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# of what tests this script would perform, which is used in the skip message.
# Calls plan skip_all, which will terminate the program.
#
# $description - Short description of the tests
#
# Returns: undef
sub skip_unless_author {
    my ($description) = @_;
    if (!$ENV{AUTHOR_TESTING}) {
        plan skip_all => "$description only run for author";
    }
    return;
}

# Skip this test unless doing automated testing or release testing.  This is
# used for tests that should be run by CPAN smoke testing or during releases,
# but not for manual installs by end users.  Takes a short description of what
# tests this script would perform, which is used in the skip message.  Calls
# plan skip_all, which will terminate the program.
#
# $description - Short description of the tests
#
# Returns: undef
sub skip_unless_automated {
    my ($description) = @_;
    for my $env (qw(AUTOMATED_TESTING RELEASE_TESTING AUTHOR_TESTING)) {
        return if $ENV{$env};
    }
    plan skip_all => "$description normally skipped";
    return;
}

# Attempt to load a module and skip the test if the module could not be
# loaded.  If the module could be loaded, call its import function manually.
# If the module could not be loaded, calls plan skip_all, which will terminate
# the program.
#
# The special logic here is based on Test::More and is required to get the
# imports to happen in the caller's namespace.
#
# $module  - Name of the module to load
# @imports - Any arguments to import, possibly including a version
#
# Returns: undef
sub use_prereq {
    my ($module, @imports) = @_;

    # If the first import looks like a version, pass it as a bare string.
    my $version = q{};
    if (@imports >= 1 && $imports[0] =~ m{ \A \d+ (?: [.][\d_]+ )* \z }xms) {
        $version = shift(@imports);
    }

    # Get caller information to put imports in the correct package.
    my ($package) = caller;

    # Do the import with eval, and try to isolate it from the surrounding
    # context as much as possible.  Based heavily on Test::More::_eval.
    ## no critic (BuiltinFunctions::ProhibitStringyEval)
    ## no critic (ValuesAndExpressions::ProhibitImplicitNewlines)
    my ($result, $error, $sigdie);
    {
        local $@            = undef;
        local $!            = undef;
        local $SIG{__DIE__} = undef;
        $result = eval qq{
            package $package;
            use $module $version \@imports;
            1;
        };
        $error = $@;
        $sigdie = $SIG{__DIE__} || undef;
    }

    # If the use failed for any reason, skip the test.
    if (!$result || $error) {
        my $name = length($version) > 0 ? "$module $version" : $module;
        plan skip_all => "$name required for test";
    }

    # If the module set $SIG{__DIE__}, we cleared that via local.  Restore it.
    ## no critic (Variables::RequireLocalizedPunctuationVars)
    if (defined($sigdie)) {
        $SIG{__DIE__} = $sigdie;
    }
    return;
}

1;
__END__

=for stopwords
Allbery Allbery's DESC bareword sublicense MERCHANTABILITY NONINFRINGEMENT
rra-c-util

=head1 NAME

Test::RRA - Support functions for Perl tests

=head1 SYNOPSIS

    use Test::RRA
      qw(skip_unless_author skip_unless_automated use_prereq);

    # Skip this test unless author tests are requested.
    skip_unless_author('Coding style tests');

    # Skip this test unless doing automated or release testing.
    skip_unless_automated('POD syntax tests');

    # Load modules, skipping the test if they're not available.
    use_prereq('Perl6::Slurp', 'slurp');
    use_prereq('Test::Script::Run', '0.04');

=head1 DESCRIPTION

This module collects utility functions that are useful for Perl test
scripts.  It assumes Russ Allbery's Perl module layout and test
conventions and will only be useful for other people if they use the
same conventions.

=head1 FUNCTIONS

None of these functions are imported by default.  The ones used by a
script should be explicitly imported.

=over 4

=item skip_unless_author(DESC)

Checks whether AUTHOR_TESTING is set in the environment and skips the
whole test (by calling C<plan skip_all> from Test::More) if it is not.
DESC is a description of the tests being skipped.  A space and C<only run
for author> will be appended to it and used as the skip reason.

=item skip_unless_automated(DESC)