add test for reachability thresholds, opentripplanner#2148.

src/test/java/org/opentripplanner/profile/PropagatedTimesStoreTest.java

@@ -0,0 +1,44 @@
+package org.opentripplanner.profile;
+
+import junit.framework.TestCase;
+import org.junit.Test;
+import org.opentripplanner.graph_builder.module.FakeGraph;
+import org.opentripplanner.routing.graph.Graph;
+
+/**
+ * Test the propagated times store.
+ */
+public class PropagatedTimesStoreTest extends TestCase {
+    /**
+     * Test that changing the reachability threshold works (i.e. averages are computed properly when destinations are
+     * only reachable part of the time).
+     */
+    @Test
+    public static void testReachability () throws Exception {
+        ProfileRequest pr = new ProfileRequest();
+        // old default: no restrictions o
+        pr.reachabilityThreshold = 0;
+
+        Graph g = new Graph();
+
+        PropagatedTimesStore pts = new PropagatedTimesStore(g, pr, 1);
+        // accessible one-third of the time
+        int[][] times = new int[][] {
+                new int[] { 1 },
+                new int[] { RaptorWorker.UNREACHED },
+                new int[] { RaptorWorker.UNREACHED }
+        };
+
+        pts.setFromArray(times, PropagatedTimesStore.ConfidenceCalculationMethod.MIN_MAX);
+
+        // it is reachable at least 0% of the time
+        assertEquals(1, pts.avgs[0]);
+
+        pr.reachabilityThreshold = 0.5f;
+        pts = new PropagatedTimesStore(g, pr, 1);
+        pts.setFromArray(times, PropagatedTimesStore.ConfidenceCalculationMethod.MIN_MAX);
+
+        // it is not reachable 50% of the time
+        assertEquals(RaptorWorker.UNREACHED, pts.avgs[0]);
+    }
+}