How Can I Generate Spring REST Docs Snippets from the Contracts?

When you want to include the requests and responses of your API by using Spring REST Docs, you only need to make some minor changes to your setup if you are using MockMvc and RestAssuredMockMvc. To do so, include the following dependencies (if you have not already done so):

maven
gradle

<dependency>
	<groupId>org.springframework.cloud</groupId>
	<artifactId>spring-cloud-starter-contract-verifier</artifactId>
	<scope>test</scope>
</dependency>
<dependency>
	<groupId>org.springframework.restdocs</groupId>
	<artifactId>spring-restdocs-mockmvc</artifactId>
	<optional>true</optional>
</dependency>

testImplementation 'org.springframework.cloud:spring-cloud-starter-contract-verifier'
testImplementation 'org.springframework.restdocs:spring-restdocs-mockmvc'

Next, you need to make some changes to your base class. The following examples use WebAppContext and the standalone option with RestAssured:

WebAppContext
Standalone

import io.restassured.module.mockmvc.RestAssuredMockMvc;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.TestInfo;
import org.junit.jupiter.api.extension.ExtendWith;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.restdocs.RestDocumentationContextProvider;
import org.springframework.restdocs.RestDocumentationExtension;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;

import static org.springframework.restdocs.mockmvc.MockMvcRestDocumentation.document;
import static org.springframework.restdocs.mockmvc.MockMvcRestDocumentation.documentationConfiguration;

@ExtendWith(RestDocumentationExtension.class)
@SpringBootTest(classes = Application.class)
public abstract class FraudBaseWithWebAppSetup {

	@Autowired
	private WebApplicationContext context;

	@BeforeEach
	public void setup(TestInfo info, RestDocumentationContextProvider restDocumentation) {
		RestAssuredMockMvc.mockMvc(MockMvcBuilders.webAppContextSetup(this.context)
				.apply(documentationConfiguration(restDocumentation))
				.alwaysDo(document(
						getClass().getSimpleName() + "_" + info.getDisplayName()))
				.build());
	}

	protected void assertThatRejectionReasonIsNull(Object rejectionReason) {
		assert rejectionReason == null;
	}

}

import io.restassured.module.mockmvc.RestAssuredMockMvc;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.TestInfo;
import org.junit.jupiter.api.extension.ExtendWith;

import org.springframework.restdocs.RestDocumentationContextProvider;
import org.springframework.restdocs.RestDocumentationExtension;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;

import static org.springframework.restdocs.mockmvc.MockMvcRestDocumentation.document;
import static org.springframework.restdocs.mockmvc.MockMvcRestDocumentation.documentationConfiguration;

@ExtendWith(RestDocumentationExtension.class)
public abstract class FraudBaseWithStandaloneSetup {

	@BeforeEach
	public void setup(TestInfo info, RestDocumentationContextProvider restDocumentation) {
		RestAssuredMockMvc.standaloneSetup(MockMvcBuilders
				.standaloneSetup(new FraudDetectionController())
				.apply(documentationConfiguration(restDocumentation))
				.alwaysDo(document(
						getClass().getSimpleName() + "_" + info.getDisplayName())));
	}

}

You need not specify the output directory for the generated snippets (since version 1.2.0.RELEASE of Spring REST Docs).