add test for pihole scripts, restartDNS first test

test/test_pihole_scripts.py

@@ -0,0 +1,17 @@
+import pytest
+
+RESTART_DNS_STDOUT = { 
+    'alpine': '',
+    'debian': 'Restarting DNS forwarder and DHCP server: dnsmasq.\n'
+}
+def test_pihole_restartdns(RunningPiHole, Slow, persist_tag):
+    ''' ensure a new pid for dnsmasq appears and we have stdout as expected '''
+    oldpid = RunningPiHole.run('pidof dnsmasq')
+    restartdns = RunningPiHole.run('pihole restartdns')
+    Slow(lambda: RunningPiHole.run('pgrep dnsmasq').rc == 0)
+    newpid = RunningPiHole.run('pidof dnsmasq')
+    for pid in [oldpid, newpid]:
+        assert pid != ''
+    assert oldpid != newpid
+    assert restartdns.rc == 0
+    assert restartdns.stdout == RESTART_DNS_STDOUT[persist_tag]