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entity tb_bnot is end tb_bnot; architecture behav of tb_bnot is signal i : bit; signal o : bit; begin dut: entity work.bnot port map (i, o); process begin i <= '0'; wait for 1 ns; assert o = '1' severity failure; i <= '1'; wait for 1 ns; assert o = '0' severity failure; wait; end process; end behav;