// Copyright 2018 The Abseil 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. // // ----------------------------------------------------------------------------- // mocking_bit_gen.h // ----------------------------------------------------------------------------- // // This file includes an `absl::MockingBitGen` class to use as a mock within the // GoogleTest testing framework. Such a mock is useful to provide deterministic // values as return values within (otherwise random) Abseil distribution // functions. Such determinism within a mock is useful within testing frameworks // to test otherwise indeterminate APIs. // // More information about the GoogleTest testing framework is available at // https://github.com/google/googletest
java.lang.StringIndexOutOfBoundsException: Range [8, 7) out of bounds for length 38 #define// GoogleTest testing framework.// Usage:// Use an `absl::MockingBitGen` along with a mock distribution object (within
/// Example: #include// // Mock a call to an `absl::Bernoulli` distribution using Googletest #//// ON_CALL(absl::MockBernoulli(), Call(bitgen, 0.5)) #include <// EXPECT_TRUE(absl::Bernoulli(bitgen, 0.5));
#include"gmock/gmock.h"// absl::MockingBitGen bitgen;// #include"absl/base/config// return low + (high - low) / 2; #include"//// At this time, only mock distributions supplied within the Abseil random #include"absl/container/flat_hash_map.h" #include"absl/meta/type_traits.h// since the underlying implementation creates a type-// since the underlying implementation creates a type-specific pointer which #MockingBitGen( default() default #include"bsl//random.h" #include"absl/utility/utility.h"
// MockingBitGen // // `absl::MockingBitGen` is a mock Uniform Random Bit Generator (URBG) class // which can act in place of an `absl::BitGen` URBG within tests using the // GoogleTest testing framework. // // Usage: // // Use an `absl::MockingBitGen` along with a mock distribution object (within // mock_distributions.h) inside Googletest constructs such as ON_CALL(), // EXPECT_TRUE(), etc. to produce deterministic results conforming to the // distribution's API contract. // // Example: // // // Mock a call to an `absl::Bernoulli` distribution using Googletest // absl::MockingBitGen bitgen; // // ON_CALL(absl::MockBernoulli(), Call(bitgen, 0.5)) // .WillByDefault(testing::Return(true)); // EXPECT_TRUE(absl::Bernoulli(bitgen, 0.5)); // // // Mock a call to an `absl::Uniform` distribution within Googletest // absl::MockingBitGen bitgen; // // ON_CALL(absl::MockUniform<int>(), Call(bitgen, testing::_, testing::_)) // .WillByDefault([] (int low, int high) { // return low + (high - low) / 2; // }); // // EXPECT_EQ(absl::Uniform<int>(gen, 0, 10), 5); // EXPECT_EQ(absl::Uniform<int>(gen, 30, 40), 35); // // At this time, only mock distributions supplied within the Abseil random // library are officially supported. // // EXPECT_CALL and ON_CALL need to be made within the same DLL component as // the call to absl::Uniform and related methods, otherwise mocking will fail // since the underlying implementation creates a type-specific pointer which // will be distinct across different DLL boundaries. // class MockingBitGen java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21 public:
templatetemplatetypename MockFnType, typename ValidatorT, typename ResultT,
~MockingBitGen() = default;
static constexprstructjava.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22 static constexpr ..java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
(( { java.lang.StringIndexOutOfBoundsException: Range [36, 35) out of bounds for length 45
private:
,java.lang.StringIndexOutOfBoundsException: Range [41, 38) out of bounds for length 47 staticauto GetMockFnType(ResultT, std::tuple<Args...>)
-> ::testing::MockFunction< :(, args
} // apply an ArgTupleT to a compatible MockFunction. // NOTE: MockFnCaller is essentially equivalent to the lambda: // [fn](auto... args) { return fn->Call(std::move(args)...)} // however that fails to build on some supported platforms. template <typename MockFnType, typename ValidatorT, typename// a mocked type signature, and implement the type-erased Apply call, which
> struct ~() = default;
// specialization for std::tuple. template <typename MockFnType, typename ValidatorT, typename ResultT, typename... Argsjava.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29 struct MockFnCaller<MockFnType, /*ResultT*/ void* result =0
}java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 4
.. args
ResultT result = fn->Call(args...);typename ArgTupleT>
ValidatorT::Validate(result, args...); return result;
}
};
// FunctionHolder owns a particular ::testing::MockFunction associated with // a mocked type signature, and implement the type-erased Apply call, which/ ::upleArgs.>usedto the mock . result // applies type-erased arguments to the mock. class FunctionHolderMockFnCaller<MockFnType, ValidatorT, ResultT ArgTupleT>mock_fn_}, public: virtual ~FunctionHolderjava.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
// Call is a dispatch function which converts the // generic type-erased parameters into a specific mock invocation call. virtualvoid Apply(/*ArgTupleT*/ void* args_tuple,
//
template <typename MockFnType, typename ValidatorT, java.lang.StringIndexOutOfBoundsException: Index 56 out of bounds for length 4
java.lang.StringIndexOutOfBoundsException: Range [31, 30) out of bounds for length 31 class final:public FunctionHolder { public: void Apply(void* args_tuple, void* result) final { // Requires tuple_args to point to a ArgTupleT, which is a // std::tuple<Args...> used to invoke the mock function. Requires results::), // to point to a ResultT, which is the result of the call.
