Setters refactoring + Immutability (#3)

* Update project structure

* Introduce other way of setting values

* Immutability

src/DataObject.php

@@ -18,19 +18,25 @@ public static function fromArray(array $data = null): ?static
         return Hydrator::hydrate(static::class, $data);
     }
 
-    public function __call($method, $arguments): self
+    public function set(string $propertyName, mixed $value): static
     {
-        $reflectionClass = new ReflectionObject($this);
+        $clone           = clone $this;
+        $reflectionClass = new ReflectionObject($clone);
         $properties      = $reflectionClass->getProperties(ReflectionProperty::IS_PUBLIC);
 
         foreach ($properties as $property) {
             $name = $property->getName();
 
-            if (Str::camel($name) === Str::camel($method)) {
-                $property->setValue($this, ...$arguments);
+            if (Str::camel($name) === Str::camel($propertyName)) {
+                $property->setValue($clone, $value);
             }
         }
 
-        return $this;
+        return $clone;
+    }
+
+    public function __call($method, $arguments): static
+    {
+        return $this->set($method, ...$arguments);
     }
 }

tests/SimpleHydratorTest.php

@@ -134,6 +134,38 @@ public function testObjectCanSetValues()
         $this->assertSame('John', $person->first_name);
     }
 
+    public function testObjectCanSetValuesUsingSetter()
+    {
+        $person = Human::fromArray($this->data)->set('firstName', 'John');
+        $this->assertSame('John', $person->first_name);
+
+        $person = Human::fromArray($this->data)->set('FirstName', 'Dave');
+        $this->assertSame('Dave', $person->first_name);
+
+        $person = Human::fromArray($this->data)->set('First_Name', 'Pete');
+        $this->assertSame('Pete', $person->first_name);
+
+        $person = Human::fromArray($this->data)->set('First_name', 'Tony');
+        $this->assertSame('Tony', $person->first_name);
+
+        $person = Human::fromArray($this->data)->set('first_name', 'Steve');
+        $this->assertSame('Steve', $person->first_name);
+    }
+
+    public function testImmutability()
+    {
+        $person = Human::fromArray($this->data);
+        $this->assertSame('John', $person->name);
+
+        $person->set('name', 'Dave');
+        $this->assertSame('John', $person->name);
+
+        $person2 = $person->set('name', 'Dave');
+        $this->assertSame('Dave', $person2->name);
+
+        $this->assertNotSame(spl_object_id($person), spl_object_id($person2));
+    }
+
     public function testObjectTypeError()
     {
         $this->expectException(TypeError::class);