SERVER-68477 add unit test for TTLCollectionCache

(cherry picked from commit f32f550aff1def5709ea68f42dc9d4bf9321d5e6)

2 files changed, 92 insertions, 0 deletions

diff --git a/src/mongo/db/SConscript b/src/mongo/db/SConscript
index f677e021b30..a9404ebedfa 100644
--- a/src/mongo/db/SConscript
+++ b/src/mongo/db/SConscript
@@ -2517,6 +2517,7 @@ if wiredtiger:
             'transaction/transaction_history_iterator_test.cpp',
             'transaction/transaction_participant_retryable_writes_test.cpp',
             'transaction/transaction_participant_test.cpp',
+            'ttl_collection_cache_test.cpp',
             'ttl_test.cpp',
             'update_index_data_test.cpp',
             'vector_clock_mongod_test.cpp',
@@ -2617,6 +2618,7 @@ if wiredtiger:
             'snapshot_window_options',
             'startup_warnings_mongod',
             'time_proof_service',
+            'ttl_collection_cache',
             'ttl_d',
             'update_index_data',
             'vector_clock',
diff --git a/src/mongo/db/ttl_collection_cache_test.cpp b/src/mongo/db/ttl_collection_cache_test.cpp
new file mode 100644
index 00000000000..4f598b3736c
--- /dev/null
+++ b/src/mongo/db/ttl_collection_cache_test.cpp
@@ -0,0 +1,90 @@
+/**
+ *    Copyright (C) 2022-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    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
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/db/ttl_collection_cache.h"
+#include "mongo/unittest/unittest.h"
+
+namespace mongo {
+namespace {
+
+TEST(TTLCollectionCacheTest, Basic) {
+    TTLCollectionCache cache;
+    ASSERT_EQ(cache.getTTLInfos().size(), 0);
+
+    auto uuidCollA = UUID::gen();
+    auto uuidCollB = UUID::gen();
+    auto infoIndexA1 = TTLCollectionCache::Info{"collA_ttl_1"};
+    auto infoClusteredA = TTLCollectionCache::Info{TTLCollectionCache::ClusteredId{}};
+    auto infoIndexB1 = TTLCollectionCache::Info("collB_ttl_1");
+
+    // Confirm registerTTLInfo() behavior using getTTLInfo().
+    cache.registerTTLInfo(uuidCollA, infoIndexA1);
+    cache.registerTTLInfo(uuidCollA, infoClusteredA);
+    cache.registerTTLInfo(uuidCollB, infoIndexB1);
+
+    auto infos = cache.getTTLInfos();
+    ASSERT_EQ(infos.size(), 2U);
+    ASSERT_EQ(infos.count(uuidCollA), 1U);
+    ASSERT_EQ(infos[uuidCollA].size(), 2U);
+    auto indexNameA = stdx::get_if<TTLCollectionCache::IndexName>(&infos[uuidCollA][0]);
+    ASSERT(indexNameA);
+    ASSERT_EQ(*indexNameA, "collA_ttl_1");
+    ASSERT(stdx::get_if<TTLCollectionCache::ClusteredId>(&infos[uuidCollA][1]));
+
+    ASSERT_EQ(infos.count(uuidCollB), 1U);
+    ASSERT_EQ(infos[uuidCollB].size(), 1U);
+
+    auto indexNameB = stdx::get_if<TTLCollectionCache::IndexName>(&infos[uuidCollB][0]);
+    ASSERT(indexNameB);
+    ASSERT_EQ(*indexNameB, "collB_ttl_1");
+
+    // Check deregisterTTLInfo(). TTLCollectionCache should clean up
+    // UUIDs that no longer have any TTL infos registered.
+    cache.deregisterTTLInfo(uuidCollB, infoIndexB1);
+    infos = cache.getTTLInfos();
+    ASSERT_EQ(infos.size(), 1U);
+    ASSERT_EQ(infos.count(uuidCollA), 1U);
+    ASSERT_EQ(infos[uuidCollA].size(), 2U);
+
+    // Remove info for TTL index on collection A.
+    cache.deregisterTTLInfo(uuidCollA, infoIndexA1);
+    infos = cache.getTTLInfos();
+    ASSERT_EQ(infos.size(), 1U);
+    ASSERT_EQ(infos.count(uuidCollA), 1U);
+    ASSERT_EQ(infos[uuidCollA].size(), 1U);
+    ASSERT(stdx::get_if<TTLCollectionCache::ClusteredId>(&infos[uuidCollA][0]));
+
+    // Remove clustered info for collection A.
+    cache.deregisterTTLInfo(uuidCollA, infoClusteredA);
+    infos = cache.getTTLInfos();
+    ASSERT_EQ(infos.size(), 0U);
+}
+
+}  // namespace
+}  // namespace mongo