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diff --git a/lib/common/tests/scores/Makefile.am b/lib/common/tests/scores/Makefile.am
index 0e7aa87da6..395415ffee 100644
--- a/lib/common/tests/scores/Makefile.am
+++ b/lib/common/tests/scores/Makefile.am
@@ -1,21 +1,22 @@
#
# Copyright 2020-2022 the Pacemaker project contributors
#
# The version control history for this file may have further details.
#
# This source code is licensed under the GNU General Public License version 2
# or later (GPLv2+) WITHOUT ANY WARRANTY.
#
AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_builddir)/include -I$(top_srcdir)/lib/common
LDADD = $(top_builddir)/lib/common/libcrmcommon.la -lcmocka
include $(top_srcdir)/mk/tap.mk
# Add "_test" to the end of all test program names to simplify .gitignore.
check_PROGRAMS = \
char2score_test \
+ pcmk__add_scores_test \
score2char_stack_test \
score2char_test
TESTS = $(check_PROGRAMS)
diff --git a/lib/common/tests/scores/pcmk__add_scores_test.c b/lib/common/tests/scores/pcmk__add_scores_test.c
new file mode 100644
index 0000000000..bf7f0cf956
--- /dev/null
+++ b/lib/common/tests/scores/pcmk__add_scores_test.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2022 the Pacemaker project contributors
+ *
+ * The version control history for this file may have further details.
+ *
+ * This source code is licensed under the GNU Lesser General Public License
+ * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
+ */
+
+#include <crm_internal.h>
+
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <setjmp.h>
+#include <cmocka.h>
+
+static void
+score1_minus_inf(void **state)
+{
+ assert_int_equal(pcmk__add_scores(-CRM_SCORE_INFINITY, -CRM_SCORE_INFINITY), -CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(-CRM_SCORE_INFINITY, -1), -CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(-CRM_SCORE_INFINITY, 0), -CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(-CRM_SCORE_INFINITY, 1), -CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(-CRM_SCORE_INFINITY, CRM_SCORE_INFINITY), -CRM_SCORE_INFINITY);
+}
+
+static void
+score2_minus_inf(void **state)
+{
+ assert_int_equal(pcmk__add_scores(-1, -CRM_SCORE_INFINITY), -CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(0, -CRM_SCORE_INFINITY), -CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(1, -CRM_SCORE_INFINITY), -CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(CRM_SCORE_INFINITY, -CRM_SCORE_INFINITY), -CRM_SCORE_INFINITY);
+}
+
+static void
+score1_pos_inf(void **state)
+{
+ assert_int_equal(pcmk__add_scores(CRM_SCORE_INFINITY, CRM_SCORE_INFINITY), CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(CRM_SCORE_INFINITY, -1), CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(CRM_SCORE_INFINITY, 0), CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(CRM_SCORE_INFINITY, 1), CRM_SCORE_INFINITY);
+}
+
+static void
+score2_pos_inf(void **state)
+{
+ assert_int_equal(pcmk__add_scores(-1, CRM_SCORE_INFINITY), CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(0, CRM_SCORE_INFINITY), CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(1, CRM_SCORE_INFINITY), CRM_SCORE_INFINITY);
+}
+
+static void
+result_infinite(void **state)
+{
+ assert_int_equal(pcmk__add_scores(INT_MAX, INT_MAX), CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(INT_MIN, INT_MIN), -CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(2000000, 50), CRM_SCORE_INFINITY);
+ assert_int_equal(pcmk__add_scores(-4000000, 50), -CRM_SCORE_INFINITY);
+}
+
+static void
+result_finite(void **state)
+{
+ assert_int_equal(pcmk__add_scores(0, 0), 0);
+ assert_int_equal(pcmk__add_scores(0, 100), 100);
+ assert_int_equal(pcmk__add_scores(200, 0), 200);
+ assert_int_equal(pcmk__add_scores(200, -50), 150);
+}
+
+int main(int argc, char **argv)
+{
+ const struct CMUnitTest tests[] = {
+ cmocka_unit_test(score1_minus_inf),
+ cmocka_unit_test(score2_minus_inf),
+ cmocka_unit_test(score1_pos_inf),
+ cmocka_unit_test(score2_pos_inf),
+ cmocka_unit_test(result_infinite),
+ cmocka_unit_test(result_finite),
+ };
+
+ cmocka_set_message_output(CM_OUTPUT_TAP);
+ return cmocka_run_group_tests(tests, NULL, NULL);
+}

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