Simple example for README.md

We once discussed that a very simple example would be more appropriate to be in the README.md.

import random
import cocotb
from cocotb.clock import Clock
from cocotb.triggers import FallingEdge

@cocotb.test()
async def test_simple_dff(dut):
    cocotb.fork(Clock(dut.c, 10, "us").start())

    for i in range(10):
        val = random.randint(0, 1)
        dut.d <= val
        await FallingEdge(dut.c)
        assert dut.q == val, "output was incorrect on the {}th cycle".format(i)

[eric-wieser]

Perhaps with an assert?

import random
import cocotb
from cocotb.clock import Clock
from cocotb.triggers import RisingEdge, FallingEdge

@cocotb.test()
async def test_simple_dff(dut):
    cocotb.fork(Clock(dut.c, 10, "us").start())

    for i in range(10):
        val = random.randint(0, 1)
        dut.d <= val
        await RisingEdge(dut.c)
        await FallingEdge(dut.c)
        assert dut.q == val, f"output was incorrect on the {i}th cycle"

[cmarqu]

I actually do like mentioning the specific cycle, but it would have to be written as e.g.

assert dut.q == val, "output was incorrect on the {}th cycle".format(i)