chromium/third_party/dawn/src/dawn/tests/unittests/ResultTests.cpp

// Copyright 2018 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <memory>
#include <utility>
#include <vector>

#include "dawn/common/Ref.h"
#include "dawn/common/RefCounted.h"
#include "dawn/common/Result.h"
#include "gtest/gtest.h"

namespace dawn {
namespace {

template <typename T, typename E>
void TestError(Result<T, E>* result, E expectedError) { … }

template <typename T, typename E>
void TestSuccess(Result<T, E>* result, T expectedSuccess) { … }

static int placeholderError = …;
static float placeholderSuccess = …;
static const float placeholderConstSuccess = …;

class AClass : public RefCounted { … };

// Tests using the following overload of TestSuccess make
// local Ref instances to placeholderSuccessObj. Tests should
// ensure any local Ref objects made along the way continue
// to point to placeholderSuccessObj.
template <typename T, typename E>
void TestSuccess(Result<Ref<T>, E>* result, T* expectedSuccess) { … }

// Result<void, E*>

// Test constructing an error Result<void, E>
TEST(ResultOnlyPointerError, ConstructingError) { … }

// Test moving an error Result<void, E>
TEST(ResultOnlyPointerError, MovingError) { … }

// Test returning an error Result<void, E>
TEST(ResultOnlyPointerError, ReturningError) { … }

// Test constructing a success Result<void, E>
TEST(ResultOnlyPointerError, ConstructingSuccess) { … }

// Test moving a success Result<void, E>
TEST(ResultOnlyPointerError, MovingSuccess) { … }

// Test returning a success Result<void, E>
TEST(ResultOnlyPointerError, ReturningSuccess) { … }

// Result<T*, E*>

// Test constructing an error Result<T*, E>
TEST(ResultBothPointer, ConstructingError) { … }

// Test moving an error Result<T*, E>
TEST(ResultBothPointer, MovingError) { … }

// Test returning an error Result<T*, E>
TEST(ResultBothPointer, ReturningError) { … }

// Test constructing a success Result<T*, E>
TEST(ResultBothPointer, ConstructingSuccess) { … }

// Test moving a success Result<T*, E>
TEST(ResultBothPointer, MovingSuccess) { … }

// Test returning a success Result<T*, E>
TEST(ResultBothPointer, ReturningSuccess) { … }

// Tests converting from a Result<TChild*, E>
TEST(ResultBothPointer, ConversionFromChildClass) { … }

// Result<const T*, E>

// Test constructing an error Result<const T*, E>
TEST(ResultBothPointerWithConstResult, ConstructingError) { … }

// Test moving an error Result<const T*, E>
TEST(ResultBothPointerWithConstResult, MovingError) { … }

// Test returning an error Result<const T*, E*>
TEST(ResultBothPointerWithConstResult, ReturningError) { … }

// Test constructing a success Result<const T*, E*>
TEST(ResultBothPointerWithConstResult, ConstructingSuccess) { … }

// Test moving a success Result<const T*, E*>
TEST(ResultBothPointerWithConstResult, MovingSuccess) { … }

// Test returning a success Result<const T*, E*>
TEST(ResultBothPointerWithConstResult, ReturningSuccess) { … }

// Result<Ref<T>, E>

// Test constructing an error Result<Ref<T>, E>
TEST(ResultRefT, ConstructingError) { … }

// Test moving an error Result<Ref<T>, E>
TEST(ResultRefT, MovingError) { … }

// Test returning an error Result<Ref<T>, E>
TEST(ResultRefT, ReturningError) { … }

// Test constructing a success Result<Ref<T>, E>
TEST(ResultRefT, ConstructingSuccess) { … }

// Test moving a success Result<Ref<T>, E>
TEST(ResultRefT, MovingSuccess) { … }

// Test returning a success Result<Ref<T>, E>
TEST(ResultRefT, ReturningSuccess) { … }

class OtherClass { … };
class Base : public RefCounted { … };
class Child : public OtherClass, public Base { … };

// Test constructing a Result<Ref<TChild>, E>
TEST(ResultRefT, ConversionFromChildConstructor) { … }

// Test copy constructing Result<Ref<TChild>, E>
TEST(ResultRefT, ConversionFromChildCopyConstructor) { … }

// Test assignment operator for Result<Ref<TChild>, E>
TEST(ResultRefT, ConversionFromChildAssignmentOperator) { … }

// Result<T, E>

// Test constructing an error Result<T, E>
TEST(ResultGeneric, ConstructingError) { … }

// Test moving an error Result<T, E>
TEST(ResultGeneric, MovingError) { … }

// Test returning an error Result<T, E>
TEST(ResultGeneric, ReturningError) { … }

// Test constructing a success Result<T, E>
TEST(ResultGeneric, ConstructingSuccess) { … }

// Test moving a success Result<T, E>
TEST(ResultGeneric, MovingSuccess) { … }

// Test returning a success Result<T, E>
TEST(ResultGeneric, ReturningSuccess) { … }

class NonDefaultConstructible { … };

// Test constructing an error Result<T, E> for non-default-constructible T
TEST(ResultNonDefaultConstructible, ConstructingError) { … }

// Test moving an error Result<T, E> for non-default-constructible T
TEST(ResultNonDefaultConstructible, MovingError) { … }

// Test returning an error Result<T, E> for non-default-constructible T
TEST(ResultNonDefaultConstructible, ReturningError) { … }

// Test constructing a success Result<T, E> for non-default-constructible T
TEST(ResultNonDefaultConstructible, ConstructingSuccess) { … }

// Test moving a success Result<T, E> for non-default-constructible T
TEST(ResultNonDefaultConstructible, MovingSuccess) { … }

// Test returning a success Result<T, E> for non-default-constructible T
TEST(ResultNonDefaultConstructible, ReturningSuccess) { … }

}  // anonymous namespace
}  // namespace dawn