added texttests fixture to cpp version

cpp/test/cpp_texttest/CMakeLists.txt

@@ -0,0 +1,15 @@
+set(TEST_NAME GildedRoseTextTests)
+add_executable(${TEST_NAME} GildedRoseTextTests.cc)
+target_sources(${TEST_NAME} PRIVATE GildedRoseTextTests.cc)
+target_link_libraries(${TEST_NAME} lib src)
+set_property(TARGET ${TEST_NAME} PROPERTY CXX_STANDARD 11)
+add_test(NAME ${TEST_NAME} COMMAND ${TEST_NAME})
+
+# Set compiler option /FC for Visual Studio to to make the __FILE__ macro expand to full path.
+# The __FILE__ macro is used by Catch2 to get the path to current test file.
+# Links:
+# * https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=vs-2019
+# * https://docs.microsoft.com/en-us/cpp/build/reference/fc-full-path-of-source-code-file-in-diagnostics?view=vs-2019
+if (MSVC)
+    target_compile_options(${TEST_NAME} PRIVATE "/FC")
+endif()