260 lines
10 KiB
C++
260 lines
10 KiB
C++
// Copyright 2008, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Implements class templates NiceMock, NaggyMock, and StrictMock.
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//
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// Given a mock class MockFoo that is created using Google Mock,
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// NiceMock<MockFoo> is a subclass of MockFoo that allows
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// uninteresting calls (i.e. calls to mock methods that have no
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// EXPECT_CALL specs), NaggyMock<MockFoo> is a subclass of MockFoo
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// that prints a warning when an uninteresting call occurs, and
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// StrictMock<MockFoo> is a subclass of MockFoo that treats all
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// uninteresting calls as errors.
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//
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// Currently a mock is naggy by default, so MockFoo and
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// NaggyMock<MockFoo> behave like the same. However, we will soon
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// switch the default behavior of mocks to be nice, as that in general
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// leads to more maintainable tests. When that happens, MockFoo will
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// stop behaving like NaggyMock<MockFoo> and start behaving like
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// NiceMock<MockFoo>.
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//
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// NiceMock, NaggyMock, and StrictMock "inherit" the constructors of
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// their respective base class. Therefore you can write
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// NiceMock<MockFoo>(5, "a") to construct a nice mock where MockFoo
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// has a constructor that accepts (int, const char*), for example.
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//
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// A known limitation is that NiceMock<MockFoo>, NaggyMock<MockFoo>,
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// and StrictMock<MockFoo> only works for mock methods defined using
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// the MOCK_METHOD* family of macros DIRECTLY in the MockFoo class.
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// If a mock method is defined in a base class of MockFoo, the "nice"
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// or "strict" modifier may not affect it, depending on the compiler.
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// In particular, nesting NiceMock, NaggyMock, and StrictMock is NOT
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// supported.
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#ifndef GOOGLEMOCK_INCLUDE_GMOCK_GMOCK_NICE_STRICT_H_
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#define GOOGLEMOCK_INCLUDE_GMOCK_GMOCK_NICE_STRICT_H_
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#include <type_traits>
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#include "gmock/gmock-spec-builders.h"
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#include "gmock/internal/gmock-port.h"
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namespace testing {
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template <class MockClass>
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class NiceMock;
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template <class MockClass>
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class NaggyMock;
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template <class MockClass>
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class StrictMock;
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namespace internal {
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template <typename T>
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std::true_type StrictnessModifierProbe(const NiceMock<T>&);
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template <typename T>
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std::true_type StrictnessModifierProbe(const NaggyMock<T>&);
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template <typename T>
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std::true_type StrictnessModifierProbe(const StrictMock<T>&);
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std::false_type StrictnessModifierProbe(...);
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template <typename T>
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constexpr bool HasStrictnessModifier() {
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return decltype(StrictnessModifierProbe(std::declval<const T&>()))::value;
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}
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// Base classes that register and deregister with testing::Mock to alter the
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// default behavior around uninteresting calls. Inheriting from one of these
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// classes first and then MockClass ensures the MockClass constructor is run
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// after registration, and that the MockClass destructor runs before
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// deregistration. This guarantees that MockClass's constructor and destructor
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// run with the same level of strictness as its instance methods.
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#if GTEST_OS_WINDOWS && !GTEST_OS_WINDOWS_MINGW && \
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(defined(_MSC_VER) || defined(__clang__))
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// We need to mark these classes with this declspec to ensure that
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// the empty base class optimization is performed.
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#define GTEST_INTERNAL_EMPTY_BASE_CLASS __declspec(empty_bases)
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#else
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#define GTEST_INTERNAL_EMPTY_BASE_CLASS
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#endif
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template <typename Base>
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class NiceMockImpl {
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public:
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NiceMockImpl() { ::testing::Mock::AllowUninterestingCalls(this); }
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~NiceMockImpl() { ::testing::Mock::UnregisterCallReaction(this); }
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};
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template <typename Base>
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class NaggyMockImpl {
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public:
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NaggyMockImpl() { ::testing::Mock::WarnUninterestingCalls(this); }
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~NaggyMockImpl() { ::testing::Mock::UnregisterCallReaction(this); }
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};
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template <typename Base>
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class StrictMockImpl {
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public:
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StrictMockImpl() { ::testing::Mock::FailUninterestingCalls(this); }
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~StrictMockImpl() { ::testing::Mock::UnregisterCallReaction(this); }
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};
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} // namespace internal
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template <class MockClass>
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class GTEST_INTERNAL_EMPTY_BASE_CLASS NiceMock
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: private internal::NiceMockImpl<MockClass>,
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public MockClass {
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public:
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static_assert(!internal::HasStrictnessModifier<MockClass>(),
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"Can't apply NiceMock to a class hierarchy that already has a "
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"strictness modifier. See "
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"https://google.github.io/googletest/"
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"gmock_cook_book.html#NiceStrictNaggy");
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NiceMock() : MockClass() {
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static_assert(sizeof(*this) == sizeof(MockClass),
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"The impl subclass shouldn't introduce any padding");
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}
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// Ideally, we would inherit base class's constructors through a using
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// declaration, which would preserve their visibility. However, many existing
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// tests rely on the fact that current implementation reexports protected
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// constructors as public. These tests would need to be cleaned up first.
