Add tests README with instructions on testing

tests/README.md

@@ -0,0 +1,30 @@
+### Requirements ###
+Tests must be run inside a virtual machine. This is for your own safety, as the tests may create and destroy zpools etc.
+
+A VM with 35GB of storage and 8 cores completes the tests in about 5 hours.  
+
+#### Packages ####
+The tests require the following packages to be installed in the VM (Ubuntu 20.04 package names are used, translate as appropriate):
+```
+zfsutils-linux
+libconfig-inifiles-perl
+libcapture-tiny-perl
+```
+```
+apt install zfsutils-linux libconfig-inifiles-perl libcapture-tiny-perl
+```
+
+#### Install sanoid within the VM ####
+Install sanoid within the VM, for example
+```
+apt install git
+git clone https://github.com/jimsalterjrs/sanoid.git
+mkdir /etc/sanoid/
+cp sanoid/sanoid.defaults.conf /etc/sanoid/
+```
+
+### Run the tests ##
+```
+cd sanoid/tests/
+./run-tests.sh
+```

tests/run-tests.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# run's all the available tests
+# runs all the available tests
 
 for test in */; do
     if [ ! -x "${test}/run.sh" ]; then