Runs file tests on a set of files. Exports one function,
validate, which takes a single multi-line string as input. Each
line of the string contains a filename plus a test to run on the file.
The test can be followed with || die to make it a fatal error if
it fails.  The default is || warn. Prepending ! to the
test reverses the sense of the test. You can group tests (e.g., -rwx);
only the first failed test of the group produces a warning. For example:
use File::CheckTree;
$warnings += validate( q{
    /vmunix            -e || die
    /bin               cd
        csh            !-ug
        sh             -ex
    /usr               -d || warn "What happened to $file?\n"
});validate returns the number of warnings issued.
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