BUG: fix test to list generate dheader

Tests/CustomCommand/CMakeLists.txt

@@ -142,6 +142,7 @@ ADD_CUSTOM_COMMAND(OUTPUT ${PROJECT_BINARY_DIR}/foo.c
 
 # add the library
 ADD_EXECUTABLE(CustomCommand 
+  ${PROJECT_BINARY_DIR}/foo.h
   ${PROJECT_BINARY_DIR}/foo.c
   ${PROJECT_BINARY_DIR}/wrapped.c
   ${PROJECT_BINARY_DIR}/generated.c

Tests/CustomCommand/GeneratedHeader/CMakeLists.txt

@@ -9,5 +9,5 @@ ADD_CUSTOM_COMMAND(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/generated.h
   ${CMAKE_CURRENT_BINARY_DIR}/generated.h 
 )
 
-ADD_LIBRARY(GeneratedHeader main.cpp) 
+ADD_LIBRARY(GeneratedHeader main.cpp ${CMAKE_CURRENT_BINARY_DIR}/generated.h)