Streamlining Java Application Development With MongoDB: A Comprehensive Guide to Using Testcontainers

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                <dependency>
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            <groupId>org.mongodb</groupId>
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            <artifactId>mongodb-driver-sync</artifactId>
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            <version>5.1.0</version>
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        </dependency>
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        <dependency>
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            <groupId>org.junit.jupiter</groupId>
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            <artifactId>junit-jupiter-api</artifactId>
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            <version>5.10.2</version>
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            <scope>test</scope>
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        </dependency>
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        <dependency>
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            <groupId>org.junit.jupiter</groupId>
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            <artifactId>junit-jupiter-engine</artifactId>
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            <version>5.10.2</version>
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            <scope>test</scope>
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        </dependency>
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        <dependency>
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            <groupId>org.mockito</groupId>
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            <artifactId>mockito-core</artifactId>
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            <version>5.12.0</version>
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            <scope>test</scope>
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        </dependency>
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        <dependency>
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            <groupId>org.testcontainers</groupId>
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            <artifactId>testcontainers</artifactId>
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            <version>1.19.8</version>
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            <scope>test</scope>
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        </dependency>
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        <dependency>
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            <groupId>org.testcontainers</groupId>
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            <artifactId>junit-jupiter</artifactId>
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            <version>1.19.8</version>
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            <scope>test</scope>
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        </dependency>
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        <dependency>
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            <groupId>org.testcontainers</groupId>
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            <artifactId>mongodb</artifactId>
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            <version>1.19.8</version>
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            <scope>test</scope>
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        </dependency>

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@Container
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    private static final MongoDBContainer mongoDBContainer = new MongoDBContainer("mongo:7.0.0");

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@BeforeAll
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    public void setup() {
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        String uri = mongoDBContainer.getConnectionString();
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        mongoClient = MongoClients.create(uri);
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        database = mongoClient.getDatabase("testdb");
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        collection = database.getCollection("testCollection");
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        // Insert sample data
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        Document doc1 = new Document("title", "Inception").append("imdb", new Document("rating", 8.8));
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        Document doc2 = new Document("title", "The Room").append("imdb", new Document("rating", 3.7));
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        Document doc3 = new Document("title", "The Dark Knight").append("imdb", new Document("rating", 9.0));
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        collection.insertMany(List.of(doc1, doc2, doc3));
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    }

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@Test
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    void testMoviesWithHighRating() {
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        List<Document> resultDocuments = new ArrayList<>();
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        try (MongoCursor<Document> cursor = collection.find(Filters.gt("imdb.rating", 7))
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                .projection(new Document("title", 1).append("_id", 0))
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                .limit(5)
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                .iterator()) {
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            while (cursor.hasNext()) {
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                Document doc = cursor.next();
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                System.out.println(doc.toJson());
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                resultDocuments.add(doc);
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            }
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        }
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        assertEquals(2, resultDocuments.size());
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        for (Document doc : resultDocuments) {
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            assertTrue(doc.containsKey("title"));
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            assertFalse(doc.containsKey("_id"));
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        }
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    }

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@Container
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    public static MongoDBContainer mongoDBContainer = new MongoDBContainer(DockerImageName.parse("mongo:7.0.0"));

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@DynamicPropertySource
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    static void setProperties(DynamicPropertyRegistry registry) {
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        registry.add("spring.data.mongodb.uri", mongoDBContainer::getReplicaSetUrl);
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        registry.add("spring.data.mongodb.database", () -> "testdb");
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    }
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    @BeforeAll
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    public static void setUpAll() {
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        String mongoUri = mongoDBContainer.getConnectionString();
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        mongoClient = MongoClients.create(mongoUri);
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    }
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    @BeforeEach
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    public void setUp() {
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        salesRepository.save(createMockSales());
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    }
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    private Sales createMockSales() {
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        Item item1 = new Item("Item1", Arrays.asList("Tag1", "Tag2"), new BigDecimal("19.99"), 2);
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        Item item2 = new Item("Item2", Arrays.asList("Tag3", "Tag4"), new BigDecimal("29.99"), 1);
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        List<Item> items = Arrays.asList(item1, item2);
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        Customer customer = new Customer("Male", 30, "customer@example.com", 5);
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        return new Sales(new ObjectId(), new Date(), items, "Store1", customer, true, "Online");
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    }

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 @Test
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    public void testFindAll() {
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        List<Sales> salesList = salesRepository.findAll();
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        assertThat(salesList).isNotEmpty();
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        assertThat(salesList.size()).isEqualTo(1);
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        Sales sales = salesList.get(0);
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        assertThat(sales.getStoreLocation()).isEqualTo("Store1");
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        assertThat(sales.getCustomer().getEmail()).isEqualTo("customer@example.com");
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        assertThat(sales.getItems()).hasSize(2);
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    }