tests/py: Check x-d-p exit code and add ASAN suppression

This makes sure that the portal frontend exited cleanly. This includes
no memory leaks detected by ASAN and for that to work we need our
suppression file.

tests/__init__.py

@@ -34,6 +34,7 @@
 import os
 import subprocess
 import time
+import signal
 
 DBusGMainLoop(set_as_default=True)
 
@@ -425,10 +426,9 @@ def start_xdp(self):
         """
 
         portal_dir = Path(os.getenv("G_TEST_BUILDDIR", "tests")) / "portals" / "test"
-
         if not portal_dir.exists():
             raise FileNotFoundError(
-                f"{portal_dir} does not exist, try running from meson build dir or setting G_TEST_SRCDIR"
+                f"{portal_dir} does not exist, try running from meson build dir or setting G_TEST_BUILDDIR"
             )
 
         env = os.environ.copy()
@@ -437,6 +437,16 @@ def start_xdp(self):
         env["XDG_CURRENT_DESKTOP"] = "test"
         env["XDG_DESKTOP_PORTAL_TEST_APP_ID"] = self.app_id
 
+        asan_suppression = (
+            Path(os.getenv("G_TEST_SRCDIR", "tests")) / "asan.suppression"
+        )
+        if not asan_suppression.exists():
+            raise FileNotFoundError(
+                f"{asan_suppression} does not exist, try running from meson build dir or setting G_TEST_SRCDIR"
+            )
+
+        env["LSAN_OPTIONS"] = f"suppressions={asan_suppression}"
+
         self.start_dbus_monitor()
         self.start_portal_frontend(env)
         self.start_permission_store(env)
@@ -527,8 +537,10 @@ def tear_down(self):
             self.dbus_monitor.wait()
 
         if self.portal_frontend:
-            self.portal_frontend.terminate()
-            self.portal_frontend.wait()
+            # give it a chance to shut down cleanly
+            self.portal_frontend.send_signal(signal.SIGHUP)
+            returncode = self.portal_frontend.wait()
+            assert returncode == 0
 
         if self.permission_store:
             self.permission_store.terminate()

tests/meson.build

@@ -292,6 +292,10 @@ if enable_pytest
 
   pytest_args = ['--verbose', '--log-level=DEBUG']
 
+  pytest_env = environment()
+  pytest_env.set('G_TEST_SRCDIR', meson.current_source_dir())
+  pytest_env.set('G_TEST_BUILDDIR', meson.current_build_dir())
+
   # pytest xdist is nice because it significantly speeds up our
   # test process, but it's not required
   if pymod.find_installation('python3', modules: ['xdist'], required: false).found()
@@ -323,6 +327,7 @@ if enable_pytest
         'pytest/@0@'.format(testname),
         pytest,
         args: pytest_args + ['-k', testname],
+        env: pytest_env,
         suite: ['pytest'],
         timeout: 120,
       )