use scope->getFile()

packages/phpstan-rules/src/Rules/MaxFileLengthRule.php

@@ -46,7 +46,14 @@ public function getNodeTypes(): array
      */
     public function process(Node $node, Scope $scope): array
     {
-        return [self::ERROR_MESSAGE];
+        $file = $scope->getFile();
+        $long = strlen($file);
+
+        if ($long < $this->maxLength) {
+            return [];
+        }
+
+        return [self::ERROR_MESSAGE, $file, $long, $this->maxLength];
     }
 
     public function getRuleDefinition(): RuleDefinition

packages/phpstan-rules/tests/Rules/MaxFileLengthRule/Fixture/ItIsVeryLongFileThatPassedMaxLengthConfig.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symplify\PHPStanRules\Tests\Rules\MaxFileLengthRule\Fixture;
+
+class ItIsVeryLongFileThatPassedMaxLengthConfig
+{
+}

packages/phpstan-rules/tests/Rules/MaxFileLengthRule/Fixture/SkipNotLong.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symplify\PHPStanRules\Tests\Rules\MaxFileLengthRule\Fixture;
+
+class SkipNotLong
+{
+}

packages/phpstan-rules/tests/Rules/MaxFileLengthRule/MaxFileLengthRuleTest.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symplify\PHPStanRules\Tests\Rules\MaxFileLengthRule;
+
+use Iterator;
+use PHPStan\Rules\Rule;
+use Symplify\PHPStanExtensions\Testing\AbstractServiceAwareRuleTestCase;
+use Symplify\PHPStanRules\Rules\MaxFileLengthRule;
+
+final class MaxFileLengthRuletest extends AbstractServiceAwareRuleTestCase
+{
+    /**
+     * @dataProvider provideData()
+     */
+    public function testRule(string $filePath, array $expectedErrorMessagesWithLines): void
+    {
+        $this->analyse([$filePath], $expectedErrorMessagesWithLines);
+    }
+
+    public function provideData(): Iterator
+    {
+        yield [__DIR__ . '/Fixture/SkipNotLong.php', []];
+        yield [__DIR__ . '/Fixture/ItIsVeryLongFileThatPassedMaxLengthConfig.php', [
+            [sprintf(MaxFileLengthRule::ERROR_MESSAGE, realpath(getcwd() . '/Fixture/ItIsVeryLongFileThatPassedMaxLengthConfig.php'), 20, 17 ), 17]
+        ]];
+    }
+
+    protected function getRule(): Rule
+    {
+        return $this->getRuleFromConfig(
+            MaxFileLengthRule::class,
+            __DIR__ . '/config/configured_rule.neon'
+        );
+    }
+}

packages/phpstan-rules/tests/Rules/MaxFileLengthRule/config/configured_rule.neon

@@ -0,0 +1,9 @@
+includes:
+    - ../../../../config/services/services.neon
+
+services:
+    -
+        class: Symplify\PHPStanRules\Rules\MaxFileLengthRule
+        tags: [phpstan.rules.rule]
+        arguments:
+            maxLength: 17