fix(counter): readonly

domain/Counter.php

@@ -7,7 +7,7 @@
 /**
  * @template T
  */
-class Counter implements \Countable
+readonly class Counter implements \Countable
 {
     /**
      * @param T $countedObject
@@ -16,28 +16,27 @@ public function __construct(protected mixed $countedObject, protected int $count
     {
     }
 
-    public function reset(): void
+    public function reset2(): self
     {
-        $this->count = 0;
+        return new self($this->countedObject);
     }
 
     /**
      * @return self<T>
      */
-    public function decrement2(): self
+    public function decrement(): self
     {
         return new self($this->countedObject, $this->count - 1 );
     }
 
-    public function increment(): int
+    public function increment(): self
     {
-        $this->count++;
-        return $this->count;
+        return new self($this->countedObject, $this->count + 1 );
     }
 
-    public function increase(int $count): void
+    public function increase(int $count): self
     {
-        $this->count += $count;
+        return new self($this->countedObject, $this->count + $count );
     }
 
     public function count(): int

tests/cases/CounterTest.php

@@ -23,7 +23,7 @@ public function testReset(): void
         $stdClass = new \stdClass();
 
         $counter = new Counter($stdClass, 4);
-        $counter->reset();
+        $counter->reset2();
         self::assertSame(0, $counter->count());
     }
 
@@ -32,10 +32,10 @@ public function testDecrement(): void
         $stdClass = new \stdClass();
 
         $counter = new Counter($stdClass);
-        self::assertSame(-1, ($counter->decrement2())->count());
+        self::assertSame(-1, $counter->decrement()->count());
 
         $counter = new Counter($stdClass, 4);
-        self::assertSame(3, ($counter->decrement2())->count());
+        self::assertSame(3, $counter->decrement()->count());
     }
 
     public function testIncrement(): void