Fixup tests that rely on TestRestTemplate redirects

See gh-43431

Author: philwebb

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-oauth2-client/src/test/java/smoketest/oauth2/client/SampleOAuth2ClientApplicationTests.java

@@ -21,6 +21,7 @@
 import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.http.client.ClientHttpRequestFactorySettings.Redirects;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.web.client.TestRestTemplate;
 import org.springframework.boot.test.web.server.LocalServerPort;
@@ -42,7 +43,8 @@ class SampleOAuth2ClientApplicationTests {
 
 	@Test
 	void everythingShouldRedirectToLogin() {
-		ResponseEntity<String> entity = this.restTemplate.getForEntity("/", String.class);
+		ResponseEntity<String> entity = this.restTemplate.withRedirects(Redirects.DONT_FOLLOW)
+			.getForEntity("/", String.class);
 		assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.FOUND);
 		assertThat(entity.getHeaders().getLocation()).isEqualTo(URI.create("http://localhost:" + this.port + "/login"));
 	}