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diff --git a/lib/common/tests/strings/Makefile.am b/lib/common/tests/strings/Makefile.am
index 49532d9a5b..6f3e100d5e 100644
--- a/lib/common/tests/strings/Makefile.am
+++ b/lib/common/tests/strings/Makefile.am
@@ -1,39 +1,40 @@
#
# 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__compress_test \
pcmk__ends_with_test \
pcmk__guint_from_hash_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__str_table_dup_test \
pcmk__strcmp_test \
pcmk__strkey_table_test \
pcmk__strikey_table_test \
pcmk__trim_test
TESTS = $(check_PROGRAMS)
diff --git a/lib/common/tests/strings/pcmk__compress_test.c b/lib/common/tests/strings/pcmk__compress_test.c
new file mode 100644
index 0000000000..b6e6df74ed
--- /dev/null
+++ b/lib/common/tests/strings/pcmk__compress_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 <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <setjmp.h>
+#include <cmocka.h>
+
+#define SIMPLE_DATA "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+
+const char *SIMPLE_COMPRESSED = "BZh41AY&SYO\x1ai";
+
+static void
+simple_compress(void **state)
+{
+ char *result = calloc(1024, sizeof(char));
+ unsigned int len;
+
+ assert_int_equal(pcmk__compress(SIMPLE_DATA, 40, 0, &result, &len), pcmk_rc_ok);
+ assert_memory_equal(result, SIMPLE_COMPRESSED, 13);
+}
+
+static void
+max_too_small(void **state)
+{
+ char *result = calloc(1024, sizeof(char));
+ unsigned int len;
+
+ assert_int_equal(pcmk__compress(SIMPLE_DATA, 40, 10, &result, &len), pcmk_rc_error);
+}
+
+int
+main(int argc, char **argv)
+{
+ const struct CMUnitTest tests[] = {
+ cmocka_unit_test(simple_compress),
+ cmocka_unit_test(max_too_small),
+ };
+
+ cmocka_set_message_output(CM_OUTPUT_TAP);
+ return cmocka_run_group_tests(tests, NULL, NULL);
+}

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