tests: Add basic test of predicates.

[goals.git] / tests / 00-basic-predicate.gl

diff --git a/tests/00-basic-predicate.gl b/tests/00-basic-predicate.gl
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+++ b/tests/00-basic-predicate.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 of basic predicates.
+
+predicate is-cow (name) = {
+    if ! test %goals_final_check; then
+        echo %name needs transformation
+        exit 99
+    else
+        echo %name is a cow
+        exit 0
+    fi
+}
+
+predicate is-sheep (name) = {
+    echo %name is a sheep
+}
+
+goal all = : is-cow ("daisy"), is-cow ("dylan"), is-cow ("florence")
+
+goal cowofsheep (name) =
+is-cow ("%name") : is-sheep ("%name") {
+    echo transform sheep %< to cow %@
+}