Feature: Simple Flash

A flash, Fl, is a brief period of light, followed by a longer period of darkness.

Scenario Outline: Flashing Period <character>

The period of a flashing characteristic is the total time of the sequence.

A flash is 1 second long, so the dark period is one second shorter than the total period.

When I request an image with the characteristic <character>

Then the first frame is <colour> for 1 second

And the next frame is transparent for <dark_period> seconds

Examples:

character	colour	dark_period
Fl W 5	white	4
Fl R 10	red	9
Fl G 4	green	3
Fl Y 8	yellow	7

Scenario: Illegal Flash

As a flash is one second, a cycle of 2 seconds or less is impossible.

When I request an image with the characteristic Fl 2

Then the request fails