var htx = g.hidden_ctx_;
assert.equal(2, CanvasAssertions.numLinesDrawn(htx, '#ff0000'));
assert.equal(0, CanvasAssertions.numLinesDrawn(htx, '#0000ff'));
var htx = g.hidden_ctx_;
assert.equal(2, CanvasAssertions.numLinesDrawn(htx, '#ff0000'));
assert.equal(0, CanvasAssertions.numLinesDrawn(htx, '#0000ff'));