diff --git a/tests/Number/helpers/Number.php b/tests/Number/helpers/Number.php
new file mode 100644
index 0000000..07ca222
--- /dev/null
+++ b/tests/Number/helpers/Number.php
@@ -0,0 +1,132 @@
+<?php
+
+/**
+ *
+ */
+class Number extends \Decimal\Number
+{
+    protected $value;
+
+    private static function parse($number)
+    {
+        $value = $number instanceof self ? $number->value : $number;
+
+             if ($value ===  "INF") $value =  INF;
+        else if ($value === "-INF") $value = -INF;
+        else if ($value ===  "NAN") $value =  NAN;
+
+        return $value;
+    }
+
+    protected function __construct($value)
+    {
+        $this->value = self::parse($value);
+    }
+
+    public static function valueOf($value): \Decimal\Number
+    {
+        return new static($value);
+    }
+
+    public function add($other): \Decimal\Number
+    {
+        printf("%s\n", __METHOD__);
+
+        return new static($this->value + $this->parse($other));
+    }
+
+    public function sub($other): \Decimal\Number
+    {
+        printf("%s\n", __METHOD__);
+
+        return new static($this->value - $this->parse($other));
+    }
+
+    public function mul($other): \Decimal\Number
+    {
+        printf("%s\n", __METHOD__);
+
+        return new static($this->value * $this->parse($other));
+    }
+
+    public function div($other): \Decimal\Number
+    {
+        printf("%s\n", __METHOD__);
+
+        return new static($this->value / $this->parse($other));
+    }
+
+    public function pow($other): \Decimal\Number
+    {
+        printf("%s\n", __METHOD__);
+
+        return new static($this->value ** $this->parse($other));
+    }
+
+    public function mod($other): \Decimal\Number
+    {
+        printf("%s\n", __METHOD__);
+
+        return new static($this->value % $this->parse($other));
+    }
+
+    public function shiftl($places): \Decimal\Number
+    {
+        printf("%s\n", __METHOD__);
+
+        return new static($this->value * (10 ** $places));
+    }
+
+    public function shiftr($places): \Decimal\Number
+    {
+        printf("%s\n", __METHOD__);
+
+        return new static($this->value / (10 ** $places));
+    }
+
+    public function round(int $places = NULL, int $mode = NULL): \Decimal\Number
+    {
+        return new static($this->toDecimal(\Decimal\Decimal::MAX_PRECISION)->round($places, $mode)->toString());
+    }
+
+    public function toFixed(int $places = NULL, bool $commas = NULL, int $mode = NULL): string
+    {
+        return new static($this->toDecimal(\Decimal\Decimal::MAX_PRECISION)->toFixed($places, $commas, $mode));
+    }
+
+    public function toDecimal(int $precision): \Decimal\Decimal
+    {
+        printf("%s\n", __METHOD__);
+
+        return parent::toDecimal($precision);
+    }
+
+    public function toRational(): \Decimal\Rational
+    {
+        printf("%s\n", __METHOD__);
+
+        return parent::toRational();
+    }
+
+    public function toString(): string
+    {
+        return (string) $this->value;
+    }
+
+    public function toInt(): int
+    {
+        return (int) $this->value;
+    }
+
+    public function toFloat(): float
+    {
+        return (float) $this->value;
+    }
+
+    public function compareTo($other): int
+    {
+        printf("%s\n", __METHOD__);
+
+        return $this->value <=> self::parse($other);
+    }
+}