alphaTest property
      
      double
      get
      alphaTest
      
    
    
    
Implementation
double get alphaTest => _alphaTest;
      
      set
      alphaTest
      (double value) 
      
    
    
    
Implementation
set alphaTest(double value) {
  if ((_alphaTest > 0) != (value > 0)) {
    version++;
  }
  _alphaTest = value;
}