pw_result/result_test.cc - pigweed/pigweed - Git at Google

 // Copyright 2022 The Pigweed 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
 //
 //     https://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.

 // pw::Result is derived from absl::StatusOr, but has some small differences.
 // This test covers basic pw::Result functionality and as well as the features
 // supported by pw::Result that are not supported by absl::StatusOr (constexpr
 // use in particular).
 //
 // The complete, thorough pw::Result tests are in statusor_test.cc, which is
 // derived from Abseil's tests for absl::StatusOr.

 #include "pw_result/result.h"

 #include "gtest/gtest.h"
 #include "pw_status/status.h"
 #include "pw_status/try.h"

 namespace pw {
 namespace {

 TEST(Result, CreateOk) {
   Result<const char*> res("hello");
   EXPECT_TRUE(res.ok());
   EXPECT_EQ(res.status(), OkStatus());
   EXPECT_EQ(res.value(), "hello");
 }

 TEST(Result, CreateNotOk) {
   Result<int> res(Status::DataLoss());
   EXPECT_FALSE(res.ok());
   EXPECT_EQ(res.status(), Status::DataLoss());
 }

 TEST(Result, ValueOr) {
   Result<int> good(3);
   Result<int> bad(Status::DataLoss());
   EXPECT_EQ(good.value_or(42), 3);
   EXPECT_EQ(bad.value_or(42), 42);
 }

 TEST(Result, Deref) {
   struct Tester {
     constexpr bool True() { return true; }
     constexpr bool False() { return false; }
   };

   auto tester = Result<Tester>(Tester());
   EXPECT_TRUE(tester.ok());
   EXPECT_TRUE(tester->True());
   EXPECT_FALSE(tester->False());
   EXPECT_TRUE((*tester).True());
   EXPECT_FALSE((*tester).False());
   EXPECT_EQ(tester.value().True(), tester->True());
   EXPECT_EQ(tester.value().False(), tester->False());
 }

 TEST(Result, ConstDeref) {
   struct Tester {
     constexpr bool True() const { return true; }
     constexpr bool False() const { return false; }
   };

   const auto tester = Result<Tester>(Tester());
   EXPECT_TRUE(tester.ok());
   EXPECT_TRUE(tester->True());
   EXPECT_FALSE(tester->False());
   EXPECT_TRUE((*tester).True());
   EXPECT_FALSE((*tester).False());
   EXPECT_EQ(tester.value().True(), tester->True());
   EXPECT_EQ(tester.value().False(), tester->False());
 }

 TEST(Result, ConstructType) {
   struct Point {
     Point(int a, int b) : x(a), y(b) {}

     int x;
     int y;
   };

   Result<Point> origin{std::in_place, 0, 0};
   ASSERT_TRUE(origin.ok());
   ASSERT_EQ(origin.value().x, 0);
   ASSERT_EQ(origin.value().y, 0);
 }

 Result<float> Divide(float a, float b) {
   if (b == 0) {
     return Status::InvalidArgument();
   }
   return a / b;
 }

 TEST(Divide, ReturnOk) {
   Result<float> res = Divide(10, 5);
   ASSERT_TRUE(res.ok());
   EXPECT_EQ(res.value(), 2.0f);
 }

 TEST(Divide, ReturnNotOk) {
   Result<float> res = Divide(10, 0);
   EXPECT_FALSE(res.ok());
   EXPECT_EQ(res.status(), Status::InvalidArgument());
 }

 Result<bool> ReturnResult(Result<bool> result) { return result; }

 Status TryResultAssign(Result<bool> result) {
   PW_TRY_ASSIGN(const bool value, ReturnResult(result));

   // Any status other than OK should have already returned.
   EXPECT_EQ(result.status(), OkStatus());
   EXPECT_EQ(value, result.value());
   return result.status();
 }

