diff --git a/test/integration/default/controls/config_spec.rb b/test/integration/default/controls/config_spec.rb
index 1f7f860..999865b 100644
--- a/test/integration/default/controls/config_spec.rb
+++ b/test/integration/default/controls/config_spec.rb
@@ -4,14 +4,41 @@
 case platform[:family]
 when 'debian'
   service_config_filename = '/etc/default/isc-dhcp-server'
+  service_config_file_contents = <<~SERVICE_CONFIG_FILE.chomp
+    # SaltStack-generated demon configuration file for ISC dhcpd
+
+    # Path to dhcpd's config file (default: /etc/dhcp/dhcpd.conf).
+    #DHCPD_CONF=/etc/dhcp/dhcpd.conf
+
+    # Path to dhcpd's PID file (default: /var/run/dhcpd.pid).
+    #DHCPD_PID=/var/run/dhcpd.pid
+
+    # Additional options to start dhcpd with.
+    #       Don't use options -cf or -pf here; use DHCPD_CONF/ DHCPD_PID instead
+    #OPTIONS=""
+
+    # On what interfaces should the DHCP server (dhcpd) serve DHCP requests?
+    #       Separate multiple interfaces with spaces, e.g. "eth0 eth1".
+    INTERFACES="em1 em2"
+  SERVICE_CONFIG_FILE
 when 'redhat', 'fedora'
   service_config_filename = '/etc/systemd/system/dhcpd.service.d/override.conf'
+  service_config_file_contents = <<~SERVICE_CONFIG_FILE.chomp
+    [Service]
+    ExecStart=
+    ExecStart=/usr/sbin/dhcpd -f -cf /etc/dhcp/dhcpd.conf -user dhcpd -group dhcpd --no-pid em1 em2
+  SERVICE_CONFIG_FILE
 when 'suse'
   config_filename = '/etc/dhcpd.conf'
 when 'freebsd'
   config_filename = '/usr/local/etc/dhcpd.conf'
   rootgroup = 'wheel'
   service_config_filename = '/etc/rc.conf.d/dhcpd'
+  service_config_file_contents = <<~SERVICE_CONFIG_FILE.chomp
+    # SaltStack-generated demon configuration file for ISC dhcpd
+
+    dhcpd_ifaces="em1 em2"
+  SERVICE_CONFIG_FILE
 when 'linux'
   case platform[:name]
   when 'arch'
@@ -27,6 +54,138 @@
     it { should be_owned_by 'root' }
     it { should be_grouped_into rootgroup }
     its('mode') { should cmp '0644' }
+    its('content') do
+      should include <<~CONFIG_FILE.chomp
+        # dhcpd.conf
+        #
+        # SaltStack-generated configuration file for ISC dhcpd
+        #
+
+        # Customized dhcp options
+        option auto-proxy-config code 252 = string;
+        # option definitions common to all supported networks...
+        option domain-name "example.org";
+        option domain-name-servers ns1.example.org, ns2.example.org;
+        default-lease-time 600;
+        max-lease-time 7200;
+
+        #use-host-decl-names off;
+
+        # Use this to enble / disable dynamic dns updates globally.
+        #ddns-update-style none;
+        #update-static-leases off;
+
+        # If this DHCP server is the official DHCP server for the local
+        # network, the authoritative directive should be uncommented.
+        #authoritative;
+
+        # Use this to send dhcp log messages to a different log file (you also
+        # have to hack syslog.conf to complete the redirection).
+        log-facility local7;
+        # You can declare a class of clients and then do address allocation
+        # based on that.  The example below shows a case where all clients
+        # in a certain class get addresses on the 10.17.224/24 subnet, and all
+        # other clients get addresses on the 10.0.29/24 subnet.
+        class "foo" {
+          match if substring (option vendor-class-identifier, 0, 4) = "SUNW";
+        }
+        failover peer "dhcp-failover" {
+          primary;
+          address 10.152.187.5;
+          port 647;
+          peer address 10.152.187.6;
+          peer port 647;
+          mclt 3600;
+          split 128;
+        }
+        # No service will be given on this subnet, but declaring it helps the
+        # DHCP server to understand the network topology.
+        subnet 10.152.187.0 netmask 255.255.255.0 {
+          pool {
+            failover peer "dhcp-failover";
+            range 10.152.187.1 10.152.187.254;
+          }
+        }
+        # This is a very basic subnet declaration.
+        subnet 10.254.239.0 netmask 255.255.255.224 {
+          range 10.254.239.10 10.254.239.20;
+          option routers rtr-239-0-1.example.org, rtr-239-0-2.example.org;
+        }
+        # This declaration allows BOOTP clients to get dynamic addresses,
+        # which we don't really recommend.
+        subnet 10.254.239.32 netmask 255.255.255.224 {
+          range dynamic-bootp 10.254.239.40 10.254.239.60;
+          option broadcast-address 10.254.239.31;
+          option routers rtr-239-32-1.example.org;
+        }
+        # A slightly different configuration for an internal subnet.
+        subnet 10.5.5.0 netmask 255.255.255.224 {
+          range 10.5.5.26 10.5.5.30;
+          option broadcast-address 10.5.5.31;
+          option domain-name-servers ns1.internal.example.org;
+          option domain-name "internal.example.org";
+          default-lease-time 600;
+          max-lease-time 7200;
+          option routers 10.5.5.1;
+
+          # Hosts can be specified for subnets, taking subnets defaults
+          host jake {
+            hardware ethernet 08:00:a7:26:c0:a9;
+            fixed-address 10.5.5.27;
+          }
+        }
+
+
+        # Hosts which require special configuration options can be listed in
+        # host statements.  If no address is specified, the address will be
+        # allocated dynamically (if possible), but the host-specific information
+        # will still come from the host declaration.
+        host passacaglia {
+          hardware ethernet 0:0:c0:5d:bd:95;
+          filename "vmunix.passacaglia";
+          server-name "toccata.fugue.com";
+        }
+
+        # Fixed IP addresses can also be specified for hosts.  These addresses
+        # should not also be listed as being available for dynamic assignment.
+        # Hosts for which fixed IP addresses have been specified can boot using
+        # BOOTP or DHCP.  Hosts for which no fixed address is specified can only
+        # be booted with DHCP, unless there is an address range on the subnet
+        # to which a BOOTP client is connected which has the dynamic-bootp flag
+        # set.
+        host fantasia {
+          hardware ethernet 08:00:07:26:c0:a5;
+          fixed-address fantasia.fugue.com;
+        }
+
+        # The hostname for a host can be passed in the DHCP response. Using the
+        # host_name key sets option host-name in the dhcpd configuration.
+        host joe {
+          hardware ethernet 08:00:2b:4c:29:32;
+          fixed-address joe.fugue.com;
+          option host-name "joe";
+        }
+
+        shared-network 224-29 {
+
+          subnet 10.17.224.0 netmask 255.255.255.0 {
+            option routers rtr-224.example.org;
+          }
+
+          subnet 10.0.29.0 netmask 255.255.255.0 {
+            option routers rtr-29.example.org;
+          }
+          pool {
+            allow members of "foo";
+            range 10.17.224.10 10.17.224.250;
+          }
+          pool {
+            deny members of "foo";
+            range 10.0.29.10 10.0.29.230;
+          }
+        }
+      CONFIG_FILE
+    end
   end
 end
 
@@ -45,5 +204,6 @@
     it { should be_owned_by 'root' }
     it { should be_grouped_into rootgroup }
     its('mode') { should cmp '0644' }
+    its('content') { should include service_config_file_contents }
   end
 end