diff --git a/tests/__init__.py b/tests/__init__.py
index eda947472..cb306a886 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -334,7 +334,11 @@ class PortalMock:
     """
 
     def __init__(
-        self, dbus_test_case, portal_name: str, app_id: str = "org.example.App"
+        self,
+        dbus_test_case,
+        portal_name: str,
+        app_id: str = "org.example.App",
+        umockdev=None,
     ):
         self.dbus_test_case = dbus_test_case
         self.portal_name = portal_name
@@ -344,6 +348,7 @@ def __init__(
         self.portal_interfaces: Dict[str, dbus.Interface] = {}
         self.app_id = app_id
         self.busses = {dbusmock.BusType.SYSTEM: {}, dbusmock.BusType.SESSION: {}}
+        self.umockdev = umockdev
 
     @property
     def interface_name(self) -> str:
@@ -420,6 +425,22 @@ def mock_interface(self):
         )
         return dbus.Interface(obj, dbusmock.MOCK_IFACE)
 
+    def _maybe_add_asan_preload(self, executable, env):
+        # ASAN really wants to be the first library to get loaded but we also
+        # LD_PRELOAD umockdev and LD_PRELOAD gets loaded before any "normally"
+        # linked libraries. This uses ldd to find the version of libasan.so that
+        # should be loaded and puts it in front of LD_PRELOAD.
+        # This way, LD_PRELOAD and ASAN can be used at the same time.
+        ldd = subprocess.check_output(["ldd", executable]).decode("utf-8")
+        libs = [line.split()[0] for line in ldd.splitlines()]
+        try:
+            libasan = next(filter(lambda lib: lib.startswith("libasan"), libs))
+        except StopIteration:
+            return
+
+        preload = env.get("LD_PRELOAD", "")
+        env["LD_PRELOAD"] = f"{libasan}:{preload}"
+
     def start_xdp(self):
         """
         Start the xdg-desktop-portal process
@@ -437,6 +458,9 @@ def start_xdp(self):
         env["XDG_CURRENT_DESKTOP"] = "test"
         env["XDG_DESKTOP_PORTAL_TEST_APP_ID"] = self.app_id
 
+        if self.umockdev:
+            env["UMOCKDEV_DIR"] = self.umockdev.get_root_dir()
+
         asan_suppression = (
             Path(os.getenv("G_TEST_SRCDIR", "tests")) / "asan.suppression"
         )
@@ -471,6 +495,9 @@ def start_portal_frontend(self, env):
                 f"{portal_frontend} does not exist, try running from meson build dir or setting G_TEST_BUILDDIR"
             )
 
+        env = env.copy()
+        self._maybe_add_asan_preload(portal_frontend, env)
+
         portal_frontend = subprocess.Popen([portal_frontend], env=env)
 
         for _ in range(50):
@@ -510,6 +537,9 @@ def start_permission_store(self, env):
                 f"{permission_store_path} does not exist, try running from meson build dir or setting G_TEST_BUILDDIR"
             )
 
+        env = env.copy()
+        self._maybe_add_asan_preload(permission_store_path, env)
+
         permission_store = subprocess.Popen([permission_store_path], env=env)
 
         for _ in range(50):
diff --git a/tests/conftest.py b/tests/conftest.py
index e6ec5fea5..76af3ce70 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -7,15 +7,25 @@
 import pytest
 import dbusmock
 import os
+import sys
 import tempfile
 
 from tests import PortalMock
 
 
 def pytest_configure():
+    ensure_umockdev_loaded()
     create_test_dirs()
 
 
+def ensure_umockdev_loaded():
+    umockdev_preload = "libumockdev-preload.so"
+    preload = os.environ.get("LD_PRELOAD", "")
+    if umockdev_preload not in preload:
+        os.environ["LD_PRELOAD"] = f"{umockdev_preload}:{preload}"
+        os.execv(sys.executable, [sys.executable] + sys.argv)
+
+
 def create_test_dirs():
     env_dirs = [
         "HOME",
@@ -123,14 +133,22 @@ def app_id():
     return "org.example.App"
 
 
+@pytest.fixture
+def umockdev():
+    """
+    Default fixture providing a umockdev testbed
+    """
+    return None
+
+
 @pytest.fixture
 def portal_mock(
-    dbus_test_case, portal_name, required_templates, template_params, app_id
+    dbus_test_case, portal_name, required_templates, template_params, app_id, umockdev
 ) -> PortalMock:
     """
     Fixture yielding a PortalMock object with the impl started, if applicable.
     """
-    pmock = PortalMock(dbus_test_case, portal_name, app_id)
+    pmock = PortalMock(dbus_test_case, portal_name, app_id, umockdev)
 
     for template, params in required_templates.items():
         params = template_params.get(template, params)