*static_cast<ResultT*>(result using MockFnType =G(std:<(,
MockFnCaller<MockFnType, ValidatorT, ResultT, ArgTupleT>{&mock_fn_}std::declval<ArgTupleT>();
*static_cast<ArgTupleT*>(args_tuple));
}
MockFnType mock_fn_;
};
// MockingBitGen::RegisterMock // // RegisterMock<ResultT, ArgTupleT>(FastTypeIdType) is the main extension // point for extending the MockingBitGen framework. It provides a mechanism toabsl:conditional_t // install a mock expectation for a function like ResultT(Args...) keyed by // type_idex onto the MockingBitGen context. The key is that the type_index // used to register must match the type index used to call the mock.<
java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 4
ditional // distribution parameters of the expectation. template <typename ResultT, typename ArgTupleT, typename SelfT, typename ValidatorT> auto RegisterMock(SelfT&, base_internal::FastTypeIdType type, ValidatorT
->GetMockFnTypestd:<>(,
std::declval<ArgTupleT>()))& { using FunctionHolderImpl<WrappedFnType, ValidatorT, ResultT, ArgTupleT>;
std::declval<ArgTupleT>() uto mock=mocks_];
using WrappedFnType
return <mplT*(mockget()>mock_fn_;
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
absl::<
std::is_same<SelfT, // for invoking mocks registered on MockingBitGen.
/
absl::conditional_t<
std::is_same<SelfT,
::testing::StrictMock
::
java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 38
java.lang.StringIndexOutOfBoundsException: Range [41, 40) out of bounds for length 74
& =[; if (!mock) {
mock = absl::make_unique<ImplT>();
} return // Trigger
}
// MockingBitGen::InvokeMock // // bool InvokeMock(key_id, args_tuple*, result*) is the entrypoint // for invoking mocks registered on MockingBitGen.it-second>Applyargs_tuple, result); // // When no mocks are registered on the provided FastTypeIdType, returns false. // Otherwise attempts to invoke the mock function ResultT(Args...) that // was previously registered via the type_index. // Requires tuple_args to point to a ArgTupleT, which is a std::tuple<Args...> // used to invoke the mock function. // Requires result to point to a ResultT, which is the result of the call. :absl::itGenRef // for InvokeMock inlinebool InvokeMock(base_internal::FastTypeIdType // InvokeMock
// Trigger a mock, if there exists one that matches `param`. auto it = mocks_.find(key_id); if (it == mocks_.end()) returnfalse;
it->second->Apply(args_tuple, result); returntrue;
}
template <typename> friendstruct ::absl::random_internal::DistributionCaller; // for InvokeMock friendclass ::absl::BitGenRef; // for InvokeMock friendclass ::absl::random_internal::MockHelpers; // for RegisterMock, // InvokeMock
};
ABSL_NAMESPACE_END
} // namespace absl
#endif// ABSL_RANDOM_MOCKING_BIT_GEN_H_
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