tests: Add test of the wildcard function.

diff --git a/tests/10-function-wildcard.d/a b/tests/10-function-wildcard.d/a
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diff --git a/tests/10-function-wildcard.d/a b b/tests/10-function-wildcard.d/a b
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index 0000000..e69de29

diff --git a/tests/10-function-wildcard.d/abc b/tests/10-function-wildcard.d/abc
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index 0000000..e69de29

diff --git a/tests/10-function-wildcard.expected b/tests/10-function-wildcard.expected
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--- /dev/null
+++ b/tests/10-function-wildcard.expected
@@ -0,0 +1,3 @@
+10-function-wildcard.d/a
+10-function-wildcard.d/a b
+10-function-wildcard.d/abc

diff --git a/tests/10-function-wildcard.gl b/tests/10-function-wildcard.gl
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+++ b/tests/10-function-wildcard.gl
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+# Goals test.
+# Copyright (C) 2020 Richard W.M. Jones
+# Copyright (C) 2020 Red Hat Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# 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.
+
+# Test the wildcard function.
+
+let xs = wildcard ("10-function-wildcard.d/*")
+
+goal all = { for x in %xs; do echo "$x"; done }

diff --git a/tests/10-function-wildcard.sh b/tests/10-function-wildcard.sh
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+#!/usr/bin/env bash
+# Goals test.
+# Copyright (C) 2020 Richard W.M. Jones
+# Copyright (C) 2020 Red Hat Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# 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.
+
+set -e
+
+goals -f 10-function-wildcard.gl > 10-function-wildcard.out
+diff -u 10-function-wildcard.out 10-function-wildcard.expected
+rm 10-function-wildcard.out