Basic tests for passengers

Signed-off-by: TheMode <themode@outlook.fr>

src/test/java/net/minestom/server/entity/PassengerIntegrationTest.java

@@ -0,0 +1,49 @@
+package net.minestom.server.entity;
+
+import net.minestom.server.api.Env;
+import net.minestom.server.api.EnvTest;
+import net.minestom.server.coordinate.Pos;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@EnvTest
+public class PassengerIntegrationTest {
+
+    @Test
+    public void passenger(Env env) {
+        var instance = env.createFlatInstance();
+        var vehicle = new Entity(EntityType.ZOMBIE);
+        var passenger = new Entity(EntityType.ZOMBIE);
+
+        vehicle.setInstance(instance, new Pos(0, 40, 0)).join();
+        passenger.setInstance(instance, new Pos(0, 40, 0)).join();
+
+        assertEquals(0, vehicle.getPassengers().size());
+        assertNull(passenger.getVehicle());
+
+        vehicle.addPassenger(passenger);
+        assertEquals(1, vehicle.getPassengers().size());
+        assertEquals(vehicle, passenger.getVehicle());
+    }
+
+    @Test
+    public void passengerTeleport(Env env) {
+        var instance = env.createFlatInstance();
+        var vehicle = new Entity(EntityType.ZOMBIE);
+        var passenger = new Entity(EntityType.ZOMBIE);
+
+        vehicle.setInstance(instance, new Pos(0, 40, 0)).join();
+        passenger.setInstance(instance, new Pos(0, 40, 5000)).join();
+
+        assertEquals(0, vehicle.getPassengers().size());
+        assertNull(passenger.getVehicle());
+
+        vehicle.addPassenger(passenger);
+        assertEquals(1, vehicle.getPassengers().size());
+        assertEquals(vehicle, passenger.getVehicle());
+
+        assertTrue(passenger.getDistance(vehicle) < 2);
+    }
+
+}