I know that If the gas price is high enough, the transaction will be executed sooner since miners will execute transactions with the highest gas price first.
does this rule really apply in the Ropsten testnet, do miners take a fee to mine blocks in such testnet?
In fact, I made the same transaction using a gas price = 0.000000001 (1 Gwei)and gas price = 0.00000002(20 Gwei) and I did not notice a difference in the execution time. In the opposite, sometimes the transaction with 20Gwei take much more time to be executed