[tests] add test fixture for double instanceof check

rules-tests/CodeQuality/Rector/ClassMethod/AddInstanceofAssertForNullableInstanceRector/Fixture/double_instance_order.php.inc

@@ -0,0 +1,63 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\ClassMethod\AddInstanceofAssertForNullableInstanceRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+use Rector\PHPUnit\Tests\CodeQuality\Rector\ClassMethod\AddInstanceofAssertForNullableInstanceRector\Source\SomeClassUsedInTests;
+
+final class DoubleInstanceOrder extends TestCase
+{
+    public function test(): void
+    {
+        $someObject = $this->getSomeObject();
+        $someNestedObject = $someObject->getSomeNestedObject();
+
+        $this->assertSame(123, $someNestedObject->getNumber());
+    }
+
+    private function getSomeObject(): ?SomeClassUsedInTests
+    {
+        if (mt_rand(0, 1)) {
+            return new SomeClassUsedInTests();
+        }
+
+        return null;
+    }
+}
+
+?>
+-----
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\ClassMethod\AddInstanceofAssertForNullableInstanceRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+use Rector\PHPUnit\Tests\CodeQuality\Rector\ClassMethod\AddInstanceofAssertForNullableInstanceRector\Source\SomeClassUsedInTests;
+
+final class DoubleInstanceOrder extends TestCase
+{
+    public function test(): void
+    {
+        $someObject = $this->getSomeObject();
+        $this->assertInstanceOf(\Rector\PHPUnit\Tests\CodeQuality\Rector\ClassMethod\AddInstanceofAssertForNullableInstanceRector\Source\SomeClassUsedInTests::class, $someObject);
+        $someNestedObject = $someObject->getSomeNestedObject();
+        $this->assertInstanceOf(\Rector\PHPUnit\Tests\CodeQuality\Rector\ClassMethod\AddInstanceofAssertForNullableInstanceRector\Source\SomeNestedObject::class, $someNestedObject);
+
+        $this->assertSame(123, $someNestedObject->getNumber());
+    }
+
+    private function getSomeObject(): ?SomeClassUsedInTests
+    {
+        if (mt_rand(0, 1)) {
+            return new SomeClassUsedInTests();
+        }
+
+        return null;
+    }
+}
+
+?>

rules-tests/CodeQuality/Rector/ClassMethod/AddInstanceofAssertForNullableInstanceRector/Source/SomeClassUsedInTests.php

@@ -10,4 +10,9 @@ public function getSomeMethod(): int
     {
          return 1000;
     }
+
+    public function getSomeNestedObject(): ?SomeNestedObject
+    {
+        return new SomeNestedObject();
+    }
 }

rules-tests/CodeQuality/Rector/ClassMethod/AddInstanceofAssertForNullableInstanceRector/Source/SomeNestedObject.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\ClassMethod\AddInstanceofAssertForNullableInstanceRector\Source;
+
+final class SomeNestedObject
+{
+    public function getNumber(): int
+    {
+        return 456;
+    }
+}