computeWidth(str, widthMap)
without widthMap specified
should compute the width of a string
with widthMap specified
defs
should be ordered and complete
getEAW(str, at)
without at specified
should return the EAW property of the first character
should return undefined if the character is empty
with at specified
should return the EAW property of the specified character
should return undefined if the position is out of range