diff --git a/src/Support/Str.php b/src/Support/Str.php
index 6e32c05d..04f4b1fd 100644
--- a/src/Support/Str.php
+++ b/src/Support/Str.php
@@ -79,7 +79,7 @@ final class Str
             return $subject;
         }
 
-        return substr($subject, 0, $pos);
+        return mb_substr($subject, 0, $pos);
     }
 
     /**
diff --git a/tests/.snapshots/SuccessOnly.php.inc b/tests/.snapshots/SuccessOnly.php.inc
index b00a0e36..b940b7b6 100644
--- a/tests/.snapshots/SuccessOnly.php.inc
+++ b/tests/.snapshots/SuccessOnly.php.inc
@@ -1,5 +1,5 @@
 ##teamcity[testSuiteStarted name='Tests/tests/SuccessOnly' locationHint='pest_qn://tests/.tests/SuccessOnly.php' flowId='1234']
-##teamcity[testCount count='3' flowId='1234']
+##teamcity[testCount count='4' flowId='1234']
 ##teamcity[testStarted name='it can pass with comparison' locationHint='pest_qn://tests/.tests/SuccessOnly.php::it can pass with comparison' flowId='1234']
 ##teamcity[testFinished name='it can pass with comparison' duration='100000' flowId='1234']
 ##teamcity[testStarted name='can also pass' locationHint='pest_qn://tests/.tests/SuccessOnly.php::can also pass' flowId='1234']
@@ -8,8 +8,12 @@
 ##teamcity[testStarted name='can pass with dataset with data set "(true)"' locationHint='pest_qn://tests/.tests/SuccessOnly.php::can pass with dataset with data set "(true)"' flowId='1234']
 ##teamcity[testFinished name='can pass with dataset with data set "(true)"' duration='100000' flowId='1234']
 ##teamcity[testSuiteFinished name='can pass with dataset' flowId='1234']
+##teamcity[testSuiteStarted name='`block` → can pass with dataset in describe block' locationHint='pest_qn://tests/.tests/SuccessOnly.php::`block` → can pass with dataset in describe block' flowId='1234']
+##teamcity[testStarted name='`block` → can pass with dataset in describe block with data set "(1)"' locationHint='pest_qn://tests/.tests/SuccessOnly.php::`block` → can pass with dataset in describe block with data set "(1)"' flowId='1234']
+##teamcity[testFinished name='`block` → can pass with dataset in describe block with data set "(1)"' duration='100000' flowId='1234']
+##teamcity[testSuiteFinished name='`block` → can pass with dataset in describe block' flowId='1234']
 ##teamcity[testSuiteFinished name='Tests/tests/SuccessOnly' flowId='1234']
 
-  Tests:    3 passed (3 assertions)
+  Tests:    4 passed (4 assertions)
   Duration: 1.00s
 
diff --git a/tests/.tests/SuccessOnly.php b/tests/.tests/SuccessOnly.php
index cb4009a6..4d231a8d 100644
--- a/tests/.tests/SuccessOnly.php
+++ b/tests/.tests/SuccessOnly.php
@@ -13,3 +13,9 @@ test('can also pass', function () {
 test('can pass with dataset', function ($value) {
     expect($value)->toEqual(true);
 })->with([true]);
+
+describe('block', function () {
+    test('can pass with dataset in describe block', function ($number) {
+        expect($number)->toBeInt();
+    })->with([1]);
+});
diff --git a/tests/Visual/JUnit.php b/tests/Visual/JUnit.php
index 3523bdd6..fd34ea7a 100644
--- a/tests/Visual/JUnit.php
+++ b/tests/Visual/JUnit.php
@@ -36,8 +36,8 @@ test('junit output', function () use ($normalizedPath, $run) {
     expect($result['testsuite']['@attributes'])
         ->name->toBe('Tests\tests\SuccessOnly')
         ->file->toBe($normalizedPath('tests/.tests/SuccessOnly.php'))
-        ->tests->toBe('3')
-        ->assertions->toBe('3')
+        ->tests->toBe('4')
+        ->assertions->toBe('4')
         ->errors->toBe('0')
         ->failures->toBe('0')
         ->skipped->toBe('0');