diff --git a/lib/common/tests/procfs/Makefile.am b/lib/common/tests/procfs/Makefile.am
index 414e8997d2..2bf936c9d2 100644
--- a/lib/common/tests/procfs/Makefile.am
+++ b/lib/common/tests/procfs/Makefile.am
@@ -1,21 +1,23 @@
 #
 # 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
 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__procfs_pid2path_test
+check_PROGRAMS = pcmk__procfs_has_pids_false_test	\
+		 pcmk__procfs_has_pids_true_test	\
+		 pcmk__procfs_pid2path_test
 
 TESTS = $(check_PROGRAMS)
diff --git a/lib/common/tests/procfs/pcmk__procfs_has_pids_false_test.c b/lib/common/tests/procfs/pcmk__procfs_has_pids_false_test.c
new file mode 100644
index 0000000000..888ecb1f70
--- /dev/null
+++ b/lib/common/tests/procfs/pcmk__procfs_has_pids_false_test.c
@@ -0,0 +1,51 @@
+/*
+ * 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 "mock_private.h"
+
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <setjmp.h>
+#include <cmocka.h>
+
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#if SUPPORT_PROCFS
+
+static void
+no_pids(void **state)
+{
+    // Set readlink() errno and link contents (for /proc/PID/exe)
+    pcmk__mock_readlink = true;
+    will_return(__wrap_readlink, ENOENT);
+    will_return(__wrap_readlink, NULL);
+
+    assert_false(pcmk__procfs_has_pids());
+
+    pcmk__mock_readlink = false;
+}
+
+#endif // SUPPORT_PROCFS
+
+int main(int argc, char **argv)
+{
+    const struct CMUnitTest tests[] = {
+#if SUPPORT_PROCFS
+        cmocka_unit_test(no_pids),
+#endif
+    };
+
+    cmocka_set_message_output(CM_OUTPUT_TAP);
+    return cmocka_run_group_tests(tests, NULL, NULL);
+}
diff --git a/lib/common/tests/procfs/pcmk__procfs_has_pids_true_test.c b/lib/common/tests/procfs/pcmk__procfs_has_pids_true_test.c
new file mode 100644
index 0000000000..7c61b50a10
--- /dev/null
+++ b/lib/common/tests/procfs/pcmk__procfs_has_pids_true_test.c
@@ -0,0 +1,51 @@
+/*
+ * 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 "mock_private.h"
+
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <setjmp.h>
+#include <cmocka.h>
+
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#if SUPPORT_PROCFS
+
+static void
+has_pids(void **state)
+{
+    // Set readlink() errno and link contents (for /proc/PID/exe)
+    pcmk__mock_readlink = true;
+    will_return(__wrap_readlink, 0);
+    will_return(__wrap_readlink, "/ok");
+
+    assert_true(pcmk__procfs_has_pids());
+
+    pcmk__mock_readlink = false;
+}
+
+#endif // SUPPORT_PROCFS
+
+int main(int argc, char **argv)
+{
+    const struct CMUnitTest tests[] = {
+#if SUPPORT_PROCFS
+        cmocka_unit_test(has_pids),
+#endif
+    };
+
+    cmocka_set_message_output(CM_OUTPUT_TAP);
+    return cmocka_run_group_tests(tests, NULL, NULL);
+}