implement override error msg validator

Author: ArturAssisComp

lib/new_api_prototype/core_validators/check_list_remaining_core_validators.md

@@ -0,0 +1,9 @@
+- [X] Aggregate validator (replaced by 'and' and 'or')
+- [X] Compose validator ('and' and 'or')
+- [X] Conditional validator ('validateIf' and 'skipIf')
+- [X] Log/debug validator ('debugPrint' validator)
+- [X] isEqual/isNotEqual validators 
+- [X] validate with default value validator
+- [X] Required/optional validators
+- [X] Add tests to override error msg validator
+- [ ] Transform validator

lib/new_api_prototype/core_validators/override_error_msg.dart

@@ -1,13 +1,13 @@
 import '../constants.dart';
 
-/// Replaces any inner message with [errorMsg]. It is useful for changing
-/// the message of direct validator implementations.
+/// Replaces any inner error message with [errorMsg]. It is useful for changing
+/// the error message of direct validator implementations.
 Validator<T> overrideErrorMsg<T extends Object?>(
   String errorMsg,
   Validator<T> v,
 ) {
-  return (value) {
-    final vErrorMessage = v(value);
+  return (T value) {
+    final String? vErrorMessage = v(value);
     if (vErrorMessage != null) {
       return errorMsg;
     }

test/new_api_testing/core_validators/conditional_validators/skip_if_validator_test.dart

@@ -1,6 +1,5 @@
 import 'package:flutter_test/flutter_test.dart';
 import 'package:form_builder_validators/form_builder_validators.dart';
-import 'package:form_builder_validators/new_api_prototype/core_validators/conditional_validators.dart';
 
 const String errorGt = 'error gt';
 Validator<num> gt(num target) {

test/new_api_testing/core_validators/conditional_validators/validate_if_validator_test.dart

@@ -1,6 +1,5 @@
 import 'package:flutter_test/flutter_test.dart';
 import 'package:form_builder_validators/form_builder_validators.dart';
-import 'package:form_builder_validators/new_api_prototype/core_validators/conditional_validators.dart';
 
 const String errorGt = 'error gt';
 Validator<num> gt(num target) {

test/new_api_testing/core_validators/override_error_msg_test.dart

@@ -0,0 +1,33 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:form_builder_validators/form_builder_validators.dart';
+
+void main() {
+  const String errorMsg = 'error msg';
+  String? isEvenInteger(Object? input) =>
+      input is int && input % 2 == 0 ? null : errorMsg;
+
+  group('Validator: overrideErrorMsg', () {
+    test('Should return null when the input is valid for the inner validator',
+        () {
+      const String newMsg = 'new error msg';
+      final Validator<Object?> v = overrideErrorMsg(newMsg, isEvenInteger);
+
+      // sanity check
+      expect(isEvenInteger(12), isNull);
+      // test check
+      expect(v(12), isNull);
+    });
+    test(
+        'Should return new error message when the input is not valid for the inner validator',
+        () {
+      const String newMsg = 'new error msg';
+      final Validator<Object?> v = overrideErrorMsg(newMsg, isEvenInteger);
+
+      // sanity check
+      expect(isEvenInteger(null), errorMsg);
+      // test check
+      expect(v(13), newMsg);
+      expect(v(null), newMsg);
+    });
+  });
+}