diff --git a/src/test/java/database/DatabaseConnectionTest.java b/src/test/java/database/DatabaseConnectionTest.java
index 7c31420..da813a5 100644
--- a/src/test/java/database/DatabaseConnectionTest.java
+++ b/src/test/java/database/DatabaseConnectionTest.java
@@ -1,32 +1,58 @@
 package database;
 
 import org.junit.jupiter.api.Test;
+
 import java.sql.Connection;
 import java.sql.SQLException;
+
 import static org.junit.jupiter.api.Assertions.*;
 
 class DatabaseConnectionTest {
 
     @Test
-    void testConnectionIsValid() {
-        // Test de base : la connexion ne doit pas être nulle
-        try {
-            Connection connection = DatabaseConnection.getConnection();
-            assertNotNull(connection, "La connexion ne doit pas être nulle");
+    void testGetConnectionSuccess() {
+        try (Connection connection = DatabaseConnection.getConnection()) {
+            assertNotNull(connection, "Connection should not be null.");
+            assertTrue(connection.isValid(2), "Connection should be valid.");
         } catch (SQLException e) {
-            fail("La connexion a échoué avec une exception : " + e.getMessage());
+            fail("SQLException should not occur for valid connection details.");
         }
     }
 
     @Test
-    void testConnectionIsClosedAfterUse() {
-        // Test si la connexion est fermée correctement après utilisation
-    
+    void testInvalidCredentials() {
+        String originalUser = DatabaseConnection.USER;
+        String originalPassword = DatabaseConnection.PASSWORD;
+
+        try {
+            // Temporarily set invalid credentials
+            DatabaseConnection.USER = "invalid_user";
+            DatabaseConnection.PASSWORD = "invalid_password";
+
+            SQLException exception = assertThrows(SQLException.class, DatabaseConnection::getConnection, "Expected SQLException due to invalid credentials.");
+            assertNotNull(exception.getMessage(), "Exception message should not be null for invalid credentials.");
+
+        } finally {
+            // Restore original credentials
+            DatabaseConnection.USER = originalUser;
+            DatabaseConnection.PASSWORD = originalPassword;
+        }
     }
 
     @Test
-    void testInvalidConnectionHandling() {
-        // Simule un scénario où la connexion échoue (par exemple, mauvaise configuration)
-      
+    void testConnectionFailureWithInvalidUrl() {
+        String originalUrl = DatabaseConnection.URL;
+
+        try {
+            // Temporarily set an invalid URL
+            DatabaseConnection.URL = "jdbc:mysql://invalid_url:3306/test_db";
+
+            SQLException exception = assertThrows(SQLException.class, DatabaseConnection::getConnection, "Expected SQLException due to invalid URL.");
+            assertNotNull(exception.getMessage(), "Exception message should not be null for invalid URL.");
+
+        } finally {
+            // Restore the original URL
+            DatabaseConnection.URL = originalUrl;
+        }
     }
 }