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diff --git a/absl/container/internal/hash_policy_traits_test.cc b/absl/container/internal/hash_policy_traits_test.cc
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+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/container/internal/hash_policy_traits.h"
+
+#include <functional>
+#include <memory>
+#include <new>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+namespace absl {
+namespace container_internal {
+namespace {
+
+using ::testing::MockFunction;
+using ::testing::Return;
+using ::testing::ReturnRef;
+
+using Alloc = std::allocator<int>;
+using Slot = int;
+
+struct PolicyWithoutOptionalOps {
+ using slot_type = Slot;
+ using key_type = Slot;
+ using init_type = Slot;
+
+ static std::function<void(void*, Slot*, Slot)> construct;
+ static std::function<void(void*, Slot*)> destroy;
+
+ static std::function<Slot&(Slot*)> element;
+ static int apply(int v) { return apply_impl(v); }
+ static std::function<int(int)> apply_impl;
+ static std::function<Slot&(Slot*)> value;
+};
+
+std::function<void(void*, Slot*, Slot)> PolicyWithoutOptionalOps::construct;
+std::function<void(void*, Slot*)> PolicyWithoutOptionalOps::destroy;
+
+std::function<Slot&(Slot*)> PolicyWithoutOptionalOps::element;
+std::function<int(int)> PolicyWithoutOptionalOps::apply_impl;
+std::function<Slot&(Slot*)> PolicyWithoutOptionalOps::value;
+
+struct PolicyWithOptionalOps : PolicyWithoutOptionalOps {
+ static std::function<void(void*, Slot*, Slot*)> transfer;
+};
+
+std::function<void(void*, Slot*, Slot*)> PolicyWithOptionalOps::transfer;
+
+struct Test : ::testing::Test {
+ Test() {
+ PolicyWithoutOptionalOps::construct = [&](void* a1, Slot* a2, Slot a3) {
+ construct.Call(a1, a2, std::move(a3));
+ };
+ PolicyWithoutOptionalOps::destroy = [&](void* a1, Slot* a2) {
+ destroy.Call(a1, a2);
+ };
+
+ PolicyWithoutOptionalOps::element = [&](Slot* a1) -> Slot& {
+ return element.Call(a1);
+ };
+ PolicyWithoutOptionalOps::apply_impl = [&](int a1) -> int {
+ return apply.Call(a1);
+ };
+ PolicyWithoutOptionalOps::value = [&](Slot* a1) -> Slot& {
+ return value.Call(a1);
+ };
+
+ PolicyWithOptionalOps::transfer = [&](void* a1, Slot* a2, Slot* a3) {
+ return transfer.Call(a1, a2, a3);
+ };
+ }
+
+ std::allocator<int> alloc;
+ int a = 53;
+
+ MockFunction<void(void*, Slot*, Slot)> construct;
+ MockFunction<void(void*, Slot*)> destroy;
+
+ MockFunction<Slot&(Slot*)> element;
+ MockFunction<int(int)> apply;
+ MockFunction<Slot&(Slot*)> value;
+
+ MockFunction<void(void*, Slot*, Slot*)> transfer;
+};
+
+TEST_F(Test, construct) {
+ EXPECT_CALL(construct, Call(&alloc, &a, 53));
+ hash_policy_traits<PolicyWithoutOptionalOps>::construct(&alloc, &a, 53);
+}
+
+TEST_F(Test, destroy) {
+ EXPECT_CALL(destroy, Call(&alloc, &a));
+ hash_policy_traits<PolicyWithoutOptionalOps>::destroy(&alloc, &a);
+}
+
+TEST_F(Test, element) {
+ int b = 0;
+ EXPECT_CALL(element, Call(&a)).WillOnce(ReturnRef(b));
+ EXPECT_EQ(&b, &hash_policy_traits<PolicyWithoutOptionalOps>::element(&a));
+}
+
+TEST_F(Test, apply) {
+ EXPECT_CALL(apply, Call(42)).WillOnce(Return(1337));
+ EXPECT_EQ(1337, (hash_policy_traits<PolicyWithoutOptionalOps>::apply(42)));
+}
+
+TEST_F(Test, value) {
+ int b = 0;
+ EXPECT_CALL(value, Call(&a)).WillOnce(ReturnRef(b));
+ EXPECT_EQ(&b, &hash_policy_traits<PolicyWithoutOptionalOps>::value(&a));
+}
+
+TEST_F(Test, without_transfer) {
+ int b = 42;
+ EXPECT_CALL(element, Call(&b)).WillOnce(::testing::ReturnRef(b));
+ EXPECT_CALL(construct, Call(&alloc, &a, b));
+ EXPECT_CALL(destroy, Call(&alloc, &b));
+ hash_policy_traits<PolicyWithoutOptionalOps>::transfer(&alloc, &a, &b);
+}
+
+TEST_F(Test, with_transfer) {
+ int b = 42;
+ EXPECT_CALL(transfer, Call(&alloc, &a, &b));
+ hash_policy_traits<PolicyWithOptionalOps>::transfer(&alloc, &a, &b);
+}
+
+} // namespace
+} // namespace container_internal
+} // namespace absl