[JAVA-8703] Fix Live test to allow isolated execution

testing-modules/spring-testing-2/pom.xml

@@ -63,7 +63,7 @@
     </build>
 
     <properties>
-        <testcontainers.version>1.12.2</testcontainers.version>
+        <testcontainers.version>1.16.2</testcontainers.version>
     </properties>
 
 </project>

testing-modules/spring-testing-2/src/test/java/com/baeldung/dynamicproperties/ArticleTestFixtureLiveTest.java

@@ -4,13 +4,17 @@ import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.ActiveProfiles;
 
+import java.util.List;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 @SpringBootTest
 @ActiveProfiles("pg")
 @ExtendWith(PostgreSQLExtension.class)
+@DirtiesContext
 public class ArticleTestFixtureLiveTest {
 
     @Autowired
@@ -23,8 +27,11 @@ public class ArticleTestFixtureLiveTest {
         article.setContent("Today's applications...");
 
         articleRepository.save(article);
-        Article persisted = articleRepository.findAll().get(0);
-        assertThat(persisted.getId()).isNotNull();
+
+        List<Article> allArticles = articleRepository.findAll();
+        assertThat(allArticles).hasSize(1);
+
+        Article persisted = allArticles.get(0);
         assertThat(persisted.getTitle()).isEqualTo("A Guide to @DynamicPropertySource in Spring");
         assertThat(persisted.getContent()).isEqualTo("Today's applications...");
     }

testing-modules/spring-testing-2/src/test/java/com/baeldung/dynamicproperties/PostgreSQLExtension.java

@@ -18,14 +18,14 @@ public class PostgreSQLExtension implements BeforeAllCallback, AfterAllCallback
           .withExposedPorts(5432);
 
         postgres.start();
-        String jdbcUrl = String.format("jdbc:postgresql://localhost:%d/prop", postgres.getFirstMappedPort());
-        System.setProperty("spring.datasource.url", jdbcUrl);
-        System.setProperty("spring.datasource.username", "postgres");
-        System.setProperty("spring.datasource.password", "pass");
+
+        System.setProperty("spring.datasource.url", postgres.getJdbcUrl());
+        System.setProperty("spring.datasource.username", postgres.getUsername());
+        System.setProperty("spring.datasource.password", postgres.getPassword());
     }
 
     @Override
     public void afterAll(ExtensionContext context) {
-        postgres.stop();
+        // do nothing, Testcontainers handles container shutdown
     }
 }