 TEST(Result, TryAssign) {
   EXPECT_EQ(TryResultAssign(Status::Cancelled()), Status::Cancelled());
   EXPECT_EQ(TryResultAssign(Status::DataLoss()), Status::DataLoss());
   EXPECT_EQ(TryResultAssign(Status::Unimplemented()), Status::Unimplemented());
   EXPECT_EQ(TryResultAssign(false), OkStatus());
   EXPECT_EQ(TryResultAssign(true), OkStatus());
 }

 struct Value {
   int number;
 };

 TEST(Result, ConstexprOk) {
   static constexpr pw::Result<Value> kResult(Value{123});

   static_assert(kResult.status() == pw::OkStatus());
   static_assert(kResult.ok());

   static_assert((*kResult).number == 123);
   static_assert((*std::move(kResult)).number == 123);

   static_assert(kResult->number == 123);
   static_assert(std::move(kResult)->number == 123);

   static_assert(kResult.value().number == 123);
   static_assert(std::move(kResult).value().number == 123);

   static_assert(kResult.value_or(Value{99}).number == 123);
   static_assert(std::move(kResult).value_or(Value{99}).number == 123);
 }

 TEST(Result, ConstexprNotOk) {
   static constexpr pw::Result<Value> kResult(pw::Status::NotFound());

   static_assert(kResult.status() == pw::Status::NotFound());
   static_assert(!kResult.ok());

   static_assert(kResult.value_or(Value{99}).number == 99);
   static_assert(std::move(kResult).value_or(Value{99}).number == 99);
 }

 TEST(Result, ConstexprNotOkCopy) {
   static constexpr pw::Result<Value> kResult(pw::Status::NotFound());
   constexpr pw::Result<Value> kResultCopy(kResult);

   static_assert(kResultCopy.status() == pw::Status::NotFound());
   static_assert(!kResultCopy.ok());

   static_assert(kResultCopy.value_or(Value{99}).number == 99);
   static_assert(std::move(kResultCopy).value_or(Value{99}).number == 99);
 }

 auto multiply = [](int x) -> Result<int> { return x * 2; };
 auto add_two = [](int x) -> Result<int> { return x + 2; };
 auto fail_unknown = [](int) -> Result<int> { return Status::Unknown(); };

 TEST(Result, AndThenNonConstLValueRefInvokeSuccess) {
   Result<int> r = 32;
   auto ret = r.and_then(multiply);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 64);
 }

 TEST(Result, AndThenNonConstLValueRefInvokeFail) {
   Result<int> r = 32;
   auto ret = r.and_then(fail_unknown);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::Unknown());
 }

 TEST(Result, AndThenNonConstLValueRefSkips) {
   Result<int> r = Status::NotFound();
   auto ret = r.and_then(multiply);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::NotFound());
 }

 TEST(Result, AndThenNonConstRvalueRefInvokeSuccess) {
   Result<int> r = 32;
   auto ret = std::move(r).and_then(multiply);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 64);
 }

 TEST(Result, AndThenNonConstRvalueRefInvokeFails) {
   Result<int> r = 64;
   auto ret = std::move(r).and_then(fail_unknown);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::Unknown());
 }

 TEST(Result, AndThenNonConstRvalueRefSkips) {
   Result<int> r = Status::NotFound();
   auto ret = std::move(r).and_then(multiply);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::NotFound());
 }

 TEST(Result, AndThenConstLValueRefInvokeSuccess) {
   const Result<int> r = 32;
   auto ret = r.and_then(multiply);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 64);
 }

 TEST(Result, AndThenConstLValueRefInvokeFail) {
   const Result<int> r = 32;
   auto ret = r.and_then(fail_unknown);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::Unknown());
 }

 TEST(Result, AndThenConstLValueRefSkips) {
   const Result<int> r = Status::NotFound();
   auto ret = r.and_then(multiply);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::NotFound());
 }

 TEST(Result, AndThenConstRValueRefInvokeSuccess) {
   const Result<int> r = 32;
   auto ret = std::move(r).and_then(multiply);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 64);
 }

 TEST(Result, AndThenConstRValueRefInvokeFail) {
   const Result<int> r = 32;
   auto ret = std::move(r).and_then(fail_unknown);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::Unknown());
 }

