Move RestTestClientBuilderCustomizer to spring-boot-test

Relocate `RestTestClientBuilderCustomizer` to `spring-boot-test`
and break the direct link to web-server by making use of
`spring.factories` and the new `BaseUrlProviders` class.

See gh-46356

documentation/spring-boot-docs/src/docs/antora/modules/reference/pages/testing/spring-boot-applications.adoc

@@ -189,7 +189,7 @@ include-code::MyRandomPortWebTestClientTests[]
 
 TIP: javadoc:org.springframework.test.web.reactive.server.WebTestClient[] can also used with a xref:testing/spring-boot-applications.adoc#testing.spring-boot-applications.with-mock-environment[mock environment], removing the need for a running server, by annotating your test class with javadoc:org.springframework.boot.webflux.test.autoconfigure.AutoConfigureWebTestClient[format=annotation] from `spring-boot-webflux-test`.
 
-The `spring-boot-web-server-test` modules also provides a javadoc:org.springframework.boot.web.server.test.client.TestRestTemplate[] facility:
+The `spring-boot-retclient-test` modules also provides a javadoc:org.springframework.boot.restclient.test.TestRestTemplate[] facility:
 
 include-code::MyRandomPortTestRestTemplateTests[]
 

documentation/spring-boot-docs/src/docs/antora/modules/reference/pages/testing/test-utilities.adoc

@@ -43,6 +43,8 @@ include-code::MyOutputCaptureTests[]
 == TestRestTemplate
 
 javadoc:org.springframework.boot.test.web.client.TestRestTemplate[] is a convenience alternative to Spring's javadoc:org.springframework.web.client.RestTemplate[] that is useful in integration tests.
+It's provided by the `spring-boot-restclient-test` module.
+
 You can get a vanilla template or one that sends Basic HTTP authentication (with a username and password).
 In either case, the template is fault tolerant.
 This means that it behaves in a test-friendly way by not throwing exceptions on 4xx and 5xx errors.

documentation/spring-boot-docs/src/main/java/org/springframework/boot/docs/testing/springbootapplications/withrunningserver/MyRandomPortTestRestTemplateTests.java

@@ -19,9 +19,9 @@ package org.springframework.boot.docs.testing.springbootapplications.withrunning
 import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.restclient.test.TestRestTemplate;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
-import org.springframework.boot.web.server.test.client.TestRestTemplate;
 
 import static org.assertj.core.api.Assertions.assertThat;
 

documentation/spring-boot-docs/src/main/java/org/springframework/boot/docs/testing/utilities/testresttemplate/MySpringBootTests.java

@@ -22,10 +22,10 @@ import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.restclient.RestTemplateBuilder;
+import org.springframework.boot.restclient.test.TestRestTemplate;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.boot.test.context.TestConfiguration;
-import org.springframework.boot.web.server.test.client.TestRestTemplate;
 import org.springframework.context.annotation.Bean;
 import org.springframework.http.HttpHeaders;
 

documentation/spring-boot-docs/src/main/java/org/springframework/boot/docs/testing/utilities/testresttemplate/MyTests.java

@@ -18,7 +18,7 @@ package org.springframework.boot.docs.testing.utilities.testresttemplate;
 
 import org.junit.jupiter.api.Test;
 
-import org.springframework.boot.web.server.test.client.TestRestTemplate;
+import org.springframework.boot.restclient.test.TestRestTemplate;
 import org.springframework.http.ResponseEntity;
 
 import static org.assertj.core.api.Assertions.assertThat;

documentation/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/testing/springbootapplications/withrunningserver/MyRandomPortTestRestTemplateTests.kt

@@ -19,9 +19,9 @@ package org.springframework.boot.docs.testing.springbootapplications.withrunning
 import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.Test
 import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.restclient.test.TestRestTemplate
 import org.springframework.boot.test.context.SpringBootTest
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment
-import org.springframework.boot.web.server.test.client.TestRestTemplate
 
 @SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
 class MyRandomPortTestRestTemplateTests {

documentation/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/testing/utilities/testresttemplate/MySpringBootTests.kt

@@ -22,8 +22,8 @@ import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.boot.test.context.SpringBootTest
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment
 import org.springframework.boot.test.context.TestConfiguration
-import org.springframework.boot.web.server.test.client.TestRestTemplate
 import org.springframework.boot.restclient.RestTemplateBuilder
+import org.springframework.boot.restclient.test.TestRestTemplate
 import org.springframework.context.annotation.Bean
 import java.time.Duration
 

documentation/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/testing/utilities/testresttemplate/MyTests.kt

@@ -18,7 +18,7 @@ package org.springframework.boot.docs.testing.utilities.testresttemplate
 
 import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.Test
-import org.springframework.boot.web.server.test.client.TestRestTemplate
+import org.springframework.boot.restclient.test.TestRestTemplate
 
 class MyTests {