example.sources: Specify sources files or texts from which examples shall be...
In skranz/testexamples: Test a package by running and comparing examples

There are different sources that differ how examples are written in the file

1 2	example.sources(ex.in.fun.files = NULL, ex.files = NULL, rmd.files = NULL, ex.in.fun.text = NULL, ex.text = NULL)

`ex.in.fun.files`	Files that contain one or several examples within functions that have no argument. E.g. a function named `my.example()` whose body contains the examples.
`ex.files`	Files whose code directly specifies an examples, i.e. examples are not within functions.
`rmd.files`	Rmd files whose chunks specify examples. Chunks will be evaluated sequentially step by step. Chunks with `include=FALSE` or `eval=FALSE` will be ignored.
`ex.in.fun.text`	Similar to `ex.in.fun.files` but code will be provided as string.
`ex.text`	Similar to `ex.files` but code will be provided as string.