 TEST(Result, AndThenConstRValueRefSkips) {
   const Result<int> r = Status::NotFound();
   auto ret = std::move(r).and_then(multiply);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::NotFound());
 }

 TEST(Result, AndThenMultipleChained) {
   Result<int> r = 32;
   auto ret = r.and_then(multiply).and_then(add_two).and_then(multiply);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 132);
 }

 auto return_status = [](Status) { return Status::Unknown(); };
 auto return_result = [](Status) { return Result<int>(Status::Internal()); };

 TEST(Result, OrElseNonConstLValueRefSkips) {
   Result<int> r = 32;
   auto ret = r.or_else(return_status);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 32);
 }

 TEST(Result, OrElseNonConstLValueRefStatusInvokes) {
   Result<int> r = Status::NotFound();
   auto ret = r.or_else(return_status);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::Unknown());
 }

 TEST(Result, OrElseNonConstLValueRefResultInvokes) {
   Result<int> r = Status::NotFound();
   auto ret = r.or_else(return_result);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::Internal());
 }

 TEST(Result, OrElseNonConstLValueRefVoidSkips) {
   Result<int> r = 32;
   bool invoked = false;
   auto ret = r.or_else([&invoked](Status) { invoked = true; });
   EXPECT_FALSE(invoked);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 32);
 }

 TEST(Result, OrElseNonConstLValueRefVoidInvokes) {
   Result<int> r = Status::NotFound();
   bool invoked = false;
   auto ret = r.or_else([&invoked](Status) { invoked = true; });
   EXPECT_TRUE(invoked);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::NotFound());
 }

 TEST(Result, OrElseNonConstRValueRefSkips) {
   Result<int> r = 32;
   auto ret = std::move(r).or_else(return_status);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 32);
 }

 TEST(Result, OrElseNonConstRValueRefStatusInvokes) {
   Result<int> r = Status::NotFound();
   auto ret = std::move(r).or_else(return_status);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::Unknown());
 }

 TEST(Result, OrElseNonConstRValueRefResultInvokes) {
   Result<int> r = Status::NotFound();
   auto ret = std::move(r).or_else(return_result);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::Internal());
 }

 TEST(Result, OrElseNonConstRValueRefVoidSkips) {
   Result<int> r = 32;
   bool invoked = false;
   auto ret = std::move(r).or_else([&invoked](Status) { invoked = true; });
   EXPECT_FALSE(invoked);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 32);
 }

 TEST(Result, OrElseNonConstRValueRefVoidInvokes) {
   Result<int> r = Status::NotFound();
   bool invoked = false;
   auto ret = std::move(r).or_else([&invoked](Status) { invoked = true; });
   EXPECT_TRUE(invoked);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::NotFound());
 }

 TEST(Result, OrElseConstLValueRefSkips) {
   const Result<int> r = 32;
   auto ret = r.or_else(return_status);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 32);
 }

 TEST(Result, OrElseConstLValueRefStatusInvokes) {
   const Result<int> r = Status::NotFound();
   auto ret = r.or_else(return_status);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::Unknown());
 }

 TEST(Result, OrElseConstLValueRefResultInvokes) {
   const Result<int> r = Status::NotFound();
   auto ret = r.or_else(return_result);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::Internal());
 }

 TEST(Result, OrElseConstLValueRefVoidSkips) {
   const Result<int> r = 32;
   bool invoked = false;
   auto ret = r.or_else([&invoked](Status) { invoked = true; });
   EXPECT_FALSE(invoked);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 32);
 }

 TEST(Result, OrElseConstLValueRefVoidInvokes) {
   const Result<int> r = Status::NotFound();
   bool invoked = false;
   auto ret = r.or_else([&invoked](Status) { invoked = true; });
   EXPECT_TRUE(invoked);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::NotFound());
 }

 TEST(Result, OrElseConstRValueRefSkips) {
   const Result<int> r = 32;
   auto ret = std::move(r).or_else(return_status);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 32);
 }

