Test linear and radial gradient defaults. Includes testing defaults for linear grad x1,y1,y2 = 0%, x2 = 100%. and testing defaults for radial grad cx,cy,r = 50%, fx,fy = cx,cy.
Run the test. No interaction required.
The top rectangle must be blue at the lefthand side and fuchsia at the right hand side, fading smoothly accross. The lower rectangle must be fuchsia at the edges with a black centre to the radial gradient at the centre of the rectangle, and the gradient occupying the whole rectangle.