ANSIWriter returns an io.Writer which translates any ANSI escape codes written to it into tview color tags.

unfortunately, tcell misbehaves if we try to make a new Screen for every test this function is intended for use from a `TestMain`, so that we can have a global Screen across all tests in the package.

makes a new box that tightly wraps its inner component.

makes a box that will grow to fill its canvas.

fg will be rendered on top of bg if fixed is true, it will use using fraction/1 of the height and width of the screen if fixed is false, it will use whatever `fg` asks for, up to fraction/1 of width and height.

Fills a space by repeating a string.

FixedSizeLayout fixes a component to a size.

FlexLayout lays out its sub-components.

A tail layout renders the "end" of its contents rather than the beginning when the contents overflow the box.

A tokenizer that breaks a string up by spaces.

Component renders onto a canvas.

We want our tests to be able to handle errors.