 TEST(Result, OrElseConstRValueRefStatusInvokes) {
   const Result<int> r = Status::NotFound();
   auto ret = std::move(r).or_else(return_status);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::Unknown());
 }

 TEST(Result, OrElseConstRValueRefResultInvokes) {
   const Result<int> r = Status::NotFound();
   auto ret = std::move(r).or_else(return_result);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::Internal());
 }

 TEST(Result, OrElseConstRValueRefVoidSkips) {
   const Result<int> r = 32;
   bool invoked = false;
   auto ret = std::move(r).or_else([&invoked](Status) { invoked = true; });
   EXPECT_FALSE(invoked);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 32);
 }

 TEST(Result, OrElseConstRValueRefVoidInvokes) {
   const Result<int> r = Status::NotFound();
   bool invoked = false;
   auto ret = std::move(r).or_else([&invoked](Status) { invoked = true; });
   EXPECT_TRUE(invoked);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::NotFound());
 }

 TEST(Result, OrElseMultipleChained) {
   Result<int> r = Status::NotFound();
   bool invoked = false;
   auto ret =
       r.or_else(return_result).or_else([&invoked](Status) { invoked = true; });
   EXPECT_TRUE(invoked);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::Internal());
 }

 auto multiply_int = [](int x) { return x * 2; };
 auto add_two_int = [](int x) { return x + 2; };
 auto make_value = [](int x) { return Value{.number = x}; };

 TEST(Result, TransformNonConstLValueRefInvokeSuccess) {
   Result<int> r = 32;
   auto ret = r.transform(multiply_int);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 64);
 }

 TEST(Result, TransformNonConstLValueRefInvokeDifferentType) {
   Result<int> r = 32;
   auto ret = r.transform(make_value);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(ret->number, 32);
 }

 TEST(Result, TransformNonConstLValueRefSkips) {
   Result<int> r = Status::NotFound();
   auto ret = r.transform(multiply_int);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::NotFound());
 }

 TEST(Result, TransformNonConstRValueRefInvokeSuccess) {
   Result<int> r = 32;
   auto ret = std::move(r).transform(multiply_int);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 64);
 }

 TEST(Result, TransformNonConstRValueRefInvokeDifferentType) {
   Result<int> r = 32;
   auto ret = std::move(r).transform(make_value);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(ret->number, 32);
 }

 TEST(Result, TransformNonConstRValueRefSkips) {
   Result<int> r = Status::NotFound();
   auto ret = std::move(r).transform(multiply_int);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::NotFound());
 }

 TEST(Result, TransformConstLValueRefInvokeSuccess) {
   const Result<int> r = 32;
   auto ret = r.transform(multiply_int);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 64);
 }

 TEST(Result, TransformConstLValueRefInvokeDifferentType) {
   const Result<int> r = 32;
   auto ret = r.transform(make_value);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(ret->number, 32);
 }

 TEST(Result, TransformConstLValueRefSkips) {
   const Result<int> r = Status::NotFound();
   auto ret = r.transform(multiply_int);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::NotFound());
 }

 TEST(Result, TransformConstRValueRefInvokeSuccess) {
   const Result<int> r = 32;
   auto ret = std::move(r).transform(multiply_int);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(*ret, 64);
 }

 TEST(Result, TransformConstRValueRefInvokeDifferentType) {
   const Result<int> r = 32;
   auto ret = std::move(r).transform(make_value);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(ret->number, 32);
 }

 TEST(Result, TransformConstRValueRefSkips) {
   const Result<int> r = Status::NotFound();
   auto ret = std::move(r).transform(multiply_int);
   ASSERT_FALSE(ret.ok());
   EXPECT_EQ(ret.status(), Status::NotFound());
 }

 TEST(Result, TransformMultipleChained) {
   Result<int> r = 32;
   auto ret = r.transform(multiply_int)
                  .transform(add_two_int)
                  .transform(multiply_int)
                  .transform(make_value);
   ASSERT_TRUE(ret.ok());
   EXPECT_EQ(ret->number, 132);
 }

 }  // namespace
 }  // namespace pw
	// Copyright 2022 The Pigweed 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
	//
	// https://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.

