Añado repositorio y test correspondiente de la clase Reserva

src/main/java/com/carpooling/carpoolingaoraha/entidades/Reserva.java

@@ -63,6 +63,10 @@ public class Reserva {
         else return true;
     }
 
+    public void setIdReserva(int idReserva) {
+        this.idReserva = idReserva;
+    }
+
     public int getIdReserva() {
         return idReserva;
     }

src/main/java/com/carpooling/carpoolingaoraha/repositorios/ReservaRepository.java

+package com.carpooling.carpoolingaoraha.repositorios;
+
+import com.carpooling.carpoolingaoraha.entidades.Reserva;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ReservaRepository extends JpaRepository<Reserva, Integer> {
+    Reserva findByIdReserva(Integer idReserva);
+}

src/test/java/com/carpooling/carpoolingaoraha/repositorios/ReservaRepositoryTest.java

+package com.carpooling.carpoolingaoraha.repositorios;
+
+
+import com.carpooling.carpoolingaoraha.entidades.Reserva;
+import com.carpooling.carpoolingaoraha.entidades.Usuario;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.jdbc.AutoConfigureTestDatabase;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@DataJpaTest
+@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
+public class ReservaRepositoryTest {
+
+    @Autowired
+    private ReservaRepository repositorio;
+
+    @Test
+    public void testInsertUsuario(){
+        Reserva reserva = new Reserva();
+        reserva.setNumPasajeros(2);
+        reserva.setIdReserva(1);
+
+        repositorio.save(reserva);
+
+        Reserva reservaGuardada = repositorio.findByIdReserva(1);
+
+        Assert.assertNotNull(reservaGuardada);
+        Assert.assertEquals(2,reservaGuardada.getNumPasajeros());
+        Assert.assertEquals(1,reservaGuardada.getIdReserva());
+    }
+}