Use filenames as a definitive answer (#2006)

* Separate find_by_extension and find_by_filename
find_by_extension now takes a path as argument and not only the file extension.
Currently only find_by_extension is used as a strategy.

* Add find_by_filename as first strategy

test/fixtures/CMake/CMakeLists.txt

@@ -0,0 +1,29 @@
+cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
+
+project("To do list")
+
+enable_testing()
+
+if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR
+    "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+    set(warnings "-Wall -Wextra -Werror")
+elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
+    set(warnings "/W4 /WX /EHsc")	
+endif()
+
+set(optimize "-O2")
+
+if (NOT CONFIGURED_ONCE)
+    set(CMAKE_CXX_FLAGS "${warnings} ${optimize}"
+        CACHE STRING "Flags used by the compiler during all build types." FORCE)
+    set(CMAKE_C_FLAGS   "${warnings} ${optimize}"
+        CACHE STRING "Flags used by the compiler during all build types." FORCE)
+endif()
+
+
+add_executable(toDo main.cpp ToDo.cpp)
+
+add_test(toDoTest toDo)
+
+set(CONFIGURED_ONCE TRUE CACHE INTERNAL
+    "A flag showing that CMake has configured at least once.")