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http-service-clients/src/test/java/com/ankurm/hsc/Step09RestClientSliceTest.java

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+package com.ankurm.hsc;
+
+import com.ankurm.hsc.client.PostClient;
+import com.ankurm.hsc.model.Post;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.restclient.test.autoconfigure.RestClientTest;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.client.MockRestServiceServer;
+import org.springframework.web.client.RestClient;
+import org.springframework.web.client.support.RestClientAdapter;
+import org.springframework.web.service.invoker.HttpServiceProxyFactory;
+import org.springframework.web.service.registry.ImportHttpServices;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.client.match.MockRestRequestMatchers.requestTo;
+import static org.springframework.test.web.client.response.MockRestResponseCreators.withSuccess;
+
+/**
+ * @RestClientTest next to an @ImportHttpServices group: what binds to the auto-configured
+ * MockRestServiceServer and what does not.
+ */
+@RestClientTest(properties = "spring.http.serviceclient.slice.base-url=http://upstream.test")
+@Import(Step09RestClientSliceTest.SliceGroups.class)
+class Step09RestClientSliceTest {
+
+    @Configuration(proxyBeanMethods = false)
+    @ImportHttpServices(group = "slice", types = PostClient.class)
+    static class SliceGroups {
+    }
+
+    @Autowired
+    RestClient.Builder builder;
+
+    @Autowired
+    MockRestServiceServer server;
+
+    private static final String JSON = "{\"id\":1,\"userId\":1,\"title\":\"From the mock\",\"body\":\"b\"}";
+
+    @Test
+    void sliceWithHttpServiceGroup() {
+        Transcript t = new Transcript("09-rest-client-test-slice.txt");
+        t.line("# a proxy built from the slice's own RestClient.Builder, which the mock server IS bound to");
+        PostClient viaBuilder = HttpServiceProxyFactory.builderFor(
+                RestClientAdapter.create(builder.baseUrl("http://upstream.test").build())).build().createClient(PostClient.class);
+        server.expect(requestTo("http://upstream.test/posts/1")).andRespond(withSuccess(JSON, MediaType.APPLICATION_JSON));
+        Post p = viaBuilder.findById(1);
+        server.verify();
+        t.line("findById(1) -> %s", p);
+        t.save();
+        assertThat(p.title()).isEqualTo("From the mock");
+    }
+}