rewritten tests to use to_XXX-functions
rewritten tests to use to_XXX-functions

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