add dynamic instanceof support

rules-tests/CodeQuality/Rector/MethodCall/WithCallbackIdenticalToStandaloneAssertsRector/Fixture/arrow_with_class_variable.php.inc

@@ -0,0 +1,44 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\MethodCall\WithCallbackIdenticalToStandaloneAssertsRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+
+final class ArrowWithClassVariable extends TestCase
+{
+    public function test($type)
+    {
+        $this->createMock('SomeType')
+            ->method('someMethod')
+            ->with($this->callback(
+                fn ($item): bool => $item instanceof $type &&
+                    $item->getName() === 'name'
+                ));
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\MethodCall\WithCallbackIdenticalToStandaloneAssertsRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+
+final class ArrowWithClassVariable extends TestCase
+{
+    public function test($type)
+    {
+        $this->createMock('SomeType')
+            ->method('someMethod')
+            ->with($this->callback(
+                function ($item) use ($type): bool {
+                    $this->assertInstanceOf($type, $item);
+                    $this->assertSame('name', $item->getName());
+                    return true;
+                }
+                ));
+    }
+}
+
+?>

rules/CodeQuality/NodeFactory/FromBinaryAndAssertExpressionsFactory.php

@@ -69,15 +69,16 @@ public function create(array $exprs): ?array
             }
 
             if ($expr instanceof Instanceof_) {
-                if (! $expr->class instanceof Name) {
-                    return null;
+                if ($expr->class instanceof Name) {
+                    $classNameExpr = new ClassConstFetch(new FullyQualified($expr->class->name), 'class');
+                } else {
+                    $classNameExpr = $expr->class;
                 }
 
-                $className = $expr->class->name;
                 $assertMethodCalls[] = $this->nodeFactory->createMethodCall(
                     'this',
                     'assertInstanceOf',
-                    [new ClassConstFetch(new FullyQualified($className), 'class'), $expr->expr]
+                    [$classNameExpr, $expr->expr]
                 );
 
                 continue;