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diff --git a/lib/common/tests/strings/Makefile.am b/lib/common/tests/strings/Makefile.am
index 7fb9ae71fc..3d8c26fd47 100644
--- a/lib/common/tests/strings/Makefile.am
+++ b/lib/common/tests/strings/Makefile.am
@@ -1,34 +1,35 @@
#
# 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
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 = \
crm_get_msec_test \
crm_is_true_test \
crm_str_to_boolean_test \
pcmk__add_word_test \
pcmk__btoa_test \
pcmk__char_in_any_str_test \
pcmk__ends_with_test \
+ pcmk__numeric_strcasecmp_test \
pcmk__parse_ll_range_test \
pcmk__scan_double_test \
pcmk__scan_min_int_test \
pcmk__scan_port_test \
pcmk__starts_with_test \
pcmk__str_any_of_test \
pcmk__str_in_list_test \
pcmk__strcmp_test \
pcmk__trim_test
TESTS = $(check_PROGRAMS)
diff --git a/lib/common/tests/strings/pcmk__numeric_strcasecmp_test.c b/lib/common/tests/strings/pcmk__numeric_strcasecmp_test.c
new file mode 100644
index 0000000000..4ead552563
--- /dev/null
+++ b/lib/common/tests/strings/pcmk__numeric_strcasecmp_test.c
@@ -0,0 +1,82 @@
+/*
+ * 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
+no_numbers(void **state)
+{
+ /* All comparisons are done case-insensitively. */
+ assert_int_equal(pcmk__numeric_strcasecmp("abcd", "efgh"), -1);
+ assert_int_equal(pcmk__numeric_strcasecmp("abcd", "abcd"), 0);
+ assert_int_equal(pcmk__numeric_strcasecmp("efgh", "abcd"), 1);
+
+ assert_int_equal(pcmk__numeric_strcasecmp("AbCd", "eFgH"), -1);
+ assert_int_equal(pcmk__numeric_strcasecmp("ABCD", "abcd"), 0);
+ assert_int_equal(pcmk__numeric_strcasecmp("EFgh", "ABcd"), 1);
+}
+
+static void
+trailing_numbers(void **state)
+{
+ assert_int_equal(pcmk__numeric_strcasecmp("node1", "node2"), -1);
+ assert_int_equal(pcmk__numeric_strcasecmp("node1", "node1"), 0);
+ assert_int_equal(pcmk__numeric_strcasecmp("node2", "node1"), 1);
+
+ assert_int_equal(pcmk__numeric_strcasecmp("node1", "node10"), -1);
+ assert_int_equal(pcmk__numeric_strcasecmp("node10", "node10"), 0);
+ assert_int_equal(pcmk__numeric_strcasecmp("node10", "node1"), 1);
+
+ assert_int_equal(pcmk__numeric_strcasecmp("node10", "remotenode9"), -1);
+ assert_int_equal(pcmk__numeric_strcasecmp("remotenode9", "node10"), 1);
+
+ /* Longer numbers sort higher than shorter numbers. */
+ assert_int_equal(pcmk__numeric_strcasecmp("node001", "node1"), 1);
+ assert_int_equal(pcmk__numeric_strcasecmp("node1", "node001"), -1);
+}
+
+static void
+middle_numbers(void **state)
+{
+ assert_int_equal(pcmk__numeric_strcasecmp("node1abc", "node1def"), -1);
+ assert_int_equal(pcmk__numeric_strcasecmp("node1def", "node1abc"), 1);
+
+ assert_int_equal(pcmk__numeric_strcasecmp("node1abc", "node2abc"), -1);
+ assert_int_equal(pcmk__numeric_strcasecmp("node2abc", "node1abc"), 1);
+}
+
+static void
+unequal_lengths(void **state)
+{
+ assert_int_equal(pcmk__numeric_strcasecmp("node-ab", "node-abc"), -1);
+ assert_int_equal(pcmk__numeric_strcasecmp("node-abc", "node-ab"), 1);
+
+ assert_int_equal(pcmk__numeric_strcasecmp("node1ab", "node1abc"), -1);
+ assert_int_equal(pcmk__numeric_strcasecmp("node1abc", "node1ab"), 1);
+}
+
+int
+main(int argc, char **argv)
+{
+ const struct CMUnitTest tests[] = {
+ cmocka_unit_test(no_numbers),
+ cmocka_unit_test(trailing_numbers),
+ cmocka_unit_test(middle_numbers),
+ cmocka_unit_test(unequal_lengths),
+ };
+
+ cmocka_set_message_output(CM_OUTPUT_TAP);
+ return cmocka_run_group_tests(tests, NULL, NULL);
+}

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