fixed sonarqube returned error

docker-compose.yml

@@ -20,6 +20,16 @@ services:
       - devops-net
     depends_on:
       - sonarqube
+  postgres:
+    image: postgres:16
+    environment:
+      POSTGRES_DB: petclinic
+      POSTGRES_USER: petclinic
+      POSTGRES_PASSWORD: petclinic
+    ports:
+      - "5432:5432"
+    networks:
+      - devops-net
 
   sonarqube:
     image: sonarqube:lts-community

src/test/java/org/springframework/samples/petclinic/MySqlIntegrationTests.java

@@ -60,8 +60,11 @@ class MySqlIntegrationTests {
 
 	@Test
 	void testFindAll() {
-		vets.findAll();
-		vets.findAll(); // served from cache
+		var firstCall = vets.findAll();
+		assertThat(firstCall).isNotEmpty();
+
+		var secondCall = vets.findAll(); // served from cache
+		assertThat(secondCall).hasSameSizeAs(firstCall);
 	}
 
 	@Test

src/test/java/org/springframework/samples/petclinic/PetClinicIntegrationTests.java

@@ -45,8 +45,11 @@ public class PetClinicIntegrationTests {
 
 	@Test
 	void testFindAll() {
-		vets.findAll();
-		vets.findAll(); // served from cache
+		var firstCall = vets.findAll();
+		assertThat(firstCall).isNotEmpty();
+
+		var secondCall = vets.findAll(); // served from cache
+		assertThat(secondCall).hasSameSizeAs(firstCall);
 	}
 
 	@Test

src/test/java/org/springframework/samples/petclinic/PostgresIntegrationTests.java

@@ -80,8 +80,11 @@ public class PostgresIntegrationTests {
 
 	@Test
 	void testFindAll() throws Exception {
-		vets.findAll();
-		vets.findAll(); // served from cache
+		var firstCall = vets.findAll();
+		assertThat(firstCall).isNotEmpty();
+
+		var secondCall = vets.findAll(); // served from cache
+		assertThat(secondCall).hasSameSizeAs(firstCall);
 	}
 
 	@Test