Please refere below code snipped

import com.mongodb.ConnectionString;
import com.mongodb.MongoClientSettings;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import org.bson.UuidRepresentation;
import org.jobrunr.storage.StorageProvider;
import org.jobrunr.storage.nosql.documentdb.AmazonDocumentDBStorageProvider;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class BeanConfig {

    @Value("${mongodb.host}")
    private String mongoHost;

    @Value("${mongodb.username}")
    private String username;

    @Value("${mongodb.password}")
    private String password;

    @Bean
    public StorageProvider getStorageProvider() {
        return getAmazonDocumentDB();
    }

    private AmazonDocumentDBStorageProvider getAmazonDocumentDB() {
        ConnectionString connectionString = new ConnectionString(getAmazonDocumentDbConnectionString());
        MongoClientSettings.builder().applyConnectionString(connectionString);
        final MongoClientSettings mongoClientSettings = MongoClientSettings.builder()
                .applyConnectionString(connectionString)
                .uuidRepresentation(UuidRepresentation.JAVA_LEGACY)
                .build();
        final MongoClient mongoClient = MongoClients.create(mongoClientSettings);
        return new AmazonDocumentDBStorageProvider(mongoClient);
    }

    private String getAmazonDocumentDbConnectionString() {
        final String template = "mongodb://%s:%s@%s/?replicaSet=rs0&readpreference=%s&retryWrites=false";
        final String username = this.username;
        final String password = this.password;
        final String host = this.mongoHost;
        final String readPreference = "secondaryPreferred";
        return String.format(template, username, password, host, readPreference);
    }
}

I want to write unit tests for the above Configuration to pass sonar test in pipeline(95% coverage is required) But I am unable to mock mongoDb.

Below is the code written for unit test

@ExtendWith({MockitoExtension.class})
public class BeanConfigTest {

    @InjectMocks
    private BeanConfig beanConfig;

    @Value("${mongodb.host}")
    private String mongoHost = "localhost:27017";

    @Value("${mongodb.username}")
    private String username = "user";

    @Value("${mongodb.password}")
    private String password = "pass";
    ;

    private static MockedStatic<MongoClientSettings> mongoClientSettings = Mockito.mockStatic(MongoClientSettings.class);

    private static MockedStatic<MongoClients> mongoClients = Mockito.mockStatic(MongoClients.class);

    private static MongoClient mockMongoClient = Mockito.mock(MongoClient.class);

    @InjectMocks
    private ActionHandler actionHandler;

    @Mock
    private StorageService storageService;

    @BeforeAll
    public static void init(){
        mongoClients.when(() -> MongoClients.create(any(MongoClientSettings.class))).thenReturn(mockMongoClient);
    }


    @Test
    public void testActionHandler() {
        StorageProvider storageProvider = beanConfig.getStorageProvider();
        assertNotNull(storageProvider);
    }

Getting below error

java.lang.NullPointerException: Cannot invoke "com.mongodb.client.MongoDatabase.getCollection(String)" because "this.jobrunrDatabase" is null

    at org.jobrunr.storage.nosql.mongo.MongoDBCreator.<init>(MongoDBCreator.java:49)
    at org.jobrunr.storage.nosql.mongo.MongoDBCreator.<init>(MongoDBCreator.java:42)
    at org.jobrunr.storage.nosql.documentdb.AmazonDocumentDBStorageProvider.runMigrations(AmazonDocumentDBStorageProvider.java:59)
    at org.jobrunr.storage.nosql.mongo.MongoDBStorageProvider.setUpStorageProvider(MongoDBStorageProvider.java:145)
    at org.jobrunr.storage.nosql.mongo.MongoDBStorageProvider.<init>(MongoDBStorageProvider.java:126)
    at org.jobrunr.storage.nosql.mongo.MongoDBStorageProvider.<init>(MongoDBStorageProvider.java:111)
    at org.jobrunr.storage.nosql.mongo.MongoDBStorageProvider.<init>(MongoDBStorageProvider.java:91)
    at org.jobrunr.storage.nosql.documentdb.AmazonDocumentDBStorageProvider.<init>(AmazonDocumentDBStorageProvider.java:26)
    at com.cs.config.BeanConfig.getAmazonDocumentDB(BeanConfig.java:39)
    at com.cs.config.BeanConfig.getStorageProvider(BeanConfig.java:28)
    at com.cs.config.BeanConfigTest.testActionHandler(BeanConfigTest.java:87)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)

please guide me How to write unit tests for the COnfiguration Class mentioned above.

Trying to write unit tests, but unable to mock mongo and jobrunr dependencies.