Enable Google Test's GMOCK feature (#1773)

[ROCm/rccl commit: a28d5cb986]

projects/rccl/cmake/Dependencies.cmake

@@ -62,16 +62,21 @@ if(NOT GTest_FOUND AND BUILD_TESTS OR INSTALL_DEPENDENCIES)
                      UPDATE_DISCONNECTED TRUE
     )
     set(GTEST_INCLUDE_DIRS ${CMAKE_CURRENT_BINARY_DIR}/gtest/include CACHE PATH "")
+    set(GMOCK_INCLUDE_DIRS ${CMAKE_CURRENT_BINARY_DIR}/gmock/include CACHE PATH "")
     if(EXISTS ${CMAKE_CURRENT_BINARY_DIR}/gtest/lib)
         set(GTEST_BOTH_LIBRARIES ${CMAKE_CURRENT_BINARY_DIR}/gtest/lib/libgtest.a;${CMAKE_CURRENT_BINARY_DIR}/gtest/lib/libgtest_main.a CACHE PATH "")
+        set(GMOCK_BOTH_LIBRARIES ${CMAKE_CURRENT_BINARY_DIR}/gtest/lib/libgmock.a;${CMAKE_CURRENT_BINARY_DIR}/gtest/lib/libgmock_main.a CACHE PATH "")
     elseif(EXISTS ${CMAKE_CURRENT_BINARY_DIR}/gtest/lib64)
         set(GTEST_BOTH_LIBRARIES ${CMAKE_CURRENT_BINARY_DIR}/gtest/lib64/libgtest.a;${CMAKE_CURRENT_BINARY_DIR}/gtest/lib64/libgtest_main.a CACHE PATH "")
+        set(GMOCK_BOTH_LIBRARIES ${CMAKE_CURRENT_BINARY_DIR}/gtest/lib64/libgmock.a;${CMAKE_CURRENT_BINARY_DIR}/gtest/lib64/libgmock_main.a CACHE PATH "")
     else()
         message(FATAL_ERROR "Cannot find gtest library installation path.")
     find_package(GTest REQUIRED CONFIG PATHS ${GTEST_ROOT})
+    find_package(GMock REQUIRED CONFIG PATHS ${GTEST_ROOT})
     endif()
 elseif(GTest_FOUND AND BUILD_TESTS)
-  set(GTEST_BOTH_LIBRARIES "GTest::gtest;GTest::gtest_main")
+    set(GTEST_BOTH_LIBRARIES "GTest::gtest;GTest::gtest_main")
+    set(GMOCK_BOTH_LIBRARIES "GTest::gmock;GTest::gmock_main")
 endif()
 
 # Find or download/install rocm-cmake project