	// pw::Result is derived from absl::StatusOr, but has some small differences.
	// This test covers basic pw::Result functionality and as well as the features
	// supported by pw::Result that are not supported by absl::StatusOr (constexpr
	// use in particular).
	//
	// The complete, thorough pw::Result tests are in statusor_test.cc, which is
	// derived from Abseil's tests for absl::StatusOr.

	#include "pw_result/result.h"

	#include "gtest/gtest.h"
	#include "pw_status/status.h"
	#include "pw_status/try.h"

	namespace pw {
	namespace {

	TEST(Result, CreateOk) {
	Result<const char*> res("hello");
	EXPECT_TRUE(res.ok());
	EXPECT_EQ(res.status(), OkStatus());
	EXPECT_EQ(res.value(), "hello");
	}

	TEST(Result, CreateNotOk) {
	Result<int> res(Status::DataLoss());
	EXPECT_FALSE(res.ok());
	EXPECT_EQ(res.status(), Status::DataLoss());
	}

	TEST(Result, ValueOr) {
	Result<int> good(3);
	Result<int> bad(Status::DataLoss());
	EXPECT_EQ(good.value_or(42), 3);
	EXPECT_EQ(bad.value_or(42), 42);
	}

	TEST(Result, Deref) {
	struct Tester {
	constexpr bool True() { return true; }
	constexpr bool False() { return false; }
	};

	auto tester = Result<Tester>(Tester());
	EXPECT_TRUE(tester.ok());
	EXPECT_TRUE(tester->True());
	EXPECT_FALSE(tester->False());
	EXPECT_TRUE((*tester).True());
	EXPECT_FALSE((*tester).False());
	EXPECT_EQ(tester.value().True(), tester->True());
	EXPECT_EQ(tester.value().False(), tester->False());
	}

	TEST(Result, ConstDeref) {
	struct Tester {
	constexpr bool True() const { return true; }
	constexpr bool False() const { return false; }
	};

	const auto tester = Result<Tester>(Tester());
	EXPECT_TRUE(tester.ok());
	EXPECT_TRUE(tester->True());
	EXPECT_FALSE(tester->False());
	EXPECT_TRUE((*tester).True());
	EXPECT_FALSE((*tester).False());
	EXPECT_EQ(tester.value().True(), tester->True());
	EXPECT_EQ(tester.value().False(), tester->False());
	}

	TEST(Result, ConstructType) {
	struct Point {
	Point(int a, int b) : x(a), y(b) {}

	int x;
	int y;
	};

	Result<Point> origin{std::in_place, 0, 0};
	ASSERT_TRUE(origin.ok());
	ASSERT_EQ(origin.value().x, 0);
	ASSERT_EQ(origin.value().y, 0);
	}

	Result<float> Divide(float a, float b) {
	if (b == 0) {
	return Status::InvalidArgument();
	}
	return a / b;
	}

	TEST(Divide, ReturnOk) {
	Result<float> res = Divide(10, 5);
	ASSERT_TRUE(res.ok());
	EXPECT_EQ(res.value(), 2.0f);
	}

	TEST(Divide, ReturnNotOk) {
	Result<float> res = Divide(10, 0);
	EXPECT_FALSE(res.ok());
	EXPECT_EQ(res.status(), Status::InvalidArgument());
	}

	Result<bool> ReturnResult(Result<bool> result) { return result; }

	Status TryResultAssign(Result<bool> result) {
	PW_TRY_ASSIGN(const bool value, ReturnResult(result));

	// Any status other than OK should have already returned.
	EXPECT_EQ(result.status(), OkStatus());
	EXPECT_EQ(value, result.value());
	return result.status();
	}

