inst/tests/occ-exp-tests.r

In dfeehan/dhstools: Tools for analyzing Demographic and Health Surveys (DHS)

## TODO -- put tests of occurrence-exposure functions here

## test exp.in.interval

## test make.lifeline

## test events.in.interval

## test compute.occ.exp
##  -> be sure to test both cases where
##     - times are absolute
##     - times are windows before row-specific interview date
##  -> be sure to also test weights