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// Single argument constructor is special-cased so that it can be
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// made explicit.
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template <typename A>
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explicit NiceMock(A&& arg) : MockClass(std::forward<A>(arg)) {
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static_assert(sizeof(*this) == sizeof(MockClass),
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"The impl subclass shouldn't introduce any padding");
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}
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template <typename TArg1, typename TArg2, typename... An>
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NiceMock(TArg1&& arg1, TArg2&& arg2, An&&... args)
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: MockClass(std::forward<TArg1>(arg1), std::forward<TArg2>(arg2),
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std::forward<An>(args)...) {
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static_assert(sizeof(*this) == sizeof(MockClass),
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"The impl subclass shouldn't introduce any padding");
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}
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private:
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GTEST_DISALLOW_COPY_AND_ASSIGN_(NiceMock);
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};
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template <class MockClass>
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class GTEST_INTERNAL_EMPTY_BASE_CLASS NaggyMock
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: private internal::NaggyMockImpl<MockClass>,
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public MockClass {
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static_assert(!internal::HasStrictnessModifier<MockClass>(),
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"Can't apply NaggyMock to a class hierarchy that already has a "
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"strictness modifier. See "
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"https://google.github.io/googletest/"
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"gmock_cook_book.html#NiceStrictNaggy");
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public:
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NaggyMock() : MockClass() {
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static_assert(sizeof(*this) == sizeof(MockClass),
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"The impl subclass shouldn't introduce any padding");
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}
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// Ideally, we would inherit base class's constructors through a using
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// declaration, which would preserve their visibility. However, many existing
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// tests rely on the fact that current implementation reexports protected
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// constructors as public. These tests would need to be cleaned up first.
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// Single argument constructor is special-cased so that it can be
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// made explicit.
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template <typename A>
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explicit NaggyMock(A&& arg) : MockClass(std::forward<A>(arg)) {
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static_assert(sizeof(*this) == sizeof(MockClass),
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"The impl subclass shouldn't introduce any padding");
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}
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template <typename TArg1, typename TArg2, typename... An>
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NaggyMock(TArg1&& arg1, TArg2&& arg2, An&&... args)
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: MockClass(std::forward<TArg1>(arg1), std::forward<TArg2>(arg2),
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std::forward<An>(args)...) {
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static_assert(sizeof(*this) == sizeof(MockClass),
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"The impl subclass shouldn't introduce any padding");
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}
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private:
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GTEST_DISALLOW_COPY_AND_ASSIGN_(NaggyMock);
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};
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template <class MockClass>
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class GTEST_INTERNAL_EMPTY_BASE_CLASS StrictMock
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: private internal::StrictMockImpl<MockClass>,
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public MockClass {
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public:
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static_assert(
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!internal::HasStrictnessModifier<MockClass>(),
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"Can't apply StrictMock to a class hierarchy that already has a "
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"strictness modifier. See "
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"https://google.github.io/googletest/"
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"gmock_cook_book.html#NiceStrictNaggy");
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StrictMock() : MockClass() {
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static_assert(sizeof(*this) == sizeof(MockClass),
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"The impl subclass shouldn't introduce any padding");
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}
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// Ideally, we would inherit base class's constructors through a using
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// declaration, which would preserve their visibility. However, many existing
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// tests rely on the fact that current implementation reexports protected
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// constructors as public. These tests would need to be cleaned up first.
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// Single argument constructor is special-cased so that it can be
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// made explicit.
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template <typename A>
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explicit StrictMock(A&& arg) : MockClass(std::forward<A>(arg)) {
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static_assert(sizeof(*this) == sizeof(MockClass),
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"The impl subclass shouldn't introduce any padding");
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}
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template <typename TArg1, typename TArg2, typename... An>
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StrictMock(TArg1&& arg1, TArg2&& arg2, An&&... args)
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: MockClass(std::forward<TArg1>(arg1), std::forward<TArg2>(arg2),
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std::forward<An>(args)...) {
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static_assert(sizeof(*this) == sizeof(MockClass),
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"The impl subclass shouldn't introduce any padding");
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}
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private:
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GTEST_DISALLOW_COPY_AND_ASSIGN_(StrictMock);
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};
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#undef GTEST_INTERNAL_EMPTY_BASE_CLASS
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} // namespace testing
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#endif // GOOGLEMOCK_INCLUDE_GMOCK_GMOCK_NICE_STRICT_H_
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