158 lines
3.6 KiB
C++
158 lines
3.6 KiB
C++
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <error/expected_utils.h>
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#include <gtest/gtest.h>
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#define LOG_TAG "Result-test"
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namespace android {
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namespace foo {
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class Value {
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public:
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explicit Value(int i) : mInt(i) {}
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Value(const Value&) = delete;
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Value(Value&&) = default;
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operator int() const { return mInt; }
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private:
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const int mInt;
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};
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class Status {
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public:
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explicit Status(int i) : mInt(i) {}
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Status(const Status&) = delete;
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Status(Status&&) = default;
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operator int() const { return mInt; }
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private:
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const int mInt;
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};
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bool errorIsOk(const Status& e) {
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return e == 0;
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}
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std::string errorToString(const Status& e) {
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std::ostringstream str;
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str << e;
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return str.str();
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}
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using Result = base::expected<Value, Status>;
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} // namespace foo
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namespace {
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using foo::Result;
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using foo::Status;
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using foo::Value;
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TEST(Result, ValueOrReturnSuccess) {
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Result result = []() -> Result {
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Value intermediate = VALUE_OR_RETURN(Result(Value(3)));
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return Value(intermediate + 1);
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}();
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ASSERT_TRUE(result.ok());
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EXPECT_EQ(4, result.value());
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}
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TEST(Result, ValueOrReturnFailure) {
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Result result = []() -> Result {
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Value intermediate = VALUE_OR_RETURN(Result(base::unexpected(Status(2))));
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return Value(intermediate + 1);
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}();
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ASSERT_FALSE(result.ok());
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EXPECT_EQ(2, result.error());
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}
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TEST(Result, ValueOrReturnStatusSuccess) {
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Status status = []() -> Status {
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Value intermediate = VALUE_OR_RETURN_STATUS(Result(Value(3)));
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(void) intermediate;
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return Status(0);
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}();
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EXPECT_EQ(0, status);
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}
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TEST(Result, ValueOrReturnStatusFailure) {
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Status status = []() -> Status {
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Value intermediate = VALUE_OR_RETURN_STATUS(Result(base::unexpected(Status(1))));
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(void) intermediate;
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return Status(0);
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}();
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EXPECT_EQ(1, status);
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}
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TEST(Result, ReturnIfErrorSuccess) {
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Result result = []() -> Result {
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RETURN_IF_ERROR(Status(0));
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return Value(5);
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}();
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ASSERT_TRUE(result.ok());
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EXPECT_EQ(5, result.value());
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}
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TEST(Result, ReturnIfErrorFailure) {
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Result result = []() -> Result {
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RETURN_IF_ERROR(Status(4));
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return Value(5);
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}();
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ASSERT_FALSE(result.ok());
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EXPECT_EQ(4, result.error());
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}
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TEST(Result, ReturnStatusIfErrorSuccess) {
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Status status = []() -> Status {
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RETURN_STATUS_IF_ERROR(Status(0));
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return Status(7);
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}();
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EXPECT_EQ(7, status);
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}
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TEST(Result, ReturnStatusIfErrorFailure) {
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Status status = []() -> Status {
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RETURN_STATUS_IF_ERROR(Status(3));
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return Status(0);
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}();
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EXPECT_EQ(3, status);
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}
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TEST(Result, ValueOrFatalSuccess) {
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Value value = VALUE_OR_FATAL(Result(Value(7)));
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EXPECT_EQ(7, value);
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}
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TEST(Result, ValueOrFatalFailure) {
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EXPECT_DEATH(VALUE_OR_FATAL(Result(base::unexpected(Status(3)))), "");
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}
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TEST(Result, FatalIfErrorSuccess) {
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FATAL_IF_ERROR(Status(0));
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}
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TEST(Result, FatalIfErrorFailure) {
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EXPECT_DEATH(FATAL_IF_ERROR(Status(3)), "");
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}
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} // namespace
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} // namespace android
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