Add rest-test-client module: RestTestClient across all four binding modes, TestRestTemplate relocation, gzip-hiding HTTP client surprise (post #44)

2026-10-08 09:40:13 +00:00
parent 5851521420
commit 5e4d481c02
22 changed files with 795 additions and 5 deletions
@@ -0,0 +1,52 @@
+package com.ankurm.resttestclient;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.server.LocalServerPort;
+import org.springframework.http.client.JdkClientHttpRequestFactory;
+import org.springframework.http.client.SimpleClientHttpRequestFactory;
+import org.springframework.web.client.RestClient;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Not a RestTestClient test -- this is plain {@code RestClient} against the same running
+ * server, isolating exactly one variable: which {@link org.springframework.http.client.ClientHttpRequestFactory}
+ * handles the socket. It exists to prove the claim made in {@link PersonEndToEndTest}: that
+ * "bind to a real server" does not by itself guarantee you can observe real HTTP-level
+ * behavior, because the client you get by default may have already undone it for you.
+ */
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+class HttpClientChoiceComparisonTest {
+
+    @LocalServerPort
+    int port;
+
+    @Test
+    void theJdkHttpClientDecodesGzipAndHidesTheHeader() {
+        RestClient client = RestClient.builder()
+                .requestFactory(new JdkClientHttpRequestFactory())
+                .baseUrl("http://localhost:" + port)
+                .build();
+
+        Boolean hasContentEncoding = client.get().uri("/api/persons")
+                .header("Accept-Encoding", "gzip")
+                .exchange((request, response) -> response.getHeaders().get("Content-Encoding") != null);
+
+        assertThat(hasContentEncoding).isFalse();
+    }
+
+    @Test
+    void theOldHttpUrlConnectionFactoryShowsTheRealHeader() {
+        RestClient client = RestClient.builder()
+                .requestFactory(new SimpleClientHttpRequestFactory())
+                .baseUrl("http://localhost:" + port)
+                .build();
+
+        String contentEncoding = client.get().uri("/api/persons")
+                .header("Accept-Encoding", "gzip")
+                .exchange((request, response) -> response.getHeaders().getFirst("Content-Encoding"));
+
+        assertThat(contentEncoding).isEqualTo("gzip");
+    }
+}