diff --git a/cmake/tests.cmake b/cmake/tests.cmake
new file mode 100644
index 0000000..941f33d
--- /dev/null
+++ b/cmake/tests.cmake
@@ -0,0 +1,209 @@
+if (NOT EXISTS "${PROJECT_SOURCE_DIR}/../gmock/CMakeLists.txt")
+  message(FATAL_ERROR "Cannot find gmock directory.")
+endif()
+
+option(protobuf_ABSOLUTE_TEST_PLUGIN_PATH
+  "Using absolute test_plugin path in tests" ON)
+
+include_directories(
+  ${protobuf_source_dir}/gmock
+  ${protobuf_source_dir}/gmock/gtest
+  ${protobuf_source_dir}/gmock/gtest/include
+  ${protobuf_source_dir}/gmock/include
+)
+
+add_library(gmock STATIC
+  ${protobuf_source_dir}/gmock/src/gmock-all.cc
+  ${protobuf_source_dir}/gmock/gtest/src/gtest-all.cc
+)
+add_library(gmock_main STATIC ${protobuf_source_dir}/gmock/src/gmock_main.cc)
+target_link_libraries(gmock_main gmock)
+
+set(lite_test_protos
+  google/protobuf/map_lite_unittest.proto
+  google/protobuf/unittest_import_lite.proto
+  google/protobuf/unittest_import_public_lite.proto
+  google/protobuf/unittest_lite.proto
+  google/protobuf/unittest_no_arena_lite.proto
+)
+
+set(tests_protos
+  google/protobuf/any_test.proto
+  google/protobuf/compiler/cpp/cpp_test_bad_identifiers.proto
+  google/protobuf/compiler/cpp/cpp_test_large_enum_value.proto
+  google/protobuf/map_proto2_unittest.proto
+  google/protobuf/map_unittest.proto
+  google/protobuf/unittest.proto
+  google/protobuf/unittest_arena.proto
+  google/protobuf/unittest_custom_options.proto
+  google/protobuf/unittest_drop_unknown_fields.proto
+  google/protobuf/unittest_embed_optimize_for.proto
+  google/protobuf/unittest_empty.proto
+  google/protobuf/unittest_import.proto
+  google/protobuf/unittest_import_public.proto
+  google/protobuf/unittest_lite_imports_nonlite.proto
+  google/protobuf/unittest_mset.proto
+  google/protobuf/unittest_mset_wire_format.proto
+  google/protobuf/unittest_no_arena.proto
+  google/protobuf/unittest_no_arena_import.proto
+  google/protobuf/unittest_no_field_presence.proto
+  google/protobuf/unittest_no_generic_services.proto
+  google/protobuf/unittest_optimize_for.proto
+  google/protobuf/unittest_preserve_unknown_enum.proto
+  google/protobuf/unittest_preserve_unknown_enum2.proto
+  google/protobuf/unittest_proto3_arena.proto
+  google/protobuf/unittest_well_known_types.proto
+  google/protobuf/util/internal/testdata/anys.proto
+  google/protobuf/util/internal/testdata/books.proto
+  google/protobuf/util/internal/testdata/default_value.proto
+  google/protobuf/util/internal/testdata/default_value_test.proto
+  google/protobuf/util/internal/testdata/field_mask.proto
+  google/protobuf/util/internal/testdata/maps.proto
+  google/protobuf/util/internal/testdata/oneofs.proto
+  google/protobuf/util/internal/testdata/struct.proto
+  google/protobuf/util/internal/testdata/timestamp_duration.proto
+  google/protobuf/util/json_format_proto3.proto
+  google/protobuf/util/message_differencer_unittest.proto
+)
+
+macro(compile_proto_file filename)
+  get_filename_component(dirname ${filename} PATH)
+  get_filename_component(basename ${filename} NAME_WE)
+  add_custom_command(
+    OUTPUT ${protobuf_source_dir}/src/${dirname}/${basename}.pb.cc
+    DEPENDS protoc ${protobuf_source_dir}/src/${dirname}/${basename}.proto
+    COMMAND protoc ${protobuf_source_dir}/src/${dirname}/${basename}.proto
+        --proto_path=${protobuf_source_dir}/src
+        --cpp_out=${protobuf_source_dir}/src
+  )
+endmacro(compile_proto_file)
+
+set(lite_test_proto_files)
+foreach(proto_file ${lite_test_protos})
+  compile_proto_file(${proto_file})
+  string(REPLACE .proto .pb.cc pb_file ${proto_file})
+  set(lite_test_proto_files ${lite_test_proto_files}
+      ${protobuf_source_dir}/src/${pb_file})
+endforeach(proto_file)
+
+set(tests_proto_files)
+foreach(proto_file ${tests_protos})
+  compile_proto_file(${proto_file})
+  string(REPLACE .proto .pb.cc pb_file ${proto_file})
+  set(tests_proto_files ${tests_proto_files}
+      ${protobuf_source_dir}/src/${pb_file})
+endforeach(proto_file)
+
+set(common_test_files
+  ${protobuf_source_dir}/src/google/protobuf/arena_test_util.cc
+  ${protobuf_source_dir}/src/google/protobuf/map_test_util.cc
+  ${protobuf_source_dir}/src/google/protobuf/test_util.cc
+  ${protobuf_source_dir}/src/google/protobuf/testing/file.cc
+  ${protobuf_source_dir}/src/google/protobuf/testing/googletest.cc
+)
+
+set(common_lite_test_files
+  ${protobuf_source_dir}/src/google/protobuf/arena_test_util.cc
+  ${protobuf_source_dir}/src/google/protobuf/map_lite_test_util.cc
+  ${protobuf_source_dir}/src/google/protobuf/test_util_lite.cc
+)
+
+set(tests_files
