How do you stop MySQL on a Mac OS install?

I installed MySQL via MacPorts. What is the command I need to stop the server (I need to test how my application behave when MySQL is dead)?

There are different cases depending on whether you installed MySQL with the official binary installer, using MacPorts, or using Homebrew:

Homebrew

brew services start mysql
brew services stop mysql
brew services restart mysql

MacPorts

sudo port load mysql57-server
sudo port unload mysql57-server

Note: this is persistent after a reboot.

Binary installer

sudo /Library/StartupItems/MySQLCOM/MySQLCOM stop
sudo /Library/StartupItems/MySQLCOM/MySQLCOM start
sudo /Library/StartupItems/MySQLCOM/MySQLCOM restart

For those who used homebrew to install MySQL use the following commands below to start, stop, or restart MySQL

Brew start

/usr/local/bin/mysql.server start

Brew restart

/usr/local/bin/mysql.server restart

Brew stop

/usr/local/bin/mysql.server stop