[sonic-cfggen] Add unit test for DHCP relay Jinja2 templates (#1357)

src/sonic-config-engine/tests/sample_output/docker-dhcp-relay.supervisord.conf

@@ -0,0 +1,33 @@
+[supervisord]
+logfile_maxbytes=1MB
+logfile_backups=2
+nodaemon=true
+
+[program:start.sh]
+command=/usr/bin/start.sh
+priority=1
+autostart=true
+autorestart=false
+stdout_logfile=syslog
+stderr_logfile=syslog
+
+[program:rsyslogd]
+command=/usr/sbin/rsyslogd -n
+priority=2
+autostart=false
+autorestart=false
+stdout_logfile=syslog
+stderr_logfile=syslog
+
+[group:isc-dhcp-relay]
+programs=isc-dhcp-relay-Vlan1000
+
+[program:isc-dhcp-relay-Vlan1000]
+command=/usr/sbin/dhcrelay -d -m discard -a %%h:%%p %%P --name-alias-map-file /tmp/port-name-alias-map.txt -i Vlan1000 -i PortChannel02 -i PortChannel03 -i PortChannel04 -i PortChannel01 192.0.0.1 192.0.0.2
+priority=3
+autostart=false
+autorestart=false
+stdout_logfile=syslog
+stderr_logfile=syslog
+
+

src/sonic-config-engine/tests/sample_output/wait_for_intf.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+
+function wait_until_iface_ready
+{
+    IFACE=$1
+
+    echo "Waiting until interface $IFACE is up..."
+
+    # Wait for the interface to come up (i.e., 'ip link show' returns 0)
+    until ip link show dev $IFACE up > /dev/null 2>&1; do
+        sleep 1
+    done
+
+    echo "Interface $IFACE is up"
+
+    echo "Waiting until interface $IFACE has an IPv4 address..."
+
+    # Wait until the interface gets assigned an IPv4 address
+    while true; do
+        IP=$(ip -4 addr show dev $IFACE | grep "inet " | awk '{ print $2 }' | cut -d '/' -f1)
+
+        if [ -n "$IP" ]; then
+            break
+        fi
+
+        sleep 1
+    done
+
+    echo "Interface $IFACE is configured with IP $IP"
+}
+
+
+# Wait for all interfaces to come up and have IPv4 addresses assigned
+wait_until_iface_ready Vlan1000
+wait_until_iface_ready PortChannel04
+wait_until_iface_ready PortChannel02
+wait_until_iface_ready PortChannel03
+wait_until_iface_ready PortChannel03
+wait_until_iface_ready PortChannel01
+wait_until_iface_ready PortChannel02
+wait_until_iface_ready PortChannel04
+wait_until_iface_ready PortChannel01
+

src/sonic-config-engine/tests/test_j2files.py

@@ -40,6 +40,19 @@ def test_ports_json(self):
         self.run_script(argument)
         self.assertTrue(filecmp.cmp(os.path.join(self.test_dir, 'sample_output', 'ports.json'), self.output_file))
 
+    def test_dhcp_relay(self):
+        # Test generation of wait_for_intf.sh
+        template_path = os.path.join(self.test_dir, '..', '..', '..', 'dockers', 'docker-dhcp-relay', 'wait_for_intf.sh.j2')
+        argument = '-m ' + self.t0_minigraph + ' -p ' + self.t0_port_config + ' -t ' + template_path + ' > ' + self.output_file
+        self.run_script(argument)
+        self.assertTrue(filecmp.cmp(os.path.join(self.test_dir, 'sample_output', 'wait_for_intf.sh'), self.output_file))
+
+        # Test generation of docker-dhcp-relay.supervisord.conf
+        template_path = os.path.join(self.test_dir, '..', '..', '..', 'dockers', 'docker-dhcp-relay', 'docker-dhcp-relay.supervisord.conf.j2')
+        argument = '-m ' + self.t0_minigraph + ' -p ' + self.t0_port_config + ' -t ' + template_path + ' > ' + self.output_file
+        self.run_script(argument)
+        self.assertTrue(filecmp.cmp(os.path.join(self.test_dir, 'sample_output', 'docker-dhcp-relay.supervisord.conf'), self.output_file))
+
     def test_lldp(self):
         lldpd_conf_template = os.path.join(self.test_dir, '..', '..', '..', 'dockers', 'docker-lldp-sv2', 'lldpd.conf.j2')
         argument = '-m ' + self.t0_minigraph + ' -p ' + self.t0_port_config + ' -t ' + lldpd_conf_template + ' > ' + self.output_file