Align `TestRestTemplate` redirect defaults

Align redirect settings of `TestRestTemplate` with other blocking
clients and deprecate `HttpClientOption.ENABLE_REDIRECTS`. A new
`withRedirects` convenience method has also been added to quickly
allow the setting to be changed.

Closes gh-43431

spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/web/client/TestRestTemplate.java

@@ -163,8 +163,9 @@ public class TestRestTemplate {
 		if (requestFactoryBuilder instanceof HttpComponentsClientHttpRequestFactoryBuilder) {
 			builder = builder.requestFactoryBuilder(applyHttpClientOptions(
 					(HttpComponentsClientHttpRequestFactoryBuilder) requestFactoryBuilder, httpClientOptions));
-			builder = builder.redirects(HttpClientOption.ENABLE_REDIRECTS.isPresent(httpClientOptions)
-					? Redirects.FOLLOW : Redirects.DONT_FOLLOW);
+			if (HttpClientOption.ENABLE_REDIRECTS.isPresent(httpClientOptions)) {
+				builder = builder.redirects(Redirects.FOLLOW);
+			}
 		}
 		if (username != null || password != null) {
 			builder = builder.basicAuthentication(username, password);
@@ -973,6 +974,19 @@ public class TestRestTemplate {
 				this.restTemplate.getUriTemplateHandler());
 	}
 
+	/**
+	 * Creates a new {@code TestRestTemplate} with the same configuration as this one,
+	 * except that it will apply the given {@link Redirects}. The request factory used is
+	 * a new instance of the underlying {@link RestTemplate}'s request factory type (when
+	 * possible).
+	 * @param redirects the new redirect settings
+	 * @return the new template
+	 * @since 3.5.0
+	 */
+	public TestRestTemplate withRedirects(Redirects redirects) {
+		return withRequestFactorySettings((settings) -> settings.withRedirects(redirects));
+	}
+
 	/**
 	 * Creates a new {@code TestRestTemplate} with the same configuration as this one,
 	 * except that it will apply the given {@link ClientHttpRequestFactorySettings}. The
@@ -1045,7 +1059,10 @@ public class TestRestTemplate {
 
 		/**
 		 * Enable redirects.
+		 * @deprecated since 3.5.0 for removal in 4.0.0 in favor of
+		 * {@link TestRestTemplate#withRedirects(Redirects)}
 		 */
+		@Deprecated(since = "3.5.0", forRemoval = true)
 		ENABLE_REDIRECTS,
 
 		/**

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/web/client/TestRestTemplateTests.java

@@ -163,9 +163,9 @@ class TestRestTemplateTests {
 	void httpComponentsAreBuiltConsideringSettingsInRestTemplateBuilder() {
 		RestTemplateBuilder builder = new RestTemplateBuilder()
 			.requestFactoryBuilder(ClientHttpRequestFactoryBuilder.httpComponents());
-		assertThat(getRedirectStrategy((RestTemplateBuilder) null)).matches(this::isDontFollowStrategy);
+		assertThat(getRedirectStrategy((RestTemplateBuilder) null)).matches(this::isFollowStrategy);
 		assertThat(getRedirectStrategy(null, HttpClientOption.ENABLE_REDIRECTS)).matches(this::isFollowStrategy);
-		assertThat(getRedirectStrategy(builder)).matches(this::isDontFollowStrategy);
+		assertThat(getRedirectStrategy(builder)).matches(this::isFollowStrategy);
 		assertThat(getRedirectStrategy(builder, HttpClientOption.ENABLE_REDIRECTS)).matches(this::isFollowStrategy);
 		assertThat(getRedirectStrategy(builder.redirects(Redirects.DONT_FOLLOW))).matches(this::isDontFollowStrategy);
 		assertThat(getRedirectStrategy(builder.redirects(Redirects.DONT_FOLLOW), HttpClientOption.ENABLE_REDIRECTS))
@@ -175,7 +175,7 @@ class TestRestTemplateTests {
 	@Test
 	void withRequestFactorySettingsRedirectsForHttpComponents() {
 		TestRestTemplate template = new TestRestTemplate();
-		assertThat(getRedirectStrategy(template)).matches(this::isDontFollowStrategy);
+		assertThat(getRedirectStrategy(template)).matches(this::isFollowStrategy);
 		assertThat(getRedirectStrategy(template
 			.withRequestFactorySettings(ClientHttpRequestFactorySettings.defaults().withRedirects(Redirects.FOLLOW))))
 			.matches(this::isFollowStrategy);
@@ -184,6 +184,15 @@ class TestRestTemplateTests {
 			.matches(this::isDontFollowStrategy);
 	}
 
+	@Test
+	void withRedirects() {
+		TestRestTemplate template = new TestRestTemplate();
+		assertThat(getRedirectStrategy(template)).matches(this::isFollowStrategy);
+		assertThat(getRedirectStrategy(template.withRedirects(Redirects.FOLLOW))).matches(this::isFollowStrategy);
+		assertThat(getRedirectStrategy(template.withRedirects(Redirects.DONT_FOLLOW)))
+			.matches(this::isDontFollowStrategy);
+	}
+
 	@Test
 	void withRequestFactorySettingsRedirectsForJdk() {
 		TestRestTemplate template = new TestRestTemplate(