message: test: add error message to assertTrue
diff: @@ -39,8 +39,11 @@ import org.duckdb.DuckDBResultSetMetaData;
  public class TestDuckDBJDBC {
  private static void assertTrue(boolean val) throws Exception {
  + assertTrue(val, null);
  + }
  + private static void assertTrue(boolean val, String message) throws Exception {
  if (!val) {
  - throw new Exception();
  + throw new Exception(message);
  }
  }
  @@ -52,7 +55,7 @@ public class TestDuckDBJDBC {
  if (a == null && b == null) {
  return;
  }
  - assertTrue(a.equals(b));
  + assertTrue(a.equals(b), String.format("%s should equal %s", a, b));
  }
  private static void assertNull(Object a) throws Exception {
  