+  ${protobuf_source_dir}/src/google/protobuf/any_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/arena_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/arenastring_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/command_line_interface_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_bootstrap_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_plugin_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_generator_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/importer_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_doc_comment_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_plugin_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/mock_code_generator.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/objectivec/objectivec_helpers_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/parser_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/python/python_plugin_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/ruby/ruby_generator_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/descriptor_database_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/descriptor_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/drop_unknown_fields_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/dynamic_message_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/extension_set_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/generated_message_reflection_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/io/coded_stream_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/io/printer_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/io/tokenizer_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/io/zero_copy_stream_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/map_field_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/map_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/message_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/no_field_presence_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/preserve_unknown_enum_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/proto3_arena_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/reflection_ops_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/repeated_field_reflection_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/repeated_field_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/bytestream_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/common_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/int128_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/once_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/status_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/statusor_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/stringpiece_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/stringprintf_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/structurally_valid_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/strutil_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/template_util_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/time_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/type_traits_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/text_format_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/unknown_field_set_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/util/field_comparator_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/util/field_mask_util_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/default_value_objectwriter_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/json_objectwriter_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/json_stream_parser_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/protostream_objectsource_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/protostream_objectwriter_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/type_info_test_helper.cc
+  ${protobuf_source_dir}/src/google/protobuf/util/json_util_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/util/message_differencer_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/util/time_util_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/util/type_resolver_util_test.cc
+  ${protobuf_source_dir}/src/google/protobuf/well_known_types_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/wire_format_unittest.cc
+)
+
+if(protobuf_ABSOLUTE_TEST_PLUGIN_PATH)
+  add_compile_options(-DGOOGLE_PROTOBUF_TEST_PLUGIN_PATH="$<TARGET_FILE:test_plugin>")
+endif()
+
+add_executable(tests ${tests_files} ${common_test_files} ${tests_proto_files} ${lite_test_proto_files})
+target_link_libraries(tests libprotoc libprotobuf gmock_main)
+
+set(test_plugin_files
+  ${protobuf_source_dir}/src/google/protobuf/compiler/mock_code_generator.cc
+  ${protobuf_source_dir}/src/google/protobuf/testing/file.cc
+  ${protobuf_source_dir}/src/google/protobuf/testing/file.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/test_plugin.cc
+)
+
+add_executable(test_plugin ${test_plugin_files})
+target_link_libraries(test_plugin libprotoc libprotobuf gmock)
+
+set(lite_test_files
+  ${protobuf_source_dir}/src/google/protobuf/lite_unittest.cc
+)
+add_executable(lite-test ${lite_test_files} ${common_lite_test_files} ${lite_test_proto_files})
+target_link_libraries(lite-test libprotobuf-lite)
+
+set(lite_arena_test_files
+  ${protobuf_source_dir}/src/google/protobuf/lite_arena_unittest.cc
+)
+add_executable(lite-arena-test ${lite_arena_test_files} ${common_lite_test_files} ${lite_test_proto_files})
+target_link_libraries(lite-arena-test libprotobuf-lite gmock_main)
+
+add_custom_target(check
+  COMMAND tests
+  WORKING_DIRECTORY ${protobuf_source_dir})