1 files changed, 55 insertions, 0 deletions
diff --git a/t/buildsystems/05-load-build-system.t b/t/buildsystems/05-load-build-system.t
new file mode 100755
index 0000000..23aed9f
--- /dev/null
+++ b/t/buildsystems/05-load-build-system.t
@@ -0,0 +1,55 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+use Cwd;
+use Test::More tests => 3;
+
+use File::Temp qw(tempdir);
+use File::Basename qw(dirname);
+use lib dirname(dirname(__FILE__));
+use Test::DH;
+use File::Path qw(remove_tree make_path);
+use Debian::Debhelper::Dh_Lib qw(!dirname);
+use Debian::Debhelper::Buildsystem;
+
+my $DIR = dirname($0);
+my $SCRIPT = './load-bs.pl'; # relative to $DIR
+my $BS_CWD = Cwd::realpath($DIR) or error("cannot resolve ${DIR}: $!");
+my $BS_CLASS = 'Debian::Debhelper::Buildsystem';
+my $bs = $BS_CLASS->new();
+my $default_builddir = $bs->DEFAULT_BUILD_DIRECTORY();
+delete($ENV{'TEST_DH_SYSTEM'});
+delete($ENV{'TEST_DH_STEP'});
+
+# NOTE: disabling parallel building explicitly (it might get automatically
+# enabled if run under dpkg-buildpackage -jX) to make output deterministic.
+is_deeply( try_load_bs(undef, 'configure', '--builddirectory=autoconf/bld dir', '--sourcedirectory',
+                       'autoconf', '--max-parallel=1'),
+    [ 'NAME=autoconf', 'builddir=autoconf/bld dir', "cwd=$BS_CWD",  'makecmd=make', 'parallel=1', 'sourcedir=autoconf' ],
+    "autoconf autoselection and sourcedir/builddir" );
+
+is_deeply( try_load_bs('autoconf', 'build', '-Sautoconf', '-D', 'autoconf', '--max-parallel=1'),
+    [ 'NAME=autoconf', 'builddir=undef', "cwd=$BS_CWD", 'makecmd=make', 'parallel=1', 'sourcedir=autoconf' ],
+    "forced autoconf and sourcedir" );
+
+is_deeply( try_load_bs('autoconf', 'build', '-B', '-Sautoconf', '--max-parallel=1'),
+    [ 'NAME=autoconf', "builddir=$default_builddir", "cwd=$BS_CWD", 'makecmd=make', 'parallel=1', 'sourcedir=.' ],
+    "forced autoconf and default build directory" );
+
+sub try_load_bs {
+    my ($system, $step, @params) = @_;
+    my @lines;
+    my $pid = open(my $fd, '-|') // die("fork: $!");
+
+    if (not $pid) {
+        chdir($DIR) or die("chdir($DIR): $!");
+        $ENV{'TEST_DH_SYSTEM'} = $system if defined($system);
+        $ENV{'TEST_DH_STEP'} = $step if defined($step);
+        exec($^X, $SCRIPT, @params);
+    }
+    @lines = map { chomp; $_ } <$fd>;
+    close($fd); # Ignore error
+    return \@lines;
+}
+