Integrate single header file CppUnitTestFramework for unittests

server/cmake/DiscoverCppUnitTests.cmake

@@ -0,0 +1,68 @@
+if(NOT DEFINED TEST_EXECUTABLE OR TEST_EXECUTABLE STREQUAL "")
+    message(FATAL_ERROR "TEST_EXECUTABLE is required")
+endif()
+
+if(NOT DEFINED TEST_WORKING_DIR OR TEST_WORKING_DIR STREQUAL "")
+    message(FATAL_ERROR "TEST_WORKING_DIR is required")
+endif()
+
+if(NOT DEFINED CTEST_FILE OR CTEST_FILE STREQUAL "")
+    message(FATAL_ERROR "CTEST_FILE is required")
+endif()
+
+if(NOT DEFINED TEST_PREFIX)
+    set(TEST_PREFIX "")
+endif()
+
+execute_process(
+    COMMAND "${TEST_EXECUTABLE}" --discover_tests --adapter_info
+    WORKING_DIRECTORY "${TEST_WORKING_DIR}"
+    RESULT_VARIABLE _discover_result
+    OUTPUT_VARIABLE _discover_output
+    ERROR_VARIABLE _discover_error
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+
+if(NOT _discover_result EQUAL 0)
+    string(JOIN "\n" _discover_failure
+        "Failed to discover tests from ${TEST_EXECUTABLE}"
+        "Exit code: ${_discover_result}"
+        "stderr:"
+        "${_discover_error}")
+    message(FATAL_ERROR "${_discover_failure}")
+endif()
+
+string(REPLACE "\r\n" "\n" _discover_output "${_discover_output}")
+string(REPLACE "\r" "\n" _discover_output "${_discover_output}")
+
+file(WRITE "${CTEST_FILE}"
+    "# Generated by DiscoverCppUnitTests.cmake. Do not edit.\n")
+
+if(_discover_output)
+    string(REPLACE "\n" ";" _discover_lines "${_discover_output}")
+    set(_discovered_ctest_names)
+    foreach(_discover_line IN LISTS _discover_lines)
+        if(_discover_line STREQUAL "")
+            continue()
+        endif()
+
+        if(NOT _discover_line MATCHES "^([^,]+),(.*),([0-9]+)$")
+            message(FATAL_ERROR
+                "Unexpected test discovery output from ${TEST_EXECUTABLE}: ${_discover_line}")
+        endif()
+
+        set(_test_keyword "${CMAKE_MATCH_1}")
+        string(REPLACE "::" "." _test_suffix "${_test_keyword}")
+        set(_ctest_name "${TEST_PREFIX}${_test_suffix}")
+
+        list(FIND _discovered_ctest_names "${_ctest_name}" _existing_index)
+        if(NOT _existing_index EQUAL -1)
+            message(FATAL_ERROR "Duplicate discovered test name: ${_ctest_name}")
+        endif()
+
+        file(APPEND "${CTEST_FILE}"
+            "add_test([==[${_ctest_name}]==] [==[${TEST_EXECUTABLE}]==] [==[${_test_keyword}]==])\n"
+            "set_tests_properties([==[${_ctest_name}]==] PROPERTIES WORKING_DIRECTORY [==[${TEST_WORKING_DIR}]==])\n")
+        list(APPEND _discovered_ctest_names "${_ctest_name}")
+    endforeach()
+endif()