	TEST(Result, TryAssign) {
	EXPECT_EQ(TryResultAssign(Status::Cancelled()), Status::Cancelled());
	EXPECT_EQ(TryResultAssign(Status::DataLoss()), Status::DataLoss());
	EXPECT_EQ(TryResultAssign(Status::Unimplemented()), Status::Unimplemented());
	EXPECT_EQ(TryResultAssign(false), OkStatus());
	EXPECT_EQ(TryResultAssign(true), OkStatus());
	}

	struct Value {
	int number;
	};

	TEST(Result, ConstexprOk) {
	static constexpr pw::Result<Value> kResult(Value{123});

	static_assert(kResult.status() == pw::OkStatus());
	static_assert(kResult.ok());

	static_assert((*kResult).number == 123);
	static_assert((*std::move(kResult)).number == 123);

	static_assert(kResult->number == 123);
	static_assert(std::move(kResult)->number == 123);

	static_assert(kResult.value().number == 123);
	static_assert(std::move(kResult).value().number == 123);

	static_assert(kResult.value_or(Value{99}).number == 123);
	static_assert(std::move(kResult).value_or(Value{99}).number == 123);
	}

	TEST(Result, ConstexprNotOk) {
	static constexpr pw::Result<Value> kResult(pw::Status::NotFound());

	static_assert(kResult.status() == pw::Status::NotFound());
	static_assert(!kResult.ok());

	static_assert(kResult.value_or(Value{99}).number == 99);
	static_assert(std::move(kResult).value_or(Value{99}).number == 99);
	}

	TEST(Result, ConstexprNotOkCopy) {
	static constexpr pw::Result<Value> kResult(pw::Status::NotFound());
	constexpr pw::Result<Value> kResultCopy(kResult);

	static_assert(kResultCopy.status() == pw::Status::NotFound());
	static_assert(!kResultCopy.ok());

	static_assert(kResultCopy.value_or(Value{99}).number == 99);
	static_assert(std::move(kResultCopy).value_or(Value{99}).number == 99);
	}

	auto multiply = [](int x) -> Result<int> { return x * 2; };
	auto add_two = [](int x) -> Result<int> { return x + 2; };
	auto fail_unknown = [](int) -> Result<int> { return Status::Unknown(); };

	TEST(Result, AndThenNonConstLValueRefInvokeSuccess) {
	Result<int> r = 32;
	auto ret = r.and_then(multiply);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 64);
	}

	TEST(Result, AndThenNonConstLValueRefInvokeFail) {
	Result<int> r = 32;
	auto ret = r.and_then(fail_unknown);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::Unknown());
	}

	TEST(Result, AndThenNonConstLValueRefSkips) {
	Result<int> r = Status::NotFound();
	auto ret = r.and_then(multiply);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::NotFound());
	}

	TEST(Result, AndThenNonConstRvalueRefInvokeSuccess) {
	Result<int> r = 32;
	auto ret = std::move(r).and_then(multiply);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 64);
	}

	TEST(Result, AndThenNonConstRvalueRefInvokeFails) {
	Result<int> r = 64;
	auto ret = std::move(r).and_then(fail_unknown);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::Unknown());
	}

	TEST(Result, AndThenNonConstRvalueRefSkips) {
	Result<int> r = Status::NotFound();
	auto ret = std::move(r).and_then(multiply);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::NotFound());
	}

	TEST(Result, AndThenConstLValueRefInvokeSuccess) {
	const Result<int> r = 32;
	auto ret = r.and_then(multiply);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 64);
	}

	TEST(Result, AndThenConstLValueRefInvokeFail) {
	const Result<int> r = 32;
	auto ret = r.and_then(fail_unknown);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::Unknown());
	}

	TEST(Result, AndThenConstLValueRefSkips) {
	const Result<int> r = Status::NotFound();
	auto ret = r.and_then(multiply);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::NotFound());
	}

	TEST(Result, AndThenConstRValueRefInvokeSuccess) {
	const Result<int> r = 32;
	auto ret = std::move(r).and_then(multiply);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 64);
	}

	TEST(Result, AndThenConstRValueRefInvokeFail) {
	const Result<int> r = 32;
	auto ret = std::move(r).and_then(fail_unknown);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::Unknown());
	}

