diff --git a/src/Generator/TypeBuilder.php b/src/Generator/TypeBuilder.php
index 523a51928..18b1983c3 100644
--- a/src/Generator/TypeBuilder.php
+++ b/src/Generator/TypeBuilder.php
@@ -49,7 +49,6 @@
 use function reset;
 use function rtrim;
 use function strtolower;
-use function substr;
 
 /**
  * Service that exposes a single method `build` called for each GraphQL
@@ -531,7 +530,7 @@ private function buildValidationRules(Validation $validationConfig): GeneratorIn
         $array = Collection::assoc();
 
         if (null !== $validationConfig->link) {
-            if (str_contains($validationConfig->link, '::')) {
+            if (!str_contains($validationConfig->link, '::')) {
                 // e.g. App\Entity\Droid
                 $array->addItem('link', $validationConfig->link);
             } else {
@@ -911,9 +910,9 @@ private function normalizeLink(string $link): array
     {
         [$fqcn, $classMember] = explode('::', $link);
 
-        if ('$' === $classMember[0]) {
+        if (str_starts_with($classMember, '$')) {
             return [$fqcn, ltrim($classMember, '$'), 'property'];
-        } elseif (')' === substr($classMember, -1)) {
+        } elseif (str_ends_with($classMember, ')')) {
             return [$fqcn, rtrim($classMember, '()'), 'getter'];
         } else {
             return [$fqcn, $classMember, 'member'];
diff --git a/tests/Functional/Validator/InputValidatorTest.php b/tests/Functional/Validator/InputValidatorTest.php
index 4af2d1ca1..58cbcd742 100644
--- a/tests/Functional/Validator/InputValidatorTest.php
+++ b/tests/Functional/Validator/InputValidatorTest.php
@@ -30,7 +30,7 @@ public function testNoValidation(): void
 
         $result = $this->executeGraphQLRequest($query);
 
-        $this->assertTrue(empty($result['errors']));
+        $this->assertArrayNotHasKey('errors', $result);
         $this->assertTrue($result['data']['noValidation']);
     }
 
@@ -47,7 +47,7 @@ public function testSimpleValidationPasses(): void
 
         $result = $this->executeGraphQLRequest($query);
 
-        $this->assertTrue(empty($result['errors']));
+        $this->assertArrayNotHasKey('errors', $result);
         $this->assertTrue($result['data']['simpleValidation']);
     }
 
@@ -82,7 +82,7 @@ public function testLinkedConstraintsValidationPasses(): void
 
         $result = $this->executeGraphQLRequest($query);
 
-        $this->assertTrue(empty($result['errors']));
+        $this->assertArrayNotHasKey('errors', $result);
         $this->assertTrue($result['data']['linkedConstraintsValidation']);
     }
 
@@ -128,7 +128,7 @@ public function testCollectionValidationPasses(): void
 
         $result = $this->executeGraphQLRequest($query);
 
-        $this->assertTrue(empty($result['errors']));
+        $this->assertArrayNotHasKey('errors', $result);
         $this->assertTrue($result['data']['collectionValidation']);
     }
 
@@ -189,7 +189,7 @@ public function testCascadeValidationWithGroupsPasses(): void
 
         $result = $this->executeGraphQLRequest($query);
 
-        $this->assertTrue(empty($result['errors']));
+        $this->assertArrayNotHasKey('errors', $result);
         $this->assertTrue($result['data']['cascadeValidationWithGroups']);
     }
 
@@ -249,7 +249,7 @@ public function testExpressionVariablesAccessible(): void
 
         $result = $this->executeGraphQLRequest($query);
 
-        $this->assertTrue(empty($result['errors']));
+        $this->assertArrayNotHasKey('errors', $result);
         $this->assertTrue($result['data']['expressionVariablesValidation']);
     }
 
@@ -266,7 +266,7 @@ public function testAutoValidationAutoThrowPasses(): void
 
         $result = $this->executeGraphQLRequest($query);
 
-        $this->assertTrue(empty($result['errors']));
+        $this->assertArrayNotHasKey('errors', $result);
         $this->assertTrue($result['data']['autoValidationAutoThrow']);
     }
 
@@ -296,7 +296,7 @@ public function testAutoValidationNoThrowNoErrors(): void
         $query = 'mutation { autoValidationNoThrow(username: "Andrew") }';
         $result = $this->executeGraphQLRequest($query);
 
-        $this->assertTrue(empty($result['errors']));
+        $this->assertArrayNotHasKey('errors', $result);
         $this->assertTrue(false === $result['data']['autoValidationNoThrow']);
     }
 
@@ -309,7 +309,7 @@ public function testAutoValidationNoThrowHasErrors(): void
         $query = 'mutation { autoValidationNoThrow(username: "Tim") }';
         $result = $this->executeGraphQLRequest($query);
 
-        $this->assertTrue(empty($result['errors']));
+        $this->assertArrayNotHasKey('errors', $result);
         $this->assertTrue(true === $result['data']['autoValidationNoThrow']);
     }
 
@@ -341,7 +341,7 @@ public function testAutoValidationAutoThrowWithGroupsPasses(): void
 
         $result = $this->executeGraphQLRequest($query);
 
-        $this->assertTrue(empty($result['errors']));
+        $this->assertArrayNotHasKey('errors', $result);
         $this->assertTrue($result['data']['autoValidationAutoThrowWithGroups']);
     }