Add regression test for StreetFlexPathCalculator

Author: leonardehrenfried

application/src/ext-test/java/org/opentripplanner/ext/flex/flexpathcalculator/StreetFlexPathCalculatorTest.java

@@ -0,0 +1,48 @@
+package org.opentripplanner.ext.flex.flexpathcalculator;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.opentripplanner.street.model.StreetModelForTest.intersectionVertex;
+import static org.opentripplanner.street.model.StreetModelForTest.streetEdge;
+
+import java.time.Duration;
+import org.junit.jupiter.api.Test;
+import org.opentripplanner.street.model.vertex.IntersectionVertex;
+
+class StreetFlexPathCalculatorTest {
+
+  private static final int IGNORED = -99;
+  private static final int EPSILON = 1000;
+  private static final int EXPECTED_DISTANCE = 471_653;
+
+  private final IntersectionVertex v0 = intersectionVertex(0, 0);
+  private final IntersectionVertex v1 = intersectionVertex(1, 1);
+  private final IntersectionVertex v2 = intersectionVertex(2, 2);
+  private final IntersectionVertex v3 = intersectionVertex(3, 3);
+
+  {
+    streetEdge(v0, v1);
+    streetEdge(v1, v0);
+    streetEdge(v1, v2);
+    streetEdge(v2, v1);
+    streetEdge(v2, v3);
+    streetEdge(v3, v2);
+  }
+
+  @Test
+  void forward() {
+    var forwardCalculator = new StreetFlexPathCalculator(false, Duration.ofDays(1));
+    var forwardPath = forwardCalculator.calculateFlexPath(v0, v3, IGNORED, IGNORED);
+    assertEquals("LINESTRING (0 0, 1 1, 2 2, 3 3)", forwardPath.getGeometry().toString());
+
+    assertEquals(EXPECTED_DISTANCE, forwardPath.distanceMeters, EPSILON);
+  }
+
+  @Test
+  void backward() {
+    var reverseCalculator = new StreetFlexPathCalculator(true, Duration.ofDays(1));
+    var reversePath = reverseCalculator.calculateFlexPath(v3, v0, IGNORED, IGNORED);
+    assertEquals("LINESTRING (3 3, 2 2, 1 1, 0 0)", reversePath.getGeometry().toString());
+
+    assertEquals(EXPECTED_DISTANCE, reversePath.distanceMeters, EPSILON);
+  }
+}