1 files changed, 73 insertions, 0 deletions
diff --git a/src/mongo/db/query/util/memory_util_test.cpp b/src/mongo/db/query/util/memory_util_test.cpp
new file mode 100644
index 00000000000..78f7b3098d6
--- /dev/null
+++ b/src/mongo/db/query/util/memory_util_test.cpp
@@ -0,0 +1,73 @@
+/**
+ *    Copyright (C) 2021-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/memory_util.h"
+
+#include "mongo/unittest/unittest.h"
+
+namespace mongo::memory_util {
+
+bool operator==(const MemorySize& lhs, const MemorySize& rhs) {
+    constexpr double kEpsilon = 1e-10;
+    return std::abs(lhs.size - rhs.size) < kEpsilon && lhs.units == rhs.units;
+}
+
+TEST(MemorySizeTest, ParseUnitStringPercent) {
+    ASSERT_TRUE(MemoryUnits::kPercent == parseUnitString("%"));
+}
+
+TEST(MemorySizeTest, ParseUnitStringMB) {
+    ASSERT_TRUE(MemoryUnits::kMB == parseUnitString("MB"));
+    ASSERT_TRUE(MemoryUnits::kMB == parseUnitString("mb"));
+    ASSERT_TRUE(MemoryUnits::kMB == parseUnitString("mB"));
+    ASSERT_TRUE(MemoryUnits::kMB == parseUnitString("Mb"));
+}
+
+TEST(MemorySizeTest, ParseUnitStringGB) {
+    ASSERT_TRUE(MemoryUnits::kGB == parseUnitString("GB"));
+    ASSERT_TRUE(MemoryUnits::kGB == parseUnitString("gb"));
+    ASSERT_TRUE(MemoryUnits::kGB == parseUnitString("gB"));
+    ASSERT_TRUE(MemoryUnits::kGB == parseUnitString("Gb"));
+}
+
+TEST(MemorySizeTest, ParseUnitStringIncorrectValue) {
+    ASSERT_NOT_OK(parseUnitString("").getStatus());
+    ASSERT_NOT_OK(parseUnitString(" ").getStatus());
+    ASSERT_NOT_OK(parseUnitString("KB").getStatus());
+}
+
+TEST(MemorySizeTest, ParseMemorySize) {
+    ASSERT_TRUE((MemorySize{10.0, MemoryUnits::kPercent}) == MemorySize::parse("10%"));
+    ASSERT_TRUE((MemorySize{300.0, MemoryUnits::kMB}) == MemorySize::parse("300MB"));
+    ASSERT_TRUE((MemorySize{4.0, MemoryUnits::kGB}) == MemorySize::parse("4GB"));
+    ASSERT_TRUE((MemorySize{5.1, MemoryUnits::kPercent}) == MemorySize::parse(" 5.1%"));
+    ASSERT_TRUE((MemorySize{11.1, MemoryUnits::kMB}) == MemorySize::parse("11.1 mb"));
+    ASSERT_TRUE((MemorySize{12.1, MemoryUnits::kGB}) == MemorySize::parse("  12.1    Gb  "));
+}
+}  // namespace mongo::memory_util