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Add static_asserts that verify that no class hierarchy contains more than one
of {NiceMock, NaggyMock, StrictMock}. This sort of nesting has always been
disallowed, but this CL adds a compile-time check to prevent it.

PiperOrigin-RevId: 347037822
This commit is contained in:
Abseil Team 2020-12-11 14:20:17 -05:00 committed by Andy Getz
parent 5a509dbd2e
commit 18f8200e30
1 changed files with 43 additions and 28 deletions
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71
googlemock/include/gmock/gmock-nice-strict.h
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@ -63,14 +63,44 @@
#ifndef GMOCK_INCLUDE_GMOCK_GMOCK_NICE_STRICT_H_
#define GMOCK_INCLUDE_GMOCK_GMOCK_NICE_STRICT_H_
#include <type_traits>
#include "gmock/gmock-spec-builders.h"
#include "gmock/internal/gmock-port.h"
namespace testing {
template <class MockClass>
class NiceMock;
template <class MockClass>
class NaggyMock;
template <class MockClass>
class StrictMock;
namespace internal {
template <typename T>
std::true_type StrictnessModifierProbe(const NiceMock<T>&);
template <typename T>
std::true_type StrictnessModifierProbe(const NaggyMock<T>&);
template <typename T>
std::true_type StrictnessModifierProbe(const StrictMock<T>&);
std::false_type StrictnessModifierProbe(...);
template <typename T>
constexpr bool HasStrictnessModifier() {
return decltype(StrictnessModifierProbe(std::declval<const T&>()))::value;
}
} // namespace internal
template <class MockClass>
class NiceMock : public MockClass {
public:
static_assert(
!internal::HasStrictnessModifier<MockClass>(),
"Can't apply NiceMock to a class hierarchy that already has a "
"strictness modifier. See "
"https://github.com/google/googletest/blob/master/googlemock/docs/"
"cook_book.md#the-nice-the-strict-and-the-naggy-nicestrictnaggy");
NiceMock() : MockClass() {
::testing::Mock::AllowUninterestingCalls(
internal::ImplicitCast_<MockClass*>(this));
@ -108,6 +138,13 @@ class NiceMock : public MockClass {
template <class MockClass>
class NaggyMock : public MockClass {
static_assert(
!internal::HasStrictnessModifier<MockClass>(),
"Can't apply NaggyMock to a class hierarchy that already has a "
"strictness modifier. See "
"https://github.com/google/googletest/blob/master/googlemock/docs/"
"cook_book.md#the-nice-the-strict-and-the-naggy-nicestrictnaggy");
public:
NaggyMock() : MockClass() {
::testing::Mock::WarnUninterestingCalls(
@ -147,6 +184,12 @@ class NaggyMock : public MockClass {
template <class MockClass>
class StrictMock : public MockClass {
public:
static_assert(
!internal::HasStrictnessModifier<MockClass>(),
"Can't apply StrictMock to a class hierarchy that already has a "
"strictness modifier. See "
"https://github.com/google/googletest/blob/master/googlemock/docs/"
"cook_book.md#the-nice-the-strict-and-the-naggy-nicestrictnaggy");
StrictMock() : MockClass() {
::testing::Mock::FailUninterestingCalls(
internal::ImplicitCast_<MockClass*>(this));
@ -182,34 +225,6 @@ class StrictMock : public MockClass {
GTEST_DISALLOW_COPY_AND_ASSIGN_(StrictMock);
};
// The following specializations catch some (relatively more common)
// user errors of nesting nice and strict mocks. They do NOT catch
// all possible errors.
// These specializations are declared but not defined, as NiceMock,
// NaggyMock, and StrictMock cannot be nested.
template <typename MockClass>
class NiceMock<NiceMock<MockClass> >;
template <typename MockClass>
class NiceMock<NaggyMock<MockClass> >;
template <typename MockClass>
class NiceMock<StrictMock<MockClass> >;
template <typename MockClass>
class NaggyMock<NiceMock<MockClass> >;
template <typename MockClass>
class NaggyMock<NaggyMock<MockClass> >;
template <typename MockClass>
class NaggyMock<StrictMock<MockClass> >;
template <typename MockClass>
class StrictMock<NiceMock<MockClass> >;
template <typename MockClass>
class StrictMock<NaggyMock<MockClass> >;
template <typename MockClass>
class StrictMock<StrictMock<MockClass> >;
} // namespace testing
#endif // GMOCK_INCLUDE_GMOCK_GMOCK_NICE_STRICT_H_