Test default effects of stroke-dasharray.
This specifically tests the values of none and 0. This also tests an odd number of values in a dash-array attribute and in combination with an offset.
The top two lines must be solid black. The next line shows a thick black line with a thinner blue line on top; both must have the same dash pattern. The bottom two lines, one black and one blue, must render so that the gaps of one correspond to the dashes of the other.