Implementation of bp per-net-dhcp-enable

Change-Id: I81c2e6adb02921e8b80f8181a730b1cba9ffa649

quantum/tests/unit/test_linux_dhcp.py

@@ -58,6 +58,7 @@ class FakeV4Subnet:
     ip_version = 4
     cidr = '192.168.0.0/24'
     gateway_ip = '192.168.0.1'
+    enable_dhcp = True
 
 
 class FakeV6Subnet:
@@ -65,6 +66,15 @@ class FakeV6Subnet:
     ip_version = 6
     cidr = 'fdca:3ba5:a17a:4ba3::/64'
     gateway_ip = 'fdca:3ba5:a17a:4ba3::1'
+    enable_dhcp = True
+
+
+class FakeV4SubnetNoDHCP:
+    id = 'eeeeeeee-eeee-eeee-eeee-eeeeeeeeeeee'
+    ip_version = 4
+    cidr = '192.168.1.0/24'
+    gateway_ip = '192.168.1.1'
+    enable_dhcp = False
 
 
 class FakeV4Network:
@@ -85,6 +95,12 @@ class FakeDualNetwork:
     ports = [FakePort1(), FakePort2(), FakePort3()]
 
 
+class FakeDualNetworkSingleDHCP:
+    id = 'cccccccc-cccc-cccc-cccc-cccccccccccc'
+    subnets = [FakeV4Subnet(), FakeV4SubnetNoDHCP()]
+    ports = [FakePort1(), FakePort2(), FakePort3()]
+
+
 class TestDhcpBase(unittest.TestCase):
     def test_base_abc_error(self):
         self.assertRaises(TypeError, dhcp.DhcpBase, None)
@@ -353,6 +369,15 @@ class TestDnsmasq(TestBase):
 
         self.safe.assert_called_once_with('/foo/opts', expected)
 
+    def test_output_opts_file_single_dhcp(self):
+        expected = 'tag:tag0,option:router,192.168.0.1'
+        with mock.patch.object(dhcp.Dnsmasq, 'get_conf_file_name') as conf_fn:
+            conf_fn.return_value = '/foo/opts'
+            dm = dhcp.Dnsmasq(self.conf, FakeDualNetworkSingleDHCP())
+            dm._output_opts_file()
+
+        self.safe.assert_called_once_with('/foo/opts', expected)
+
     def test_reload_allocations(self):
         exp_host_name = '/dhcp/cccccccc-cccc-cccc-cccc-cccccccccccc/host'
         exp_host_data = """