diff --git a/rules/solid/tests/Rector/ClassMethod/ChangeReadOnlyVariableWithDefaultValueToConstantRector/Fixture/skip_test_variable_test.php.inc b/rules/solid/tests/Rector/ClassMethod/ChangeReadOnlyVariableWithDefaultValueToConstantRector/Fixture/skip_test_variable_test.php.inc
new file mode 100644
index 000000000000..376a3f804829
--- /dev/null
+++ b/rules/solid/tests/Rector/ClassMethod/ChangeReadOnlyVariableWithDefaultValueToConstantRector/Fixture/skip_test_variable_test.php.inc
@@ -0,0 +1,16 @@
+<?php
+
+namespace Rector\SOLID\Tests\Rector\ClassMethod\ChangeReadOnlyVariableWithDefaultValueToConstantRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+
+class SkipTestVariableTest extends TestCase
+{
+    public function test()
+    {
+        $expectedValue = 1;
+        $result = random(1, 5);
+
+        $this->assertSame($expectedValue, $result);
+    }
+}
diff --git a/src/PhpParser/Node/Manipulator/VariableManipulator.php b/src/PhpParser/Node/Manipulator/VariableManipulator.php
index b51f79b64102..c70e5e598365 100644
--- a/src/PhpParser/Node/Manipulator/VariableManipulator.php
+++ b/src/PhpParser/Node/Manipulator/VariableManipulator.php
@@ -4,6 +4,7 @@
 
 namespace Rector\Core\PhpParser\Node\Manipulator;
 
+use Nette\Utils\Strings;
 use PhpParser\Node;
 use PhpParser\Node\Expr\Array_;
 use PhpParser\Node\Expr\Assign;
@@ -13,6 +14,7 @@
 use Rector\Core\PhpParser\Node\BetterNodeFinder;
 use Rector\Core\PhpParser\NodeTraverser\CallableNodeTraverser;
 use Rector\Core\PhpParser\Printer\BetterStandardPrinter;
+use Rector\NodeNameResolver\NodeNameResolver;
 use Rector\NodeTypeResolver\Node\AttributeKey;
 
 final class VariableManipulator
@@ -42,18 +44,25 @@ final class VariableManipulator
      */
     private $arrayManipulator;
 
+    /**
+     * @var NodeNameResolver
+     */
+    private $nodeNameResolver;
+
     public function __construct(
         CallableNodeTraverser $callableNodeTraverser,
         AssignManipulator $assignManipulator,
         BetterStandardPrinter $betterStandardPrinter,
         BetterNodeFinder $betterNodeFinder,
-        ArrayManipulator $arrayManipulator
+        ArrayManipulator $arrayManipulator,
+        NodeNameResolver $nodeNameResolver
     ) {
         $this->callableNodeTraverser = $callableNodeTraverser;
         $this->assignManipulator = $assignManipulator;
         $this->betterStandardPrinter = $betterStandardPrinter;
         $this->betterNodeFinder = $betterNodeFinder;
         $this->arrayManipulator = $arrayManipulator;
+        $this->nodeNameResolver = $nodeNameResolver;
     }
 
     /**
@@ -82,6 +91,10 @@ public function collectScalarOrArrayAssignsOfVariable(ClassMethod $classMethod):
                 return null;
             }
 
+            if ($this->isTestCaseExpectedVariable($node->var)) {
+                return null;
+            }
+
             $assignsOfArrayToVariable[] = $node;
         });
 
@@ -135,4 +148,15 @@ private function isReadOnlyVariable(ClassMethod $classMethod, Variable $variable
 
         return true;
     }
+
+    private function isTestCaseExpectedVariable(Variable $variable): bool
+    {
+        /** @var string $className */
+        $className = $variable->getAttribute(AttributeKey::CLASS_NAME);
+        if (! Strings::endsWith($className, 'Test')) {
+            return false;
+        }
+
+        return $this->nodeNameResolver->isName($variable, 'expect*');
+    }
 }