'Google Mock' mocks generator based on libclang
Switch branches/tags
Nothing to show
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.
clang @ eea0425


Google Mock mocks generator based on libclang

Code Health



git clone --recursive git@github.com:krzysztof-jusiak/gmock.git


Usage: gmock.py [options] files...

  -h, --help                show this help message and exit
  -c FILE, --config=FILE    config FILE (default='gmock.conf')
  -d DIR, --dir=DIR         dir for generated mocks (default='.')
  -l LIMIT, --limit=LIMIT   limit to interfaces within declaration (default='')


./gmock.py file.hpp

will create mocks files in current directory for all interfaces

./gmock.py -c "gmock.conf" -d "test/mocks" -l "namespace::class" file1.hpp file2.hpp

will create directory 'test/mocks' and mocks files within this directory for all interfaces (contains at least one pure virtual function) which will be within 'namespace::class' declaration

./gmock.py -d "test/mocks" file1.hpp file2.hpp -- -D PROJECT -Iproject/include

'--' separates arguments between script and compiler

Integration with the build system

find project -iname "*.h" -or -iname "*.hpp" | xargs "project/externals/gmock.py"   \
    -c "project/conf/gmock.conf"                                                    \
    -d "project/test/mocks"                                                         \
    -l "Project"                                                                    \
    --                                                                              \
    -D PROJECT                                                                      \
    -Iproject/include                                                               \


  • it's reliable (based on clang compiler)
  • it's fast (tested on project ~200 kloc -> generation of mocs takes 3-5s on common laptop)
  • output file might be easily adopted to the project via configuration file
  • easy integration with the project build system -> generate mocks files for each interface from given files limited to the project (for example via project namespace)
  • able to generate cpp files with default constructors (to speed up compilation times)
  • generate pretty output (one mock per file)
  • mocking class templates
  • easy to extend (~300 lines of code)
  • handle c++ operators
    virtual int operator()(int, double) = 0;
    virtual int operator()(int arg0, double arg1) { return call_operator(arg0, arg1); }
    MOCK_METHOD2(call_operator, int(int, double));

Configuration file

#possible variables:
# file: interface file name
# dir: interface directory
# guard: header guard
# template: template parameters
# template_interface: template interface class
# interface: interface class
# mock_methods: generated gmock methods
# generated_dir: generated directory
# mock_file_hpp: mock header file
# mock_file_cpp: mock source file

mock_file_hpp = "%(interface)sMock.hpp"

file_template_hpp = """\
 * file generated by gmock: %(mock_file_hpp)s
#ifndef %(guard)s
#define %(guard)s

#include <gmock/gmock.h>
#include "%(dir)s/%(file)s"


%(template)sclass %(interface)sMock : public %(template_interface)s


#endif // %(guard)s


mock_file_cpp = ""
file_template_cpp = ""

Example of generated output

 * file generated by gmock: I2Mock.hpp
#ifndef I2MOCK_HPP
#define I2MOCK_HPP

#include <gmock/gmock.h>
#include "I2.hpp"

namespace n {

class I2Mock : public I2
    MOCK_CONST_METHOD0(f0, void());
    MOCK_METHOD1(f1, void(int));
    MOCK_METHOD1(f2, void(double));
    MOCK_METHOD2(f3, void(int, double));
    MOCK_METHOD3(f4, void(int, double, const std::string &));
    MOCK_METHOD1(f5, int(const std::string &));
    MOCK_CONST_METHOD1(f6, boost::shared_ptr<int>(const boost::shared_ptr<int> &));
    MOCK_CONST_METHOD0(f7, const int&());
    MOCK_METHOD0(f8, boost::function<void(int)>());
    MOCK_CONST_METHOD1(f9, boost::non_type<int,0>(const boost::non_type<int, 1> &));
    MOCK_METHOD0(f10, const int*const ());
    MOCK_METHOD0(f11, const void());
    virtual int operator()() { return function_call_or_cast_operator(); }
    MOCK_METHOD0(function_call_or_cast_operator, int());

} // namespace n

#endif // I2MOCK_HPP
 * file generated by gmock: TMock.hpp
#ifndef TMOCK_HPP
#define TMOCK_HPP

#include <gmock/gmock.h>
#include "T.hpp"

namespace n {

template<typename Elem>
class TMock : public T<Elem>
    MOCK_CONST_METHOD0_T(GetSize, int());
    MOCK_METHOD1_T(Push, void(const Elem &));

} // namespace n

#endif // TMOCK_HPP


Distributed under the Boost Software License, Version 1.0.