fix: Exclude 'self' from dependency node names and add static factory method

Author: tasuku43

src/ClassDiagramRenderer/Node/Connector/DependencyConnector.php

@@ -45,9 +45,7 @@ public static function parse(
             if ($method->returnType instanceof Name) {
                 $parts                 = $method->returnType->getParts();
                 $returnTypeName = end($parts);
-                if ($returnTypeName !== 'self') {
-                    $dependencyNodeNames[] = $returnTypeName;
-                }
+                $dependencyNodeNames[] = $returnTypeName;
             }
         }
 
@@ -61,7 +59,7 @@ public static function parse(
         }
 
         // remove duplicates
-        $dependencyNodeNames = array_unique($dependencyNodeNames);
+        $dependencyNodeNames = array_filter(array_unique($dependencyNodeNames), fn($name) => $name !== 'self');
 
         return new DependencyConnector($classDiagramNode->nodeName(), $dependencyNodeNames);
     }

tests/ClassDiagram/data/SomeClassA.php

@@ -10,4 +10,9 @@ class SomeClassA extends SomeAbstractClass
     public function __construct(private SomeClassC $someClassC, SomeClassD $someClassD, private int $int)
     {
     }
+
+    public static function getInstance(): self
+    {
+        return new self(new SomeClassC(), new SomeClassD(), 1);
+    }
 }