Litipk\BigNumbers\DecimalConstants::pi PHP Method

    public static function pi()
    {
        if (self::$PI === null) {
            self::$PI = Decimal::fromString("3.14159265358979323846264338327950");
        }
        return self::$PI;
    }

 public function testFiniteAbs()
 {
     $this->assertTrue(DecimalConstants::pi()->equals(Decimal::fromString("3.14159265358979323846264338327950")));
     $this->assertTrue(DecimalConstants::eulerMascheroni()->equals(Decimal::fromString("0.57721566490153286060651209008240")));
     $this->assertTrue(DecimalConstants::goldenRatio()->equals(Decimal::fromString("1.61803398874989484820458683436564")));
     $this->assertTrue(DecimalConstants::lightSpeed()->equals(Decimal::fromInteger(299792458)));
 }