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/*
* Copyright 2024 The Android Open Source Project
*
* 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 <ftl/expected.h>
#include <gtest/gtest.h>
#include <string>
#include <system_error>
namespace android::test {
using IntExp = ftl::Expected<int, std::errc>;
using StringExp = ftl::Expected<std::string, std::errc>;
using namespace std::string_literals;
TEST(Expected, Construct) {
// Default value.
EXPECT_TRUE(IntExp().has_value());
EXPECT_EQ(IntExp(), IntExp(0));
EXPECT_TRUE(StringExp().has_value());
EXPECT_EQ(StringExp(), StringExp(""));
// Value.
ASSERT_TRUE(IntExp(42).has_value());
EXPECT_EQ(42, IntExp(42).value());
ASSERT_TRUE(StringExp("test").has_value());
EXPECT_EQ("test"s, StringExp("test").value());
// Error.
const auto exp = StringExp(ftl::Unexpected(std::errc::invalid_argument));
ASSERT_FALSE(exp.has_value());
EXPECT_EQ(std::errc::invalid_argument, exp.error());
}
TEST(Expected, HasError) {
EXPECT_FALSE(IntExp(123).has_error([](auto) { return true; }));
EXPECT_FALSE(IntExp(ftl::Unexpected(std::errc::io_error)).has_error([](auto) { return false; }));
EXPECT_TRUE(StringExp(ftl::Unexpected(std::errc::permission_denied)).has_error([](auto e) {
return e == std::errc::permission_denied;
}));
}
TEST(Expected, ValueOpt) {
EXPECT_EQ(ftl::Optional(-1), IntExp(-1).value_opt());
EXPECT_EQ(std::nullopt, IntExp(ftl::Unexpected(std::errc::broken_pipe)).value_opt());
{
const StringExp exp("foo"s);
EXPECT_EQ(ftl::Optional('f'),
exp.value_opt().transform([](const auto& s) { return s.front(); }));
EXPECT_EQ("foo"s, exp.value());
}
{
StringExp exp("foobar"s);
EXPECT_EQ(ftl::Optional(6), std::move(exp).value_opt().transform(&std::string::length));
EXPECT_TRUE(exp.value().empty());
}
}
} // namespace android::test
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