diff --git a/test/number_format_test.dart b/test/number_format_test.dart
new file mode 100644
index 00000000..2d23c857
--- /dev/null
+++ b/test/number_format_test.dart
@@ -0,0 +1,12 @@
+import 'package:intl/intl.dart';
+import 'package:test/test.dart';
+
+void main() {
+  test('numberOfIntegerDigits calculation', () {
+    int n = 1;
+    for (var i = 1; i < 20; i++) {
+      expect(i, NumberFormat.numberOfIntegerDigits(n));
+      n *= 10;
+    }
+  });
+}