testCompile('de.flapdoodle.embed:de.flapdoodle.embed.mongo:1.46.0')

package com.example.springDemo;

import com.mongodb.DB;

import com.mongodb.MongoClient;

import de.flapdoodle.embed.mongo.MongodExecutable;

import de.flapdoodle.embed.mongo.MongodProcess;

import de.flapdoodle.embed.mongo.MongodStarter;

import de.flapdoodle.embed.mongo.config.MongodConfigBuilder;

import de.flapdoodle.embed.mongo.config.Net;

import de.flapdoodle.embed.mongo.distribution.Version;

import de.flapdoodle.embed.process.runtime.Network;

import org.junit.After;

import org.junit.Before;

public class MongodbBaseTest {

    private static final MongodStarter starter = MongodStarter.getDefaultInstance();

    protected MongoClient mongo;

    protected DB db;

    private MongodExecutable mongodExecutable;

    private MongodProcess mongod;

    @Before

    public void setUp() throws Exception {

        mongodExecutable = starter.prepare(new MongodConfigBuilder()

                .version(Version.Main.PRODUCTION)

                .net(new Net(12345, Network.localhostIsIPv6())).build());

        mongod = mongodExecutable.start();

        mongo = new MongoClient("localhost", 12345);

        db = mongo.getDB("embedded-mongo");

    }

    @After

    public void tearDown() throws Exception {

        mongod.stop();

        mongodExecutable.stop();

    }

}

package com.example.springDemo;

import com.mongodb.BasicDBObject;

import com.mongodb.BasicDBObjectBuilder;

import com.mongodb.DBCollection;

import com.mongodb.DBObject;

import org.junit.Before;

import org.junit.Test;

import static org.junit.Assert.assertThat;

import static org.hamcrest.CoreMatchers.is;

public class UserTest extends MongodbBaseTest {

    private DBCollection users;

    @Override

    @Before

    public void setUp() throws Exception {

        super.setUp();

        users = db.getCollection("users");

    }

    @Test

    public void should_insert_and_get_user() {

        final DBObject userDocument = new BasicDBObjectBuilder()

                .add("name", "lind")

                .get();

        users.insert(userDocument);

        final DBObject userDocumentFromDb = users.findOne(new BasicDBObject("_id", userDocument.get("_id")));

        assertThat(userDocumentFromDb.get("name"), is("lind"));

    }

}