text: import numpy as np
  from mandlebrot import mandelbrot
  
  def test_mandelbrot_zero_outside():
      # The Mandelbrot set should be zero outside the "active" area
      x = np.linspace(1.5, 2.0, 10)
      y = np.linspace(1.5, 2.0, 10)
      output = mandelbrot(x, y, 100, False)
      assert np.all(output == 0.0)