Merge caller JDBC Properties in JdbcDatabaseContainer#createConnection

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: singhvishalkr

modules/jdbc/src/main/java/org/testcontainers/containers/JdbcDatabaseContainer.java

@@ -263,7 +263,10 @@ public Connection createConnection(String queryString) throws SQLException, NoDr
      */
     public Connection createConnection(String queryString, Properties info)
         throws SQLException, NoDriverFoundException {
-        Properties properties = new Properties(info);
+        Properties properties = new Properties();
+        if (info != null) {
+            properties.putAll(info);
+        }
         properties.put("user", this.getUsername());
         properties.put("password", this.getPassword());
         final String url = constructUrlForConnection(queryString);

modules/jdbc/src/test/java/org/testcontainers/containers/JdbcDatabaseContainerCreateConnectionTest.java

@@ -0,0 +1,92 @@
+package org.testcontainers.containers;
+
+import lombok.NonNull;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.testcontainers.utility.DockerImageName;
+
+import java.sql.Connection;
+import java.sql.Driver;
+import java.util.Properties;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+class JdbcDatabaseContainerCreateConnectionTest {
+
+    @Test
+    void createConnectionMergesCallerInfoIntoDriverProperties() throws Exception {
+        Driver driver = mock(Driver.class);
+        Connection connection = mock(Connection.class);
+        when(driver.connect(anyString(), any(Properties.class))).thenAnswer(invocation -> {
+            Properties p = invocation.getArgument(1);
+            assertThat(p.stringPropertyNames()).contains("rewriteBatchedStatements");
+            assertThat(p.getProperty("rewriteBatchedStatements")).isEqualTo("true");
+            assertThat(p.getProperty("user")).isEqualTo("u");
+            assertThat(p.getProperty("password")).isEqualTo("secret");
+            return connection;
+        });
+
+        TestContainer container = new TestContainer(driver);
+        Properties info = new Properties();
+        info.setProperty("rewriteBatchedStatements", "true");
+
+        assertThat(container.createConnection("", info)).isSameAs(connection);
+    }
+
+    static class TestContainer extends JdbcDatabaseContainer<TestContainer> {
+
+        private final Driver testDriver;
+
+        TestContainer(Driver testDriver) {
+            super(DockerImageName.parse("mysql:5.7"));
+            this.testDriver = testDriver;
+        }
+
+        @Override
+        public String getDriverClassName() {
+            return "ignored";
+        }
+
+        @Override
+        public String getJdbcUrl() {
+            return "jdbc:mock://localhost/db";
+        }
+
+        @Override
+        public String getUsername() {
+            return "u";
+        }
+
+        @Override
+        public String getPassword() {
+            return "secret";
+        }
+
+        @Override
+        protected String getTestQueryString() {
+            return "SELECT 1";
+        }
+
+        @Override
+        public Driver getJdbcDriverInstance() {
+            return testDriver;
+        }
+
+        @Override
+        public boolean isRunning() {
+            return true;
+        }
+
+        @Override
+        protected Logger logger() {
+            return mock(Logger.class);
+        }
+
+        @Override
+        public void setDockerImageName(@NonNull String dockerImageName) {}
+    }
+}