test(widgets): IbanTextFormatter + IbanInputFormatter (+9 tests)

test/widgets/iban_formatters_test.dart

@@ -0,0 +1,63 @@
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:realunit_wallet/widgets/iban_input_formatter.dart';
+import 'package:realunit_wallet/widgets/iban_text_formatter.dart';
+
+void main() {
+  group('$IbanTextFormatter.formatIban', () {
+    test('empty input returns empty string', () {
+      expect(IbanTextFormatter.formatIban(''), '');
+    });
+
+    test('uppercases lowercase characters', () {
+      expect(IbanTextFormatter.formatIban('ch93'), 'CH93');
+    });
+
+    test('strips existing spaces before regrouping', () {
+      expect(IbanTextFormatter.formatIban('CH 93 008'), 'CH93 008');
+    });
+
+    test('groups long input every four characters', () {
+      expect(
+        IbanTextFormatter.formatIban('CH9300762011623852957'),
+        'CH93 0076 2011 6238 5295 7',
+      );
+    });
+
+    test('exactly four characters: no trailing space', () {
+      expect(IbanTextFormatter.formatIban('CHFR'), 'CHFR');
+    });
+  });
+
+  group('$IbanInputFormatter.formatEditUpdate', () {
+    final formatter = IbanInputFormatter();
+
+    TextEditingValue update(String input) => formatter.formatEditUpdate(
+          TextEditingValue.empty,
+          TextEditingValue(text: input),
+        );
+
+    test('groups output in fours and uppercases', () {
+      final out = update('ch93007620116238');
+      expect(out.text, 'CH93 0076 2011 6238');
+    });
+
+    test('drops invalid characters silently', () {
+      final out = update('CH 93-0076.2011');
+      expect(out.text, 'CH93 0076 2011');
+    });
+
+    test('keeps the caret collapsed at the end of the formatted text', () {
+      final out = update('CH9300762011');
+      expect(out.text, 'CH93 0076 2011');
+      expect(out.selection, TextSelection.collapsed(offset: out.text.length));
+      expect(out.composing, TextRange.empty);
+    });
+
+    test('empty input remains empty', () {
+      final out = update('');
+      expect(out.text, '');
+      expect(out.selection.baseOffset, 0);
+    });
+  });
+}