Notes on how this package can be tested.
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To run the unit tests provided by the package you can do

LC_ALL=C R --no-save <<EOT
library(igraph)
igraphtest()
EOT

Please note that some tests are disabled (= removed from the installed
package:

  1. inst/tests/test_arpack.R
     Upstream says: "an issue that has come up a couple of times so far with
        ARPACK, but I don't know how to fix it in this case, I can't seem to
        be able to reproduce it.

     So for the moment this test is disabled and the issue delayed for further
     investigation.

