<stereo-img>: Button Rendering Tests

Default Behavior (no controlslist)

Expect to see the VR button and all four flat mode buttons (left, right, wiggle, and anaglyph), with 'left' as the active mode.

controlslist="vr"

Expect to see only the VR button.

controlslist="left right wiggle"

Expect to not see the VR button, and see only the left, right, and wiggle buttons in the flat mode group.

controlslist="wiggle left right" (order insensitive)

Order insensitive, expect to not see VR, and see only the left, right, and wiggle buttons in the flat mode group.

controlslist="vr left"

Expect to see the VR button and no flat mode group, since there is only one choice available.

controlslist="vr left right wiggle anaglyph"

Expect to see the VR button and the left, right, wiggle, and anaglyph buttons in the flat mode group.