HashMap: add assertion
HashMap: add assertion

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