WebTestClient throws "No qualifying bean ... as autowire candidate" - spring-boot

Question

I currently wrote a put request I wanted to test via WebTestClient. I followed some tutorials and adapted my case to it. Testing the request results in an error:
"NOSuchBeanDefinitionException: No qualifying bean of type 'org.springframework.test.web.reactive.server.WebTestClient' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}"
I looked up some solutions on SO like this one: Cant autowire `WebTestClient` - no auto configuration but couldn't make it work, despite of the hints there.
Here is the test code:
#SpringBootTest
#AutoConfigureWebTestClient
public class DemonstratorApplicationTests {
private P4uServiceImpl p4uService = new P4uServiceImpl();
#Autowired
WebTestClient webTestClient;
#MockBean
ReqP4uAccount account;
#Test
void testPutAccount(){
ReqP4uAccount request = p4uService.buildRequest("testAccount");
this.webTestClient.put()
.uri("/account")
.contentType(MediaType.APPLICATION_JSON)
.body(request, ReqP4uAccount.class)
.exchange()
.expectStatus().isOk()
.expectBody(P4uAccount.class);
}
}
Has anyone an idea what's wrong with the test setup? Thx in advance

Answer 1

The following works:
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
#SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
#AutoConfigureWebTestClient
public class DemoApplicationTests {
#Autowired
WebTestClient webTestClient;
If you remove (webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT), it will fail.
If you look at the WebTestClientAutoConfiguration , you can see that it has
#ConditionalOnClass({ WebClient.class, WebTestClient.class }) and that could be why it wont work, unless Springboot starts up the web application context during (webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
/**
* Auto-configuration for {#link WebTestClient}.
*
* #author Stephane Nicoll
* #author Andy Wilkinson
* #since 2.0.0
*/
#Configuration(proxyBeanMethods = false)
#ConditionalOnClass({ WebClient.class, WebTestClient.class })
#AutoConfigureAfter({ CodecsAutoConfiguration.class, WebFluxAutoConfiguration.class })
#Import(WebTestClientSecurityConfiguration.class)
#EnableConfigurationProperties
public class WebTestClientAutoConfiguration {