	TEST(Result, AndThenConstRValueRefSkips) {
	const Result<int> r = Status::NotFound();
	auto ret = std::move(r).and_then(multiply);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::NotFound());
	}

	TEST(Result, AndThenMultipleChained) {
	Result<int> r = 32;
	auto ret = r.and_then(multiply).and_then(add_two).and_then(multiply);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 132);
	}

	auto return_status = [](Status) { return Status::Unknown(); };
	auto return_result = [](Status) { return Result<int>(Status::Internal()); };

	TEST(Result, OrElseNonConstLValueRefSkips) {
	Result<int> r = 32;
	auto ret = r.or_else(return_status);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 32);
	}

	TEST(Result, OrElseNonConstLValueRefStatusInvokes) {
	Result<int> r = Status::NotFound();
	auto ret = r.or_else(return_status);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::Unknown());
	}

	TEST(Result, OrElseNonConstLValueRefResultInvokes) {
	Result<int> r = Status::NotFound();
	auto ret = r.or_else(return_result);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::Internal());
	}

	TEST(Result, OrElseNonConstLValueRefVoidSkips) {
	Result<int> r = 32;
	bool invoked = false;
	auto ret = r.or_else([&invoked](Status) { invoked = true; });
	EXPECT_FALSE(invoked);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 32);
	}

	TEST(Result, OrElseNonConstLValueRefVoidInvokes) {
	Result<int> r = Status::NotFound();
	bool invoked = false;
	auto ret = r.or_else([&invoked](Status) { invoked = true; });
	EXPECT_TRUE(invoked);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::NotFound());
	}

	TEST(Result, OrElseNonConstRValueRefSkips) {
	Result<int> r = 32;
	auto ret = std::move(r).or_else(return_status);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 32);
	}

	TEST(Result, OrElseNonConstRValueRefStatusInvokes) {
	Result<int> r = Status::NotFound();
	auto ret = std::move(r).or_else(return_status);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::Unknown());
	}

	TEST(Result, OrElseNonConstRValueRefResultInvokes) {
	Result<int> r = Status::NotFound();
	auto ret = std::move(r).or_else(return_result);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::Internal());
	}

	TEST(Result, OrElseNonConstRValueRefVoidSkips) {
	Result<int> r = 32;
	bool invoked = false;
	auto ret = std::move(r).or_else([&invoked](Status) { invoked = true; });
	EXPECT_FALSE(invoked);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 32);
	}

	TEST(Result, OrElseNonConstRValueRefVoidInvokes) {
	Result<int> r = Status::NotFound();
	bool invoked = false;
	auto ret = std::move(r).or_else([&invoked](Status) { invoked = true; });
	EXPECT_TRUE(invoked);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::NotFound());
	}

	TEST(Result, OrElseConstLValueRefSkips) {
	const Result<int> r = 32;
	auto ret = r.or_else(return_status);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 32);
	}

	TEST(Result, OrElseConstLValueRefStatusInvokes) {
	const Result<int> r = Status::NotFound();
	auto ret = r.or_else(return_status);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::Unknown());
	}

	TEST(Result, OrElseConstLValueRefResultInvokes) {
	const Result<int> r = Status::NotFound();
	auto ret = r.or_else(return_result);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::Internal());
	}

	TEST(Result, OrElseConstLValueRefVoidSkips) {
	const Result<int> r = 32;
	bool invoked = false;
	auto ret = r.or_else([&invoked](Status) { invoked = true; });
	EXPECT_FALSE(invoked);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 32);
	}

	TEST(Result, OrElseConstLValueRefVoidInvokes) {
	const Result<int> r = Status::NotFound();
	bool invoked = false;
	auto ret = r.or_else([&invoked](Status) { invoked = true; });
	EXPECT_TRUE(invoked);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::NotFound());
	}

	TEST(Result, OrElseConstRValueRefSkips) {
	const Result<int> r = 32;
	auto ret = std::move(r).or_else(return_status);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 32);
	}

