1 files changed, 104 insertions, 0 deletions
diff --git a/tests/isc/stats_test.c b/tests/isc/stats_test.c
new file mode 100644
index 0000000..a475323
--- /dev/null
+++ b/tests/isc/stats_test.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <inttypes.h>
+#include <sched.h> /* IWYU pragma: keep */
+#include <setjmp.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define UNIT_TESTING
+#include <cmocka.h>
+
+#include <isc/mem.h>
+#include <isc/result.h>
+#include <isc/stats.h>
+#include <isc/util.h>
+
+#include <tests/isc.h>
+
+/* test stats */
+ISC_RUN_TEST_IMPL(isc_stats_basic) {
+	isc_stats_t *stats = NULL;
+	isc_result_t result;
+
+	UNUSED(state);
+
+	result = isc_stats_create(mctx, &stats, 4);
+	assert_int_equal(result, ISC_R_SUCCESS);
+	assert_int_equal(isc_stats_ncounters(stats), 4);
+
+	/* Default all 0. */
+	for (int i = 0; i < isc_stats_ncounters(stats); i++) {
+		assert_int_equal(isc_stats_get_counter(stats, i), 0);
+	}
+
+	/* Test increment. */
+	for (int i = 0; i < isc_stats_ncounters(stats); i++) {
+		isc_stats_increment(stats, i);
+		assert_int_equal(isc_stats_get_counter(stats, i), 1);
+		isc_stats_increment(stats, i);
+		assert_int_equal(isc_stats_get_counter(stats, i), 2);
+	}
+
+	/* Test decrement. */
+	for (int i = 0; i < isc_stats_ncounters(stats); i++) {
+		isc_stats_decrement(stats, i);
+		assert_int_equal(isc_stats_get_counter(stats, i), 1);
+		isc_stats_decrement(stats, i);
+		assert_int_equal(isc_stats_get_counter(stats, i), 0);
+	}
+
+	/* Test set. */
+	for (int i = 0; i < isc_stats_ncounters(stats); i++) {
+		isc_stats_set(stats, i, i);
+		assert_int_equal(isc_stats_get_counter(stats, i), i);
+	}
+
+	/* Test update if greater. */
+	for (int i = 0; i < isc_stats_ncounters(stats); i++) {
+		isc_stats_update_if_greater(stats, i, i);
+		assert_int_equal(isc_stats_get_counter(stats, i), i);
+		isc_stats_update_if_greater(stats, i, i + 1);
+		assert_int_equal(isc_stats_get_counter(stats, i), i + 1);
+	}
+
+	/* Test resize. */
+	isc_stats_resize(&stats, 3);
+	assert_int_equal(isc_stats_ncounters(stats), 4);
+	isc_stats_resize(&stats, 4);
+	assert_int_equal(isc_stats_ncounters(stats), 4);
+	isc_stats_resize(&stats, 5);
+	assert_int_equal(isc_stats_ncounters(stats), 5);
+
+	/* Existing counters are retained */
+	for (int i = 0; i < isc_stats_ncounters(stats); i++) {
+		uint32_t expect = i + 1;
+		if (i == 4) {
+			expect = 0;
+		}
+		assert_int_equal(isc_stats_get_counter(stats, i), expect);
+	}
+
+	isc_stats_detach(&stats);
+}
+
+ISC_TEST_LIST_START
+
+ISC_TEST_ENTRY(isc_stats_basic)
+
+ISC_TEST_LIST_END
+
+ISC_TEST_MAIN