diff --git a/lib/common/tests/lists/Makefile.am b/lib/common/tests/lists/Makefile.am
index 79c60e3d52..7281944344 100644
--- a/lib/common/tests/lists/Makefile.am
+++ b/lib/common/tests/lists/Makefile.am
@@ -1,25 +1,27 @@
 #
 # 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 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_test.la \
 	-lcmocka
 AM_CFLAGS = -DPCMK__UNIT_TESTING
 AM_LDFLAGS = $(LDFLAGS_WRAP)
 
 include $(top_srcdir)/mk/tap.mk
 
 # Add "_test" to the end of all test program names to simplify .gitignore.
 
 check_PROGRAMS = \
+	pcmk__list_of_1_test \
+	pcmk__list_of_multiple_test \
 	pcmk__subtract_lists_test
 
 TESTS = $(check_PROGRAMS)
diff --git a/lib/common/tests/lists/pcmk__list_of_1_test.c b/lib/common/tests/lists/pcmk__list_of_1_test.c
new file mode 100644
index 0000000000..916de82f59
--- /dev/null
+++ b/lib/common/tests/lists/pcmk__list_of_1_test.c
@@ -0,0 +1,53 @@
+/*
+ * 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 <crm/common/unittest_internal.h>
+
+#include <glib.h>
+
+static void
+empty_list(void **state) {
+    assert_false(pcmk__list_of_1(NULL));
+}
+
+static void
+singleton_list(void **state) {
+    GList *lst = NULL;
+
+    lst = g_list_append(lst, strdup("abc"));
+    assert_true(pcmk__list_of_1(lst));
+
+    g_list_free_full(lst, free);
+}
+
+static void
+longer_list(void **state) {
+    GList *lst = NULL;
+
+    lst = g_list_append(lst, strdup("abc"));
+    lst = g_list_append(lst, strdup("xyz"));
+    assert_false(pcmk__list_of_1(lst));
+
+    g_list_free_full(lst, free);
+}
+
+int
+main(int argc, char **argv)
+{
+    const struct CMUnitTest tests[] = {
+        cmocka_unit_test(empty_list),
+        cmocka_unit_test(singleton_list),
+        cmocka_unit_test(longer_list),
+    };
+
+    cmocka_set_message_output(CM_OUTPUT_TAP);
+    return cmocka_run_group_tests(tests, NULL, NULL);
+}
diff --git a/lib/common/tests/lists/pcmk__list_of_multiple_test.c b/lib/common/tests/lists/pcmk__list_of_multiple_test.c
new file mode 100644
index 0000000000..cc78dac38b
--- /dev/null
+++ b/lib/common/tests/lists/pcmk__list_of_multiple_test.c
@@ -0,0 +1,53 @@
+/*
+ * 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 <crm/common/unittest_internal.h>
+
+#include <glib.h>
+
+static void
+empty_list(void **state) {
+    assert_false(pcmk__list_of_multiple(NULL));
+}
+
+static void
+singleton_list(void **state) {
+    GList *lst = NULL;
+
+    lst = g_list_append(lst, strdup("abc"));
+    assert_false(pcmk__list_of_multiple(lst));
+
+    g_list_free_full(lst, free);
+}
+
+static void
+longer_list(void **state) {
+    GList *lst = NULL;
+
+    lst = g_list_append(lst, strdup("abc"));
+    lst = g_list_append(lst, strdup("xyz"));
+    assert_true(pcmk__list_of_multiple(lst));
+
+    g_list_free_full(lst, free);
+}
+
+int
+main(int argc, char **argv)
+{
+    const struct CMUnitTest tests[] = {
+        cmocka_unit_test(empty_list),
+        cmocka_unit_test(singleton_list),
+        cmocka_unit_test(longer_list),
+    };
+
+    cmocka_set_message_output(CM_OUTPUT_TAP);
+    return cmocka_run_group_tests(tests, NULL, NULL);
+}