Cleanup.

src/androidTest/java/de/dennisguse/opentracks/services/TrackRecordingServiceTestLocation.java

@@ -13,6 +13,7 @@ import androidx.test.rule.GrantPermissionRule;
 import androidx.test.rule.ServiceTestRule;
 
 import org.junit.After;
+import org.junit.AfterClass;
 import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.Rule;
@@ -64,6 +65,11 @@ public class TrackRecordingServiceTestLocation {
         if (Looper.myLooper() == null) Looper.prepare();
     }
 
+    @AfterClass
+    public static void finalTearDown() {
+        if (Looper.myLooper() != null) Looper.myLooper().quit();
+    }
+
     @Before
     public void setUp() throws TimeoutException {
         // Set up the mock content resolver