code: def test_sphere_increasing():
      # Arrange
      middle = 0.5
      pos = 0.75
  
      # Act
      ret = GimpGradientFile.sphere_increasing(middle, pos)
  
      # Assert
      assert round(abs(ret - 0.9682458365518543), 7) == 0
  
file_path: pillow-simd/Tests/test_file_gimpgradient.py
imports: from PIL import GimpGradientFile, ImagePalette
label_desc: Use image node_id 7 for calling a global function with example usage: test_sphere_increasing() without return types