Implementation of the square root in scala

square_root.scala

import org.scalatest.wordspec.AnyWordSpec

import scala.math.*

class test_different_samples extends AnyWordSpec {
  /**Calculates square root of x*/
  def square_root(x: Double, precision: Double = 0.01): Double = {
    require(x >= 0)
    def inner(min: Double, max: Double): Double = {
      val guess = (min + max) / 2
      if (abs(guess * guess - x) / x < precision) ||(x == 0) then guess
      else {
        guess * guess - x < 0 match {
          case true  => inner(guess, max)
          case false => inner(min, guess)
        }
      }
    }
    inner(0, x)
  }

  "Iterative square root" should {
    val res = square_root(64)
    assert(res == 8)
  }

}