gmock-nice-strict.h

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// Implements class templates NiceMock, NaggyMock, and StrictMock.
//
// Given a mock class MockFoo that is created using Google Mock,
// NiceMock<MockFoo> is a subclass of MockFoo that allows
// uninteresting calls (i.e. calls to mock methods that have no
// EXPECT_CALL specs), NaggyMock<MockFoo> is a subclass of MockFoo
// that prints a warning when an uninteresting call occurs, and
// StrictMock<MockFoo> is a subclass of MockFoo that treats all
// uninteresting calls as errors.
//
// Currently a mock is naggy by default, so MockFoo and
// NaggyMock<MockFoo> behave like the same.  However, we will soon
// switch the default behavior of mocks to be nice, as that in general
// leads to more maintainable tests.  When that happens, MockFoo will
// stop behaving like NaggyMock<MockFoo> and start behaving like
// NiceMock<MockFoo>.
//
// NiceMock, NaggyMock, and StrictMock "inherit" the constructors of
// their respective base class.  Therefore you can write
// NiceMock<MockFoo>(5, "a") to construct a nice mock where MockFoo
// has a constructor that accepts (int, const char*), for example.
//
// A known limitation is that NiceMock<MockFoo>, NaggyMock<MockFoo>,
// and StrictMock<MockFoo> only works for mock methods defined using
// the MOCK_METHOD* family of macros DIRECTLY in the MockFoo class.
// If a mock method is defined in a base class of MockFoo, the "nice"
// or "strict" modifier may not affect it, depending on the compiler.
// In particular, nesting NiceMock, NaggyMock, and StrictMock is NOT
// supported.

// GOOGLETEST_CM0002 DO NOT DELETE

#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));
  }

  // Ideally, we would inherit base class's constructors through a using
  // declaration, which would preserve their visibility. However, many existing
  // tests rely on the fact that current implementation reexports protected
  // constructors as public. These tests would need to be cleaned up first.

  // Single argument constructor is special-cased so that it can be
  // made explicit.
  template <typename A>
  explicit NiceMock(A&& arg) : MockClass(std::forward<A>(arg)) {
    ::testing::Mock::AllowUninterestingCalls(
        internal::ImplicitCast_<MockClass*>(this));
  }

  template <typename TArg1, typename TArg2, typename... An>
  NiceMock(TArg1&& arg1, TArg2&& arg2, An&&... args)
      : MockClass(std::forward<TArg1>(arg1), std::forward<TArg2>(arg2),
                  std::forward<An>(args)...) {
    ::testing::Mock::AllowUninterestingCalls(
        internal::ImplicitCast_<MockClass*>(this));
  }

  ~NiceMock() {  // NOLINT
    ::testing::Mock::UnregisterCallReaction(
        internal::ImplicitCast_<MockClass*>(this));
  }

 private:
  GTEST_DISALLOW_COPY_AND_ASSIGN_(NiceMock);
};

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(
        internal::ImplicitCast_<MockClass*>(this));
  }

  // Ideally, we would inherit base class's constructors through a using
  // declaration, which would preserve their visibility. However, many existing
  // tests rely on the fact that current implementation reexports protected
  // constructors as public. These tests would need to be cleaned up first.

  // Single argument constructor is special-cased so that it can be
  // made explicit.
  template <typename A>
  explicit NaggyMock(A&& arg) : MockClass(std::forward<A>(arg)) {
    ::testing::Mock::WarnUninterestingCalls(
        internal::ImplicitCast_<MockClass*>(this));
  }

  template <typename TArg1, typename TArg2, typename... An>
  NaggyMock(TArg1&& arg1, TArg2&& arg2, An&&... args)
      : MockClass(std::forward<TArg1>(arg1), std::forward<TArg2>(arg2),
                  std::forward<An>(args)...) {
    ::testing::Mock::WarnUninterestingCalls(
        internal::ImplicitCast_<MockClass*>(this));
  }

  ~NaggyMock() {  // NOLINT
    ::testing::Mock::UnregisterCallReaction(
        internal::ImplicitCast_<MockClass*>(this));
  }

 private:
  GTEST_DISALLOW_COPY_AND_ASSIGN_(NaggyMock);
};

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));
  }

  // Ideally, we would inherit base class's constructors through a using
  // declaration, which would preserve their visibility. However, many existing
  // tests rely on the fact that current implementation reexports protected
  // constructors as public. These tests would need to be cleaned up first.

  // Single argument constructor is special-cased so that it can be
  // made explicit.
  template <typename A>
  explicit StrictMock(A&& arg) : MockClass(std::forward<A>(arg)) {
    ::testing::Mock::FailUninterestingCalls(
        internal::ImplicitCast_<MockClass*>(this));
  }

  template <typename TArg1, typename TArg2, typename... An>
  StrictMock(TArg1&& arg1, TArg2&& arg2, An&&... args)
      : MockClass(std::forward<TArg1>(arg1), std::forward<TArg2>(arg2),
                  std::forward<An>(args)...) {
    ::testing::Mock::FailUninterestingCalls(
        internal::ImplicitCast_<MockClass*>(this));
  }

  ~StrictMock() {  // NOLINT
    ::testing::Mock::UnregisterCallReaction(
        internal::ImplicitCast_<MockClass*>(this));
  }

 private:
  GTEST_DISALLOW_COPY_AND_ASSIGN_(StrictMock);
};

}  // namespace testing

#endif  // GMOCK_INCLUDE_GMOCK_GMOCK_NICE_STRICT_H_