandle, PipeWrapper)
-    types = [o.header.type for o in f]
-    assert types == [1200, 1212, 1201, 1202, 1203, 1204, 1209, 1210]
+    with eventio.EventIOFile(testfile) as f:
+        assert isinstance(f._filehandle, PipeWrapper)
+        types = [o.header.type for o in f]
+        assert types == [1200, 1212, 1201, 1202, 1203, 1204, 1209, 1210]