test: added test for add
test: added test for add

dinfuehr/dora,riginding/dora,riginding/dora,dinfuehr/dora,riginding/dora,riginding/dora,riginding/dora,riginding/dora,dinfuehr/dora,riginding/dora,dinfuehr/dora,dinfuehr/dora,dinfuehr/dora