Do not decrement min integer value (#1488)

infection · Feb 22, 2021 · c0ae499 · c0ae499
1 parent ea85f1f
commit c0ae499
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diff --git a/src/Mutator/Number/DecrementInteger.php b/src/Mutator/Number/DecrementInteger.php
@@ -40,6 +40,7 @@
 use Infection\Mutator\GetMutatorName;
 use Infection\Mutator\MutatorCategory;
 use Infection\PhpParser\Visitor\ParentConnector;
+use const PHP_INT_MIN;
 use PhpParser\Node;
 
 /**
@@ -97,6 +98,10 @@ public function canMutate(Node $node): bool
             return false;
         }
 
+        if ($node->value === PHP_INT_MIN) {
+            return false;
+        }
+
         if (
             $node->value === 1
             && ($this->isPartOfComparison($node) || ParentConnector::getParent($node) instanceof Node\Expr\Assign)

diff --git a/tests/phpunit/Mutator/Number/DecrementIntegerTest.php b/tests/phpunit/Mutator/Number/DecrementIntegerTest.php
@@ -504,6 +504,16 @@ public function mutationsProvider(): iterable
 <?php
 
 preg_split('//', 'string', -2);
+PHP
+        ];
+
+        yield 'It does not decrement min int' => [
+            <<<'PHP'
+<?php
+
+if ($a === -9223372036854775808) {
+    echo 'bar';
+}
 PHP
         ];
     }