[aklug] bash assert function?

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Hey guys, my bash is a bit rusty, but I'm trying to use a bash script
as a unit test in one of my software packages. I want to make a little
"assert" function like so:

code:
- --------
# Params:
# 1) LINENO
# ...) expression to test
function assert
{
    [ $# -gt 1 ] || die "assert requires at least two parameters"
    lineno=$1
    shift 1
    if ! [ $@ ] ; then
        echo "assert test failed at line $lineno, test expression $@"
        return 1
    else
        return 0
    fi
}
- --------

The idea being to do asserts like:

code:
- --------
results=`some_test_command -f foo`
assert $LINENO "$results" = "string value" || die
- --------

However, this chokes if I try something like:

code:
- --------
assert $LINENO "a b" = "a b"
# test inside assert() chokes on having "too many arguments"
- --------

I suppose I could do the test outside of the assert function, and just
pass in the results, but that would be kind of lame because then the
assert function wouldn't be able to echo the test expression.

Any helpful thoughts?

- --
frigidcode.com
indicium.us
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Received on Wed May 23 14:21:22 2012