	TEST(Result, OrElseConstRValueRefStatusInvokes) {
	const Result<int> r = Status::NotFound();
	auto ret = std::move(r).or_else(return_status);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::Unknown());
	}

	TEST(Result, OrElseConstRValueRefResultInvokes) {
	const Result<int> r = Status::NotFound();
	auto ret = std::move(r).or_else(return_result);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::Internal());
	}

	TEST(Result, OrElseConstRValueRefVoidSkips) {
	const Result<int> r = 32;
	bool invoked = false;
	auto ret = std::move(r).or_else([&invoked](Status) { invoked = true; });
	EXPECT_FALSE(invoked);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 32);
	}

	TEST(Result, OrElseConstRValueRefVoidInvokes) {
	const Result<int> r = Status::NotFound();
	bool invoked = false;
	auto ret = std::move(r).or_else([&invoked](Status) { invoked = true; });
	EXPECT_TRUE(invoked);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::NotFound());
	}

	TEST(Result, OrElseMultipleChained) {
	Result<int> r = Status::NotFound();
	bool invoked = false;
	auto ret =
	r.or_else(return_result).or_else([&invoked](Status) { invoked = true; });
	EXPECT_TRUE(invoked);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::Internal());
	}

	auto multiply_int = [](int x) { return x * 2; };
	auto add_two_int = [](int x) { return x + 2; };
	auto make_value = [](int x) { return Value{.number = x}; };

	TEST(Result, TransformNonConstLValueRefInvokeSuccess) {
	Result<int> r = 32;
	auto ret = r.transform(multiply_int);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 64);
	}

	TEST(Result, TransformNonConstLValueRefInvokeDifferentType) {
	Result<int> r = 32;
	auto ret = r.transform(make_value);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(ret->number, 32);
	}

	TEST(Result, TransformNonConstLValueRefSkips) {
	Result<int> r = Status::NotFound();
	auto ret = r.transform(multiply_int);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::NotFound());
	}

	TEST(Result, TransformNonConstRValueRefInvokeSuccess) {
	Result<int> r = 32;
	auto ret = std::move(r).transform(multiply_int);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 64);
	}

	TEST(Result, TransformNonConstRValueRefInvokeDifferentType) {
	Result<int> r = 32;
	auto ret = std::move(r).transform(make_value);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(ret->number, 32);
	}

	TEST(Result, TransformNonConstRValueRefSkips) {
	Result<int> r = Status::NotFound();
	auto ret = std::move(r).transform(multiply_int);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::NotFound());
	}

	TEST(Result, TransformConstLValueRefInvokeSuccess) {
	const Result<int> r = 32;
	auto ret = r.transform(multiply_int);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 64);
	}

	TEST(Result, TransformConstLValueRefInvokeDifferentType) {
	const Result<int> r = 32;
	auto ret = r.transform(make_value);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(ret->number, 32);
	}

	TEST(Result, TransformConstLValueRefSkips) {
	const Result<int> r = Status::NotFound();
	auto ret = r.transform(multiply_int);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::NotFound());
	}

	TEST(Result, TransformConstRValueRefInvokeSuccess) {
	const Result<int> r = 32;
	auto ret = std::move(r).transform(multiply_int);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(*ret, 64);
	}

	TEST(Result, TransformConstRValueRefInvokeDifferentType) {
	const Result<int> r = 32;
	auto ret = std::move(r).transform(make_value);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(ret->number, 32);
	}

	TEST(Result, TransformConstRValueRefSkips) {
	const Result<int> r = Status::NotFound();
	auto ret = std::move(r).transform(multiply_int);
	ASSERT_FALSE(ret.ok());
	EXPECT_EQ(ret.status(), Status::NotFound());
	}

	TEST(Result, TransformMultipleChained) {
	Result<int> r = 32;
	auto ret = r.transform(multiply_int)
	.transform(add_two_int)
	.transform(multiply_int)
	.transform(make_value);
	ASSERT_TRUE(ret.ok());
	EXPECT_EQ(ret->number, 132);
	}

	} // namespace
	} // namespace pw