diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..cd5dfff
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,27 @@
+import os
+import pytest
+import shlex
+import subprocess
+
+
+@pytest.fixture(autouse=True)
+def wrapper():
+    """
+    A wrapper function that clears the environment variables before each test
+    and stops the EMLE server after each test.
+    """
+
+    # Clear the environment.
+
+    for env in os.environ:
+        if env.startswith("EMLE_"):
+            del os.environ[env]
+
+    yield
+
+    # Stop the EMLE server.
+    process = subprocess.run(
+        shlex.split("emle-stop"),
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+    )
diff --git a/tests/test_external.py b/tests/test_external.py
index f87e2e5..f9e831f 100644
--- a/tests/test_external.py
+++ b/tests/test_external.py
@@ -6,22 +6,6 @@
 import tempfile
 
 
-@pytest.fixture(autouse=True)
-def teardown():
-    """
-    Clean up the environment.
-    """
-
-    yield
-
-    # Stop the EMLE server.
-    process = subprocess.run(
-        shlex.split("emle-stop"),
-        stdout=subprocess.PIPE,
-        stderr=subprocess.PIPE,
-    )
-
-
 def test_external_local_directory():
     """
     Make sure that the server can run using an external callback for the in
diff --git a/tests/test_interpolate.py b/tests/test_interpolate.py
index 4e1fbe6..7a2a07f 100644
--- a/tests/test_interpolate.py
+++ b/tests/test_interpolate.py
@@ -7,22 +7,6 @@
 import tempfile
 
 
-@pytest.fixture(autouse=True)
-def teardown():
-    """
-    Clean up the environment.
-    """
-
-    yield
-
-    # Stop the EMLE server.
-    process = subprocess.run(
-        shlex.split("emle-stop"),
-        stdout=subprocess.PIPE,
-        stderr=subprocess.PIPE,
-    )
-
-
 def parse_mdinfo(mdinfo_file):
     """
     Helper function to extract the total energy from AMBER mdinfo files.
diff --git a/tests/test_qm_xyz.py b/tests/test_qm_xyz.py
index 0564430..b015054 100644
--- a/tests/test_qm_xyz.py
+++ b/tests/test_qm_xyz.py
@@ -6,22 +6,6 @@
 import tempfile
 
 
-@pytest.fixture(autouse=True)
-def teardown():
-    """
-    Clean up the environment.
-    """
-
-    yield
-
-    # Stop the EMLE server.
-    process = subprocess.run(
-        shlex.split("emle-stop"),
-        stdout=subprocess.PIPE,
-        stderr=subprocess.PIPE,
-    )
-
-
 def test_qm_xyz():
     """
     Make sure that an xyz file for the QM region is written when requested.