#432 Run libspectrum tests with 'make check'

[Alberto Garcia]

make check builds the libspectrum tests under test/test but it should also run them. From the Automake manual:

‘make check’ causes the package’s tests to be run. This step is not mandatory, but it is often good to make sure the programs that have been built behave as they should, before you decide to install them.

Linux distributions also run make check automatically when building the packages. At the moment they are building the tests without running them.

I'm also attaching a patch for the tests that fixes a compilation warning.

[Fredrick Meunier]

Thanks, applied in [091a35].