execute it like ./test.sh 4 4000 testcase0.conf to obtain a successful execution

updating mock. It now wraps the calls to sync and reads config from configuration file.
I believe it's better not to use the preprocessor directive, i.e. not to put any test code in the engine_tcp. I just call the mock in the test_allreduce file. It's a file purely for testing purposes, so it's fine to use the mock there.

test/Makefile

@@ -9,10 +9,6 @@ ifeq ($(no_omp),1)
 else 
 	CFLAGS += -fopenmp
 endif
-ifeq ($(test),1)
-	CFLAGS += -DTEST
-endif
-
 
 # specify tensor path
 BIN = test_allreduce