diff --git a/packages/NodeTypeResolver/src/StaticTypeMapper.php b/packages/NodeTypeResolver/src/StaticTypeMapper.php
index d88882f7b4f..d67114d5d22 100644
--- a/packages/NodeTypeResolver/src/StaticTypeMapper.php
+++ b/packages/NodeTypeResolver/src/StaticTypeMapper.php
@@ -611,7 +611,6 @@ final class StaticTypeMapper
             }
 
             // @todo improve - making many false positives now
-
             $objectType = new ObjectType($typeNode->name);
 
             return $this->objectTypeSpecifier->narrowToFullyQualifiedOrAlaisedObjectType($node, $objectType);
@@ -644,45 +643,33 @@ final class StaticTypeMapper
         }
 
         if ($typeNode instanceof GenericTypeNode) {
-            if ($typeNode->type instanceof IdentifierTypeNode) {
-                $typeName = $typeNode->type->name;
+            $genericMainType = $this->mapPHPStanPhpDocTypeNodeToPHPStanType($typeNode->type, $node);
 
-                // remove extra prefix
-                $typeName = ltrim($typeName, '\\');
+            if ($genericMainType instanceof TypeWithClassName) {
+                $mainTypeAsString = $genericMainType->getClassName();
+            } else {
+                $mainTypeAsString = $typeNode->type->name;
+            }
 
-                if (in_array($typeName, ['array', 'iterable', 'Traversable'], true)) {
-                    $genericTypes = [];
-                    foreach ($typeNode->genericTypes as $genericTypeNode) {
-                        $genericTypes[] = $this->mapPHPStanPhpDocTypeNodeToPHPStanType($genericTypeNode, $node);
-                    }
+            $genericTypes = [];
+            foreach ($typeNode->genericTypes as $genericTypeNode) {
+                $genericTypes[] = $this->mapPHPStanPhpDocTypeNodeToPHPStanType($genericTypeNode, $node);
+            }
 
-                    $genericType = $this->typeFactory->createMixedPassedOrUnionType($genericTypes);
+            // special use case for array
+            if (in_array($mainTypeAsString, ['array', 'iterable'], true)) {
+                $genericType = $this->typeFactory->createMixedPassedOrUnionType($genericTypes);
 
-                    if ($typeName === 'array') {
-                        return new ArrayType(new MixedType(), $genericType);
-                    }
-
-                    if ($typeName === 'Traversable') {
-                        return new ObjectType('Traversable');
-                    }
+                if ($mainTypeAsString === 'array') {
+                    return new ArrayType(new MixedType(), $genericType);
+                }
 
+                if ($mainTypeAsString === 'iterable') {
                     return new IterableType(new MixedType(), $genericType);
                 }
             }
 
-            $mainType = $this->mapPHPStanPhpDocTypeNodeToPHPStanType($typeNode->type, $node);
-            if ($mainType instanceof TypeWithClassName) {
-                $className = $mainType->getClassName();
-            } else {
-                throw new NotImplementedException();
-            }
-
-            $genericTypes = [];
-            foreach ($typeNode->genericTypes as $genericType) {
-                $genericTypes[] = $this->mapPHPStanPhpDocTypeNodeToPHPStanType($genericType, $node);
-            }
-
-            return new GenericObjectType($className, $genericTypes);
+            return new GenericObjectType($mainTypeAsString, $genericTypes);
         }
 
         throw new NotImplementedException(__METHOD__ . ' for ' . get_class($typeNode));
diff --git a/packages/NodeTypeResolver/tests/StaticTypeMapper/StaticTypeMapperTest.php b/packages/NodeTypeResolver/tests/StaticTypeMapper/StaticTypeMapperTest.php
new file mode 100644
index 00000000000..2c28c3f82e4
--- /dev/null
+++ b/packages/NodeTypeResolver/tests/StaticTypeMapper/StaticTypeMapperTest.php
@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\NodeTypeResolver\Tests\StaticTypeMapper;
+
+use Iterator;
+use PhpParser\Node\Scalar\String_;
+use PHPStan\PhpDocParser\Ast\Type\GenericTypeNode;
+use PHPStan\PhpDocParser\Ast\Type\IdentifierTypeNode;
+use PHPStan\PhpDocParser\Ast\Type\TypeNode;
+use PHPStan\Type\Generic\GenericObjectType;
+use PHPStan\Type\IterableType;
+use Rector\HttpKernel\RectorKernel;
+use Rector\NodeTypeResolver\StaticTypeMapper;
+use Symplify\PackageBuilder\Tests\AbstractKernelTestCase;
+
+final class StaticTypeMapperTest extends AbstractKernelTestCase
+{
+    /**
+     * @var StaticTypeMapper
+     */
+    private $staticTypeMapper;
+
+    protected function setUp(): void
+    {
+        $this->bootKernel(RectorKernel::class);
+
+        $this->staticTypeMapper = self::$container->get(StaticTypeMapper::class);
+    }
+
+    /**
+     * @dataProvider provideDataForMapPHPStanPhpDocTypeNodeToPHPStanType()
+     */
+    public function testMapPHPStanPhpDocTypeNodeToPHPStanType(TypeNode $typeNode, string $expectedType): void
+    {
+        $node = new String_('hey');
+
+        $phpStanType = $this->staticTypeMapper->mapPHPStanPhpDocTypeNodeToPHPStanType($typeNode, $node);
+
+        $this->assertInstanceOf($expectedType, $phpStanType);
+    }
+
+    public function provideDataForMapPHPStanPhpDocTypeNodeToPHPStanType(): Iterator
+    {
+        $genericTypeNode = new GenericTypeNode(new IdentifierTypeNode('Traversable'), []);
+        yield [$genericTypeNode, GenericObjectType::class];
+
+        $genericTypeNode = new GenericTypeNode(new IdentifierTypeNode('iterable'), []);
+        yield [$genericTypeNode, IterableType::class];
+    }
+}
diff --git a/phpstan.neon b/phpstan.neon
index d2ebf26553a..3036261e701 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -243,7 +243,7 @@ parameters:
 
         - '#Method Rector\\BetterPhpDocParser\\PhpDocNodeFactory\\Gedmo\\(.*?)\:\:createFromNodeAndTokens\(\) should return Rector\\BetterPhpDocParser\\PhpDocNode\\Gedmo\\(.*?)\|null but returns PHPStan\\PhpDocParser\\Ast\\PhpDoc\\PhpDocTagValueNode\|null#'
 
-
-
         - '#Access to an undefined property PhpParser\\Node\\Identifier\|PhpParser\\Node\\Name\|PhpParser\\Node\\NullableType\:\:\$type#'
         - '#Call to an undefined method PhpParser\\Node\\Identifier\|PhpParser\\Node\\Name\|PhpParser\\Node\\NullableType\:\:toString\(\)#'
+        - '#Parameter \#1 \$expected of method PHPUnit\\Framework\\Assert\:\:assertInstanceOf\(\) expects class\-string<object\>, string given#'
+        - '#Unable to resolve the template type ExpectedType in call to method PHPUnit\\Framework\\Assert\:\:assertInstanceOf\(\)#'