1 files changed, 39 insertions, 0 deletions
diff --git a/src/lib/dns/tests/qid_gen_unittest.cc b/src/lib/dns/tests/qid_gen_unittest.cc
new file mode 100644
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+++ b/src/lib/dns/tests/qid_gen_unittest.cc
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+// Copyright (C) 2011-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// 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 http://mozilla.org/MPL/2.0/.
+
+/// \brief Test of QidGenerator
+///
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <dns/qid_gen.h>
+
+using namespace isc::dns;
+
+// Tests the operation of the Qid generator
+
+// Check that getInstance returns a singleton
+TEST(QidGenerator, singleton) {
+    QidGenerator& g1 = QidGenerator::getInstance();
+    QidGenerator& g2 = QidGenerator::getInstance();
+
+    EXPECT_TRUE(&g1 == &g2);
+}
+
+TEST(QidGenerator, generate) {
+    // We'll assume that cryptolink's generator is 'good enough', and won't
+    // do full statistical checking here. Let's just call it the xkcd
+    // test (http://xkcd.com/221/), and check if three consecutive
+    // generates are not all the same.
+    uint16_t one, two, three;
+    QidGenerator& gen = QidGenerator::getInstance();
+    one = gen.generateQid();
+    two = gen.generateQid();
+    three = gen.generateQid();
+    ASSERT_FALSE((one == two) && (one == three));
+}