Auto-configured Spring GraphQL Tests

Spring GraphQL offers a dedicated testing support module; you’ll need to add it to your project:

Maven

<dependencies>
  <dependency>
    <groupId>org.springframework.graphql</groupId>
    <artifactId>spring-graphql-test</artifactId>
    <scope>test</scope>
  </dependency>
  <!-- Unless already present in the compile scope -->
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-webflux</artifactId>
    <scope>test</scope>
  </dependency>
</dependencies>

Gradle

dependencies {
  testImplementation("org.springframework.graphql:spring-graphql-test")
  // Unless already present in the implementation configuration
  testImplementation("org.springframework.boot:spring-boot-starter-webflux")
}

This testing module ships the GraphQlTester. The tester is heavily used in test, so be sure to become familiar with using it. There are GraphQlTester variants and Spring Boot will auto-configure them depending on the type of tests:

the ExecutionGraphQlServiceTester performs tests on the server side, without a client nor a transport
the HttpGraphQlTester performs tests with a client that connects to a server, with or without a live server

Spring Boot helps you to test your Spring GraphQL Controllers with the @GraphQlTest annotation. @GraphQlTest auto-configures the Spring GraphQL infrastructure, without any transport nor server being involved. This limits scanned beans to @Controller, RuntimeWiringConfigurer, JsonComponent, Converter, GenericConverter, DataFetcherExceptionResolver, Instrumentation and GraphQlSourceBuilderCustomizer. Regular @Component and @ConfigurationProperties beans are not scanned when the @GraphQlTest annotation is used. @EnableConfigurationProperties can be used to include @ConfigurationProperties beans.

A list of the auto-configurations that are enabled by @GraphQlTest can be found in the appendix.

Often, @GraphQlTest is limited to a set of controllers and used in combination with the @MockBean annotation to provide mock implementations for required collaborators.

Java
Kotlin

import org.junit.jupiter.api.Test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.docs.web.graphql.runtimewiring.GreetingController;
import org.springframework.boot.test.autoconfigure.graphql.GraphQlTest;
import org.springframework.graphql.test.tester.GraphQlTester;

@GraphQlTest(GreetingController.class)
class GreetingControllerTests {

	@Autowired
	private GraphQlTester graphQlTester;

	@Test
	void shouldGreetWithSpecificName() {
		this.graphQlTester.document("{ greeting(name: \"Alice\") } ")
			.execute()
			.path("greeting")
			.entity(String.class)
			.isEqualTo("Hello, Alice!");
	}

	@Test
	void shouldGreetWithDefaultName() {
		this.graphQlTester.document("{ greeting } ")
			.execute()
			.path("greeting")
			.entity(String.class)
			.isEqualTo("Hello, Spring!");
	}

}

import org.junit.jupiter.api.Test
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.docs.web.graphql.runtimewiring.GreetingController
import org.springframework.boot.test.autoconfigure.graphql.GraphQlTest
import org.springframework.graphql.test.tester.GraphQlTester

@GraphQlTest(GreetingController::class)
internal class GreetingControllerTests {

	@Autowired
	lateinit var graphQlTester: GraphQlTester

	@Test
	fun shouldGreetWithSpecificName() {
		graphQlTester.document("{ greeting(name: \"Alice\") } ").execute().path("greeting").entity(String::class.java)
				.isEqualTo("Hello, Alice!")
	}

	@Test
	fun shouldGreetWithDefaultName() {
		graphQlTester.document("{ greeting } ").execute().path("greeting").entity(String::class.java)
				.isEqualTo("Hello, Spring!")
	}

}

@SpringBootTest tests are full integration tests and involve the entire application. When using a random or defined port, a live server is configured and an HttpGraphQlTester bean is contributed automatically so you can use it to test your server. When a MOCK environment is configured, you can also request an HttpGraphQlTester bean by annotating your test class with @AutoConfigureHttpGraphQlTester:

Java
Kotlin

import org.junit.jupiter.api.Test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.graphql.tester.AutoConfigureHttpGraphQlTester;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.graphql.test.tester.HttpGraphQlTester;

@AutoConfigureHttpGraphQlTester
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.MOCK)
class GraphQlIntegrationTests {

	@Test
	void shouldGreetWithSpecificName(@Autowired HttpGraphQlTester graphQlTester) {
		HttpGraphQlTester authenticatedTester = graphQlTester.mutate()
			.webTestClient((client) -> client.defaultHeaders((headers) -> headers.setBasicAuth("admin", "ilovespring")))
			.build();
		authenticatedTester.document("{ greeting(name: \"Alice\") } ")
			.execute()
			.path("greeting")
			.entity(String.class)
			.isEqualTo("Hello, Alice!");
	}

}

import org.junit.jupiter.api.Test
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.test.autoconfigure.graphql.tester.AutoConfigureHttpGraphQlTester
import org.springframework.boot.test.context.SpringBootTest
import org.springframework.graphql.test.tester.HttpGraphQlTester
import org.springframework.http.HttpHeaders
import org.springframework.test.web.reactive.server.WebTestClient

@AutoConfigureHttpGraphQlTester
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.MOCK)
class GraphQlIntegrationTests {

	@Test
	fun shouldGreetWithSpecificName(@Autowired graphQlTester: HttpGraphQlTester) {
		val authenticatedTester = graphQlTester.mutate()
			.webTestClient { client: WebTestClient.Builder ->
				client.defaultHeaders { headers: HttpHeaders ->
					headers.setBasicAuth("admin", "ilovespring")
				}
			}.build()
		authenticatedTester.document("{ greeting(name: \"Alice\") } ").execute()
			.path("greeting").entity(String::class.java).isEqualTo("Hello, Alice!")
	}
}