1 files changed, 58 insertions, 0 deletions
diff --git a/test-dnsdistbackoff.cc b/test-dnsdistbackoff.cc
new file mode 100644
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--- /dev/null
+++ b/test-dnsdistbackoff.cc
@@ -0,0 +1,58 @@
+/*
+ * This file is part of PowerDNS or dnsdist.
+ * Copyright -- PowerDNS.COM B.V. and its contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * In addition, for the avoidance of any doubt, permission is granted to
+ * link this program with OpenSSL and to (re)distribute the binaries
+ * produced as the result of such linking.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define BOOST_TEST_DYN_LINK
+#define BOOST_TEST_NO_MAIN
+
+#include <boost/test/unit_test.hpp>
+
+#include "dnsdist-backoff.hh"
+
+BOOST_AUTO_TEST_SUITE(dnsdistbackoff)
+
+BOOST_AUTO_TEST_CASE(test_ExponentialBackOffTimer)
+{
+  const unsigned int maxBackOff = 10 * 60;
+  const ExponentialBackOffTimer ebot(maxBackOff);
+  const std::vector<std::pair<size_t, unsigned int>> testVector{
+    {0U, 1U},
+    {1U, 2U},
+    {2U, 4U},
+    {3U, 8U},
+    {4U, 16U},
+    {5U, 32U},
+    {6U, 64U},
+    {7U, 128U},
+    {8U, 256U},
+    {9U, 512U},
+    {10U, maxBackOff}};
+  for (const auto& entry : testVector) {
+    BOOST_CHECK_EQUAL(ebot.get(entry.first), entry.second);
+  }
+
+  /* the behaviour is identical after 32 but let's go to 1024 to be safe */
+  for (size_t consecutiveFailures = testVector.size(); consecutiveFailures < 1024; consecutiveFailures++) {
+    BOOST_CHECK_EQUAL(ebot.get(consecutiveFailures), maxBackOff);
+  }
+}
+
+BOOST_AUTO_TEST_SUITE_END()