How do I run an automake program in a test suite script?

Say I have a program foo and a Makefile.am as follows:

bin_PROGRAMS = foo
foo_SOURCES = foo.c

I would like to write a test suite for foo using sh scripts, but it requires running the foo program after it is built. For example:

#!/bin/sh
./foo arg1 arg2

But this won't work if the program is configured with --program-prefix or --program-suffix because the name of the program wouldn't be foo anymore.

How can I call the program from a shell script, even if its name isn't what it normally would be?