diff --git a/CMakeLists.txt b/CMakeLists.txt
index fa8c711..1bd1f0f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,10 +9,11 @@ project(phmap VERSION ${DETECTED_PHMAP_VERSION} LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 11)
 set(PHMAP_HEADERS phmap.h phmap_base.h phmap_bits.h phmap_utils.h phmap_config.h)
 set(PHMAP_DIR parallel_hashmap)
-set(CMAKE_SUPPRESS_REGENERATION true)  ## suppress ZERO_CHECK project
+set(CMAKE_SUPPRESS_REGENERATION true)            ## suppress ZERO_CHECK project
 
 include(GNUInstallDirs)
 include(CMakePackageConfigHelpers)
+include(helpers)
 
 add_library(${PROJECT_NAME} INTERFACE)
 
@@ -38,7 +39,31 @@ option(PHMAP_BUILD_TESTS    "Whether or not to build the tests"    OFF)
 option(PHMAP_BUILD_EXAMPLES "Whether or not to build the examples" OFF)
 
 if (PHMAP_BUILD_TESTS)
-    add_subdirectory(tests)
+    #add_subdirectory(tests)
+    include(cmake/DownloadGTest.cmake)
+
+    check_target(gtest)
+    check_target(gtest_main)
+    check_target(gmock)
+
+    list(APPEND ABSL_TEST_COMMON_LIBRARIES
+         gtest_main
+         gtest
+         gmock
+         ${CMAKE_THREAD_LIBS_INIT}
+    )
+
+absl_cc_test(
+  NAME
+    flat_hash_set_test
+  SRCS
+    "tests/flat_hash_set_test.cc"
+  COPTS
+    "-DUNORDERED_SET_CXX17"
+  DEPS
+    gmock_main
+)
+
 endif()
 
 if (PHMAP_BUILD_EXAMPLES)
diff --git a/cmake/helpers.cmake b/cmake/helpers.cmake
new file mode 100644
index 0000000..b3053e0
--- /dev/null
+++ b/cmake/helpers.cmake
@@ -0,0 +1,57 @@
+#set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+set(ABSL_IDE_FOLDER Abseil)
+
+# absl_cc_test(
+#   NAME
+#     awesome_test
+#   SRCS
+#     "awesome_test.cc"
+#   DEPS
+#     absl::awesome
+#     gmock
+#     gtest_main
+# )
+function(absl_cc_test)
+  cmake_parse_arguments(ABSL_CC_TEST
+    ""
+    "NAME"
+    "SRCS;COPTS;DEFINES;LINKOPTS;DEPS"
+    ${ARGN}
+  )
+
+  set(_NAME "absl_${ABSL_CC_TEST_NAME}")
+  add_executable(${_NAME} "")
+  target_sources(${_NAME} PRIVATE ${ABSL_CC_TEST_SRCS})
+  target_include_directories(${_NAME}
+    PUBLIC ${ABSL_COMMON_INCLUDE_DIRS}
+    PRIVATE ${GMOCK_INCLUDE_DIRS} ${GTEST_INCLUDE_DIRS}
+  )
+  target_compile_definitions(${_NAME}
+    PUBLIC ${ABSL_CC_TEST_DEFINES}
+  )
+  target_compile_options(${_NAME}
+    PRIVATE ${ABSL_CC_TEST_COPTS}
+  )
+  target_link_libraries(${_NAME}
+    PUBLIC ${ABSL_CC_TEST_DEPS}
+    PRIVATE ${ABSL_CC_TEST_LINKOPTS}
+  )
+  # Add all Abseil targets to a a folder in the IDE for organization.
+  set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}/test)
+
+  set_property(TARGET ${_NAME} PROPERTY CXX_STANDARD ${ABSL_CXX_STANDARD})
+  set_property(TARGET ${_NAME} PROPERTY CXX_STANDARD_REQUIRED ON)
+
+  add_test(NAME ${_NAME} COMMAND ${_NAME})
+endfunction()
+
+
+
+function(check_target my_target)
+  if(NOT TARGET ${my_target})
+    message(FATAL_ERROR " ABSL: compiling absl requires a ${my_target} CMake target in your project,
+                   see CMake/README.md for more details")
+  endif(NOT TARGET ${my_target})
+endfunction()
+
+