[BAEL-6275] PostgreSQL NOTIFY/LISTEN (#14153)

* [BAEL-4849] Article code

* [BAEL-4968] Article code

* [BAEL-4968] Article code

* [BAEL-4968] Article code

* [BAEL-4968] Remove extra comments

* [BAEL-5258] Article Code

* [BAEL-2765] PKCE Support for Secret Clients

* [BAEL-5698] Article code

* [BAEL-5698] Article code

* [BAEL-5905] Initial code

* [BAEL-5905] Article code

* [BAEL-5905] Relocate article code to new module

* [BAEL-6275] PostgreSQL NOTIFY/LISTEN

* [BAEL-6275] Minor correction

---------

Co-authored-by: Philippe Sevestre <psevestre@gmail.com>

messaging-modules/postgres-notify/src/test/java/com/baeldung/messaging/postgresql/ApplicationLiveTest.java

@@ -0,0 +1,47 @@
+package com.baeldung.messaging.postgresql;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.boot.test.web.server.LocalServerPort;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.jdbc.Sql;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
+
+import com.baeldung.messaging.postgresql.domain.Order;
+
+@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
+@Sql("/schema.sql")
+class ApplicationLiveTest  {
+    
+    
+    @LocalServerPort
+    int localPort;
+    
+    @Autowired
+    TestRestTemplate client;
+    
+    @Test
+    void whenCreateBuyOrder_thenSuccess() {
+        
+        HttpHeaders headers = new HttpHeaders();
+        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
+
+        MultiValueMap<String, String> data= new LinkedMultiValueMap<>();
+        data.add("symbol", "BAEL");
+        data.add("price", "14.56");
+        data.add("quantity", "100");
+        HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<MultiValueMap<String, String>>(data, headers);
+        
+        client.postForEntity("http://localhost:" + localPort + "/orders/buy", data, Order.class);
+        
+    }
+
+}

messaging-modules/postgres-notify/src/test/resources/application.properties

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+spring.datasource.url=jdbc:postgresql://localhost:5432/baeldung
+spring.datasource.username=baeldung
+spring.datasource.password=SqD64PtsGhDXjn9f