Added mongodb container test sample

FoodOrdersManagerTest.kt

import kotlinx.coroutines.runBlocking
import org.bson.types.ObjectId
import org.junit.*

import org.junit.Assert.*
import org.testcontainers.containers.MongoDBContainer
import org.testcontainers.containers.wait.strategy.HostPortWaitStrategy
import org.testcontainers.utility.DockerImageName
import java.math.BigInteger
import java.time.Duration

class FoodOrdersManagerTest {

    companion object {

        val mongoDBContainer = MongoDBContainer(DockerImageName.parse("mongo:4.0.10"))
            .withExposedPorts(27017)
            .waitingFor(HostPortWaitStrategy())
            .withStartupTimeout(Duration.ofMinutes(5))
        @BeforeClass
        @JvmStatic
        fun setup() {
            mongoDBContainer.start();
        }

        @JvmStatic
        @AfterClass
        fun tearDown() {
            mongoDBContainer.stop()
        }
    }



    @Test
    fun insertAndReadFavApps() = runBlocking {
        DbCrudManager.MONGO_DB_HOST_NAME = mongoDBContainer.host
        DbCrudManager.MONGO_DB_PORT = mongoDBContainer.firstMappedPort

        val response1 = FoodOrdersManager.getOrders(getOrdersRequest {
            this.userId = userIdDynamic
        })
        assertTrue(response1.data.ordersList.isEmpty());

        val response2 = FoodOrdersManagerTest.addOrder(addFoodOrderRequest {
            this.isFav = true
            this.userId = userIdDynamic
            this.placeId = placeId1Dynamic
            this.resourceId = "a:b:c"
        })
        
        assertTrue(response2.data.ordersList.isNotEmpty());
    }
}