Fixed the new validators and updated the tests

Author: moazelsawaf

lib/src/form_builder_validators.dart

@@ -184,10 +184,10 @@ class FormBuilderValidators {
       int valueWordsCount = 0;
 
       if (valueCandidate != null) {
-        if (valueCandidate.isEmpty) {
+        if (valueCandidate.trim().isEmpty) {
           valueWordsCount = 0;
         } else {
-          valueWordsCount = valueCandidate.split(' ').length;
+          valueWordsCount = valueCandidate.trim().split(' ').length;
         }
       }
 
@@ -206,7 +206,7 @@ class FormBuilderValidators {
   }) {
     assert(maxCount > 0);
     return (valueCandidate) {
-      int valueWordsCount = valueCandidate?.split(' ').length ?? 0;
+      int valueWordsCount = valueCandidate?.trim().split(' ').length ?? 0;
       return null != valueCandidate && valueWordsCount > maxCount
           ? errorText ??
               FormBuilderLocalizations.current.maxWordsCountErrorText(maxCount)

test/form_builder_validators_test.dart

@@ -217,6 +217,18 @@ void main() {
             expect(validator(''), isNull);
             expect(validator('the quick brown'), isNull);
             expect(validator('The quick brown fox jumps'), isNull);
+            // 1 White spaces to test the trimming of the string
+            expect(validator(' '), isNull);
+            // 5 White spaces to test the trimming of the string
+            expect(validator('     '), isNull);
+            // + 1 White space to test the trimming of the string
+            expect(validator(' The quick brown fox'), isNull);
+            // + 1 White space to test the trimming of the string
+            expect(validator('The quick brown fox '), isNull);
+            // + 1 White space to test the trimming of the string
+            expect(validator(' The quick brown fox jumps'), isNull);
+            // + 1 White space to test the trimming of the string
+            expect(validator('The quick brown fox jumps '), isNull);
             // Fail
             expect(validator('The quick brown fox jumps over'), isNotNull);
             expect(validator('The quick brown fox jumps over the lazy dog'),
@@ -236,6 +248,14 @@ void main() {
             expect(validator(null), isNotNull);
             expect(validator(''), isNotNull);
             expect(validator('The quick brown'), isNotNull);
+            // 1 White spaces to test the trimming of the string
+            expect(validator(' '), isNotNull);
+            // 5 White spaces to test the trimming of the string
+            expect(validator('     '), isNotNull);
+            // + 1 White space to test the trimming of the string
+            expect(validator(' The quick brown fox'), isNotNull);
+            // + 1 White space to test the trimming of the string
+            expect(validator('The quick brown fox '), isNotNull);
             // Advanced
             final validatorAllowEmpty =
                 FormBuilderValidators.minWordsCount(5, allowEmpty: true);