[BAEL-6138] - Receiving Push Notifications in PostreSQL with Spring Integration (#14467)

* [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

* BAEL-6138

* [BAEL-6138] WIP - LiveTest

* [BAEL-6138] Tutorial Code

* [BAEL-6138] Tutorial Code

---------

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

spring-integration/src/test/java/com/baeldung/subflows/postgresqlnotify/PostgresqlPubSubExampleLiveTest.java

@@ -0,0 +1,40 @@
+package com.baeldung.subflows.postgresqlnotify;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.math.BigDecimal;
+import java.util.concurrent.TimeUnit;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
+
+import com.baeldung.domain.Order;
+import com.baeldung.domain.OrderType;
+import com.baeldung.subflows.postgresqlnotify.PostgresqlPubSubExample.OrdersGateway;
+
+@SpringJUnitConfig(classes = {PostgresqlPubSubExample.class})
+public class PostgresqlPubSubExampleLiveTest {
+    
+    @Autowired
+    PostgresqlPubSubExample processor;
+    
+    @Autowired
+    OrdersGateway ordersGateway;
+
+    @Test
+    void whenPublishOrder_thenSuccess() throws Exception{
+        
+        Order o = new Order(1l,"BAEL", OrderType.BUY, BigDecimal.valueOf(2.0), BigDecimal.valueOf(5.0));
+        ordersGateway.publish(o);
+        
+        assertThat(processor.awaitNextMessage(10, TimeUnit.SECONDS)).isTrue();
+        
+        BigDecimal total = processor.getTotalBySymbol("BAEL");
+        assertThat(total).isEqualTo(BigDecimal.valueOf(10));
+    }
+
+}

spring-integration/src/test/resources/database.properties

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