Implement getURL() for JDBC4DatabaseMetaData

bindings/java/src/test/java/org/github/tursodatabase/jdbc4/JDBC4DatabaseMetaDataTest.java

@@ -0,0 +1,28 @@
+package org.github.tursodatabase.jdbc4;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.util.Properties;
+
+import org.github.tursodatabase.TestUtils;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+class JDBC4DatabaseMetaDataTest {
+
+    private JDBC4Connection connection;
+    private JDBC4DatabaseMetaData metaData;
+
+    @BeforeEach
+    void setUp() throws Exception {
+        String filePath = TestUtils.createTempFile();
+        String url = "jdbc:sqlite:" + filePath;
+        connection = new JDBC4Connection(url, filePath, new Properties());
+        metaData = new JDBC4DatabaseMetaData(connection);
+    }
+
+    @Test
+    void getURLShouldReturnNonEmptyString() throws Exception{
+        assertFalse(metaData.getURL().isEmpty());
+    }
+}