Cover data increment/decrement/doesn't changed with transition statement

Coverage
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2

In reply to rraa:

Transitions in coverpoints is limited. You can use the $past() sampling function to make it a little easier so you don’t have to declare a separate variable.

covergroup inc_cg @(posedge clk);
inc_cp: coverpoint signal==$past(signal,,,@(posedge clk)+1 {
   bins T = {1};
}

It’s slightly easier using a cover directive

cover property (@(posedge clk) signal == $past(signal)+1;);