From 06620b230c19a1d377643f1cddf83aaafc779a31 Mon Sep 17 00:00:00 2001
From: Michael Tsang <michael.tsang@jnction.co.uk>
Date: Tue, 26 Nov 2024 17:35:47 +0000
Subject: [PATCH] add test for #6197

---
 .../model/TimetableSnapshotTest.java          | 80 ++++++++++++++++++-
 1 file changed, 79 insertions(+), 1 deletion(-)

diff --git a/application/src/test/java/org/opentripplanner/model/TimetableSnapshotTest.java b/application/src/test/java/org/opentripplanner/model/TimetableSnapshotTest.java
index 4f3e12c1368..c0753a7fbf5 100644
--- a/application/src/test/java/org/opentripplanner/model/TimetableSnapshotTest.java
+++ b/application/src/test/java/org/opentripplanner/model/TimetableSnapshotTest.java
@@ -9,6 +9,7 @@
 import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.mock;
 
 import com.google.transit.realtime.GtfsRealtime.TripDescriptor;
 import com.google.transit.realtime.GtfsRealtime.TripDescriptor.ScheduleRelationship;
@@ -24,14 +25,21 @@
 import java.util.concurrent.atomic.AtomicBoolean;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
+import org.mockito.Mock;
 import org.opentripplanner.ConstantsForTests;
 import org.opentripplanner.TestOtpModel;
 import org.opentripplanner._support.time.ZoneIds;
 import org.opentripplanner.routing.algorithm.raptoradapter.transit.mappers.TransitLayerUpdater;
+import org.opentripplanner.transit.model.basic.TransitMode;
 import org.opentripplanner.transit.model.framework.Deduplicator;
 import org.opentripplanner.transit.model.framework.FeedScopedId;
 import org.opentripplanner.transit.model.framework.Result;
+import org.opentripplanner.transit.model.network.Route;
+import org.opentripplanner.transit.model.network.StopPattern;
 import org.opentripplanner.transit.model.network.TripPattern;
+import org.opentripplanner.transit.model.organization.Agency;
+import org.opentripplanner.transit.model.site.RegularStop;
+import org.opentripplanner.transit.model.site.StopLocation;
 import org.opentripplanner.transit.model.timetable.Trip;
 import org.opentripplanner.transit.model.timetable.TripIdAndServiceDate;
 import org.opentripplanner.transit.model.timetable.TripOnServiceDate;
@@ -46,7 +54,8 @@ public class TimetableSnapshotTest {
   private static final ZoneId timeZone = ZoneIds.GMT;
   public static final LocalDate SERVICE_DATE = LocalDate.of(2024, 1, 1);
   private static Map<FeedScopedId, TripPattern> patternIndex;
-  static String feedId;
+  private static String feedId;
+  private static Route route;
 
   @BeforeAll
   public static void setUp() throws Exception {
@@ -412,6 +421,75 @@ void testClear() {
     assertNotNull(snapshot.getRealtimeAddedRoute(pattern.getRoute().getId()));
   }
 
+  /**
+   * This test checks that an empty timetable is given to TransitLayerUpdater for previously
+   * added patterns after the buffer is cleared.
+   * <p>
+   * Refer to bug #6197 for details.
+   */
+  @Test
+  void testTransitLayerUpdateAfterAddPatternAndClear() {
+    var resolver = new TimetableSnapshot();
+    var today = LocalDate.now(timeZone);
+
+    var departureStopTime = new StopTime();
+    var arrivalStopTime = new StopTime();
+
+    departureStopTime.setDepartureTime(0);
+    departureStopTime.setArrivalTime(0);
+    departureStopTime.setStop(RegularStop.of(new FeedScopedId(feedId, "XX"), () -> 0).build());
+    arrivalStopTime.setDepartureTime(300);
+    arrivalStopTime.setArrivalTime(300);
+    arrivalStopTime.setStop(RegularStop.of(new FeedScopedId(feedId, "YY"), () -> 1).build());
+
+    var stopTimes = List.of(departureStopTime, arrivalStopTime);
+
+    var stopPattern = new StopPattern(stopTimes);
+
+    var route = patternIndex.values().stream().findFirst().orElseThrow().getRoute();
+    var pattern = TripPattern
+      .of(new FeedScopedId(feedId, "1.1"))
+      .withRoute(route)
+      .withStopPattern(stopPattern)
+      .withCreatedByRealtimeUpdater(true)
+      .build();
+
+    var tripTimes = TripTimesFactory.tripTimes(
+      Trip.of(new FeedScopedId(feedId, "addedTrip")).withRoute(route).build(),
+      stopTimes,
+      new Deduplicator()
+    );
+    var realTimeTripUpdate = new RealTimeTripUpdate(pattern, tripTimes, today, null, true, false);
+    var transitLayerUpdater = new TransitLayerUpdater(null) {
+      int count = 0;
+
+      @Override
+      public void update(
+        Collection<Timetable> updatedTimetables,
+        Map<TripPattern, SortedSet<Timetable>> timetables
+      ) {
+        var timetable = updatedTimetables.stream().findFirst().orElseThrow();
+        assertEquals(today, timetable.getServiceDate());
+        assertEquals(pattern, timetable.getPattern());
+
+        if (count == 1) {
+          // commited after clear
+          assertThat(timetable.getTripTimes()).isEmpty();
+        } else {
+          // commited with an update
+          assertThat(timetable.getTripTimes()).hasSize(1);
+        }
+        ++count;
+      }
+    };
+
+    resolver.update(realTimeTripUpdate);
+    resolver.commit(transitLayerUpdater, true);
+
+    resolver.clear(feedId);
+    resolver.commit(transitLayerUpdater, true);
+  }
+
   private static TimetableSnapshot createCommittedSnapshot() {
     TimetableSnapshot timetableSnapshot = new TimetableSnapshot();
     return timetableSnapshot.commit(null, true);