Added a functional test. (#58)

This is a little messy -- it's a bash script with some outside
dependencies, and it makes assumptions about the capabilities of the
environment that it's being run in. But it does basically work, and
provides contributors with some basic reassurance that they have built
a working snap.

tests/basic-test.sh

@@ -0,0 +1,51 @@
+#!/bin/bash
+
+set -ex
+
+# Dependencies. TODO: move these into a testing harness
+command -v multipass > /dev/null || (echo "Please install multipass."; exit 1);
+command -v petname > /dev/null || (echo "Please install petname."; exit 1);
+if [ ! -f microstack_rocky_amd64.snap ]; then
+   echo "microstack_rocky_amd64.snap not found."
+   echo "Please run snapcraft before executing the tests."
+   exit 1
+fi
+
+MACHINE=$(petname)
+DISTRO=18.04
+
+# Launch a machine and copy the snap to it.
+multipass launch --cpus 2 --mem 16G $DISTRO --name $MACHINE
+multipass copy-files microstack_rocky_amd64.snap $MACHINE:
+multipass exec $MACHINE -- \
+          sudo snap install --classic --dangerous microstack*.snap
+
+# Run microstack.launch and wait for it to complete.
+multipass exec $MACHINE -- /snap/bin/microstack.launch breakfast
+IP=$(multipass exec $MACHINE -- /snap/bin/microstack.openstack server list | grep breakfast | cut -d" " -f9)
+echo "Waiting for ping..."
+PINGS=1
+MAX_PINGS=20
+until multipass exec $MACHINE -- ping -c 1 $IP &>/dev/null; do
+    PINGS=$(($PINGS + 1));
+    if test $PINGS -gt $MAX_PINGS; then
+        break
+    fi
+done;
+
+# Verify that we can ping the machine, and ping from the machine to
+# canonical.com (91.189.94.250).
+# TODO no longer hard code canonical.com's IP address.
+multipass exec $MACHINE -- ping -c 1 $IP;
+sleep 5; # Sometimes the machine is still not quite ready. TODO better wait.
+multipass exec $MACHINE -- \
+          ssh -oStrictHostKeyChecking=no -i .ssh/id_microstack cirros@$IP -- \
+          ping -c 1 91.189.94.250
+
+# Cleanup
+unset IP
+echo "Completed tests. Tearing down $MACHINE."
+multipass stop $MACHINE
+multipass purge  # This is a little bit rude to do, but we assume that
+                 # we can beat up on the test machine a bit.
+