![\"\"](\"https:\/\/i0.wp.com\/bullyrooks.com\/wp-content\/uploads\/2022\/01\/image-47.png?resize=256%2C342&ssl=1\")
<\/figure>\n\n\n\nImplementing the TestContainer<\/h2>\n\n\n\n
Add these dependencies to your pom.xml<\/p>\n\n\n\n
...\n <properties>\n...\n <javafaker.version>0.15<\/javafaker.version>\n...\n <\/properties>\n...\n <dependency>\n <groupId>org.testcontainers<\/groupId>\n <artifactId>mongodb<\/artifactId>\n <version>1.16.2<\/version>\n <scope>test<\/scope>\n <\/dependency>\n <dependency>\n <groupId>com.github.javafaker<\/groupId>\n <artifactId>javafaker<\/artifactId>\n <version>${javafaker.version}<\/version>\n <\/dependency><\/code><\/pre>\n\n\n\nFirst, I’m going to modify a few thing. First, add a builder to the CreateMessageRequestDTO <\/code>object so I can build test data easier:<\/p>\n\n\n\npackage com.bullyrooks.cloud_application.controller.dto;\n\nimport lombok.AllArgsConstructor;\nimport lombok.Builder;\nimport lombok.Data;\nimport lombok.NoArgsConstructor;\n\n@Data\n@Builder\n@AllArgsConstructor\n@NoArgsConstructor\npublic class CreateMessageRequestDTO {\n private String firstName;\n private String lastName;\n private String message;\n}\n<\/code><\/pre>\n\n\n\nThen I’m going to update CreateMessageResponseDTO <\/code>so that I can return the messageId<\/code>, so I can run my verifications<\/p>\n\n\n\npackage com.bullyrooks.cloud_application.controller.dto;\n\nimport lombok.Data;\n\n@Data\npublic class CreateMessageResponseDTO {\n private String messageId;\n private String firstName;\n private String lastName;\n private String message;\n}\n<\/code><\/pre>\n\n\n\nCreate a new class called MessageControllerTest<\/code> in the test path under the com.bullyrooks.cloud_application.controller<\/code> package. Add this code<\/p>\n\n\n\npackage com.bullyrooks.cloud_application.controller;
import com.bullyrooks.cloud_application.controller.dto.CreateMessageRequestDTO;
import com.bullyrooks.cloud_application.controller.dto.CreateMessageResponseDTO;
import com.bullyrooks.cloud_application.repository.MessageRepository;
import com.bullyrooks.cloud_application.repository.document.MessageDocument;
import com.github.javafaker.Faker;
import com.github.javafaker.service.FakeValuesService;
import com.github.javafaker.service.RandomService;
import lombok.extern.slf4j.Slf4j;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.web.server.LocalServerPort;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.test.context.ActiveProfiles;
import org.springframework.test.context.DynamicPropertyRegistry;
import org.springframework.test.context.DynamicPropertySource;
import org.springframework.test.context.junit.jupiter.SpringExtension;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.UriComponents;
import org.springframework.web.util.UriComponentsBuilder;
import org.testcontainers.containers.MongoDBContainer;
import java.util.List;
import java.util.Locale;
import static org.junit.jupiter.api.Assertions.assertEquals<\/em>;
import static org.mockito.Mockito.when<\/em>;
@ExtendWith(SpringExtension.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT<\/em>)
@Slf4j
@AutoConfigureMockMvc
@ActiveProfiles(\"test\")
public class MessageControllerTest {
static MongoDBContainer mongoDBContainer <\/em>= new MongoDBContainer(\"mongo:4.4.10\");
{
mongoDBContainer<\/em>.start();
}
@DynamicPropertySource
static void setProperties(DynamicPropertyRegistry registry) {
registry.add(\"spring.data.mongodb.uri\", mongoDBContainer<\/em>::getReplicaSetUrl);
}
private final String MESSAGE_PATH = \"\/message\";
@LocalServerPort
int randomServerPort;
@Autowired
MessageRepository messageRepository;
FakeValuesService fakesvc = new FakeValuesService(
new Locale(\"en-US\"), new RandomService());
Faker faker = new Faker();
@Test
void testGetOpportunitiesForNotification(){
Long userId = 1l;
\/\/given
CreateMessageRequestDTO request = CreateMessageRequestDTO
.builder<\/em>()
.firstName(faker.name().firstName())
.lastName(faker.name().lastName())
.message(faker.gameOfThrones().quote())
.build();
\/\/when
RestTemplate restTemplate = new RestTemplate();
String baseUrl = \"http:\/\/localhost:\" + randomServerPort + MESSAGE_PATH;
UriComponents builder = UriComponentsBuilder.fromHttpUrl<\/em>(baseUrl)
.build();
ResponseEntity<CreateMessageResponseDTO> result = restTemplate.postForEntity(
builder.toUri(), request, CreateMessageResponseDTO.class);
\/\/then
CreateMessageResponseDTO dto = result.getBody();
assertEquals<\/em>(request.getFirstName(), dto.getFirstName());
assertEquals<\/em>(request.getLastName(), dto.getLastName());
assertEquals<\/em>(request.getMessage(), dto.getMessage());
MessageDocument savedDoc = messageRepository.findById(dto.getMessageId()).get();
assertEquals<\/em>(request.getFirstName(), savedDoc.getFirstName());
assertEquals<\/em>(request.getLastName(), savedDoc.getLastName());
assertEquals<\/em>(request.getMessage(), savedDoc.getMessage());
}
}<\/pre>\n\n\n\nLet me explain what’s going on here. First, I’m telling maven (and spring) that I have a dependency on a docker image that will allow me to mock MongoDB. I’m also telling spring boot test to stand that image up in this test and wherever I reference my mongodb uri, use the docker instance (via spring.data.mongodb.<\/code>uri )<\/p>\n\n\n\nNext, I’m standing up an instance of faker, which will allow me to mock up test data in a random way, so that test data should never collide.<\/p>\n\n\n\n
Then I’m making a request against my controller endpoint, getting the response and verifying the response matches the request.<\/p>\n\n\n\n
Finally, I’m going to the database instance (the docker image) and verifying the state of the database for my messageId<\/code>. This confirms that the record was ‘written’.<\/p>\n\n\n\nRun this test and it should pass.<\/p>\n\n\n\n
Git Commit and Push<\/h2>\n\n\n\n$ git add .\nwarning: LF will be replaced by CRLF in pom.xml.\nThe file will have its original line endings in your working directory\n\n$ git commit -m \"new component test\"\n[database 813361e] new component test\n 4 files changed, 119 insertions(+)\n create mode 100644 src\/test\/java\/com\/bullyrooks\/cloud_application\/controller\/MessageControllerTest.java\n\n$ git push\nEnumerating objects: 35, done.\nCounting objects: 100% (35\/35), done.\nDelta compression using up to 4 threads\nCompressing objects: 100% (13\/13), done.\nWriting objects: 100% (20\/20), 2.76 KiB | 706.00 KiB\/s, done.\nTotal 20 (delta 5), reused 0 (delta 0), pack-reused 0\nremote: Resolving deltas: 100% (5\/5), completed with 5 local objects.\nTo github.com-bullyrook:bullyrooks\/cloud_application.git\n f6b7f59..813361e database -> database\n<\/code><\/pre>\n\n\n\n<\/p>\n","protected":false},"excerpt":{"rendered":"