+testfileset('add string', "foo$/", ['bar'], 1, "foo$/bar$/");
+testfileset('keep string', "foo$/bar$/", ['foo'], 0, "foo$/bar$/");
+testfileset('replace string', "1$/2$/3$/", [4, 1], 2, "2$/3$/4$/");
+testfileset('replace all', $BASICBODY, ['', qr/^re/], 3, "noremove$/.$/$/");
+testfileset('keep first', "foo$/bar$/foo$/", ['foo'], 1, "foo$/bar$/");
+
+testfileset('add new array', ".$/", [['foo','.'], ''], 2, ".$/foo$/.$/");
+testfileset('replace by array', "$/foo$/.$/", [['foo',''], ''], 3, "foo$/.$/foo$/$/");
+testfileset('partial add', "foo$/$/", [['foo','.'], 'foo'], 1, "foo$/$/.$/");
+
+my $SAMPLE2 = "$/foo$/and$/bar$/.$/";
+testfileset('keep pair', $SAMPLE2, [['foo','bar']], 0, "$/foo$/and$/bar$/.$/");
+testfileset('keep order', $SAMPLE2, [['bar','foo']], 2, "$/and$/bar$/.$/foo$/");
+testfileset('replace pair', $SAMPLE2, [['fooo','barr'], ['bar','foo']], 4, "$/and$/.$/fooo$/barr$/");
+testfileset('mixed arrays', $SAMPLE2, [['bar','foo','.'],['ignore',qr/a/]], 3, "$/foo$/bar$/.$/foo$/.$/");
+
+is(remove_tree($target), 18, 'no unexpected files');