Add test

Author: VincentLanglet

src/Rules/Comparison/ExpressionDependsOnThisHelper.php

@@ -3,6 +3,7 @@
 namespace PHPStan\Rules\Comparison;
 
 use PhpParser\Node\Expr;
+use function in_array;
 
 final class ExpressionDependsOnThisHelper
 {
@@ -27,7 +28,7 @@ public static function isExpressionDependentOnThis(Expr $expr): bool
 			}
 
 			$className = $expr->class->toString();
-			return \in_array($className, ['self', 'static', 'parent'], true);
+			return in_array($className, ['self', 'static', 'parent'], true);
 		}
 
 		return false;

tests/PHPStan/Rules/Arrays/InvalidKeyInArrayDimFetchRuleTest.php

@@ -144,6 +144,11 @@ public function testBug12273(): void
 		]);
 	}
 
+	public function testBug12798(): void
+	{
+		$this->analyse([__DIR__ . '/../Comparison/data/bug-12798.php'], []);
+	}
+
 	public function testBug12981(): void
 	{
 		$this->analyse([__DIR__ . '/data/bug-12981.php'], [