Added t2243 to test for issue #483.

test/t2243-import4.sh

@@ -0,0 +1,34 @@
+#! /bin/sh -e
+# tup - A file-based build system
+#
+# Copyright (C) 2024  Mike Shal <[email protected]>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+# Make sure importing with a default value works when the environment variable
+# is set the first time tup is called.
+
+. ./tup.sh
+
+export MARFNOEXIST=existsatstart
+cat > Tupfile << HERE
+import MARFNOEXIST=defaultval
+: |> Var is: \$(MARFNOEXIST) end |>
+HERE
+parse
+
+tup_dep_exist $ MARFNOEXIST 0 .
+tup_object_exist . 'Var is: existsatstart end'
+
+eotup