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-rw-r--r--src/mongo/db/query/util/deferred_test.cpp98
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diff --git a/src/mongo/db/query/util/deferred_test.cpp b/src/mongo/db/query/util/deferred_test.cpp
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-/**
- * Copyright (C) 2023-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/query/util/deferred.h"
-
-#include "mongo/unittest/unittest.h"
-
-namespace mongo {
-using std::string;
-using namespace std::string_literals;
-
-
-TEST(DeferredTest, EagerInitialization) {
- Deferred<string> eager{"someString"};
- ASSERT_TRUE(eager.isInitialized());
- ASSERT_EQ(eager.get(), "someString"s);
- ASSERT_EQ(*eager, "someString"s);
-}
-
-TEST(DeferredTest, DeferredInitialization) {
- size_t initializationCount = 0;
- Deferred<string> deferred{[&]() {
- initializationCount++;
- return "someString"s;
- }};
- ASSERT_FALSE(deferred.isInitialized());
-
- // Ensure the deferred object wasn't initialized on creation.
- ASSERT_EQ(initializationCount, 0);
-
- // Ensure that the deferred object is initialized on pointer dereferences.
- ASSERT_FALSE(deferred->empty());
- ASSERT_TRUE(deferred.isInitialized());
-
- ASSERT_EQ(initializationCount, 1);
-
- // Ensure that the content of the deferred object is equal to its raw counterpart, while also
- // verifing that it is initialized at most once.
- ASSERT_EQ(deferred.get(), "someString"s);
- ASSERT_EQ(initializationCount, 1);
-}
-
-TEST(DeferredTest, DeferredInitializationWithOneArgument) {
- size_t initializationCount = 0;
- Deferred<string, const string&> deferred{[&](const string& input) {
- initializationCount++;
- return "{" + input + "}";
- }};
-
- // Ensure the deferred object wasn't initialized on creation.
- ASSERT_EQ(initializationCount, 0);
-
- // Ensure that the content of the deferred object is equal to its raw counterpart, while also
- // verifing that it is initialized at most once.
- ASSERT_EQ(deferred.get("more curlies"), "{more curlies}"s);
- ASSERT_EQ(initializationCount, 1);
-
- // Note that the value is cached, so it's not really valid to call it with a different argument.
- ASSERT_EQ(deferred.get("merganser"), "{more curlies}"s);
- ASSERT_EQ(initializationCount, 1);
-}
-
-TEST(DeferredTest, DeferredInitializationWithTwoArgs) {
- Deferred<string, const string&, const string&> deferred{
- [&](const auto& input, const auto& prefix) { return prefix + input; }};
-
- ASSERT_EQ(deferred.get("cowbell", "more "), "more cowbell"s);
- ASSERT_EQ(deferred.get("cowbell", "more "), "more cowbell"s);
- ASSERT_EQ(deferred.get("cowbell", "less?"), "more cowbell"s);
- ASSERT_EQ(deferred.get("tests", "better"), "more cowbell"s);
-}
-} // namespace mongo