Fix broken assertions in tests

This commit also restores the HTTP response body
assertion that has been dropped in 5873dddc.

See gh-26162

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/reactive/server/AbstractReactiveWebServerFactoryTests.java

@@ -469,7 +469,7 @@ public abstract class AbstractReactiveWebServerFactoryTests {
 		try {
 			ContentResponse response = client.POST("http://localhost:" + this.webServer.getPort())
 					.content(new StringContentProvider("Hello World"), "text/plain").send();
-			assertThat(response.getStatus() == HttpStatus.OK.value());
+			assertThat(response.getStatus()).isEqualTo(HttpStatus.OK.value());
 			assertThat(response.getContentAsString()).isEqualTo("Hello World");
 		}
 		finally {

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/server/AbstractServletWebServerFactoryTests.java

@@ -1139,7 +1139,8 @@ public abstract class AbstractServletWebServerFactoryTests {
 		client.start();
 		try {
 			ContentResponse response = client.GET("http://localhost:" + this.webServer.getPort() + "/hello");
-			assertThat(response.getStatus() == HttpStatus.OK.value());
+			assertThat(response.getStatus()).isEqualTo(HttpStatus.OK.value());
+			assertThat(response.getContentAsString()).isEqualTo("Hello World");
 		}
 		finally {
 			client.stop();