Reduce LOC in kubelet tests

pkg/kubelet/dockertools/docker_test.go

@@ -680,37 +680,29 @@ func TestFindContainersByPod(t *testing.T) {
 }
 
 func TestMakePortsAndBindings(t *testing.T) {
+	portMapping := func(container, host int, protocol api.Protocol, ip string) kubecontainer.PortMapping {
+		return kubecontainer.PortMapping{
+			ContainerPort: container,
+			HostPort:      host,
+			Protocol:      protocol,
+			HostIP:        ip,
+		}
+	}
+
+	portBinding := func(port, ip string) dockernat.PortBinding {
+		return dockernat.PortBinding{
+			HostPort: port,
+			HostIP:   ip,
+		}
+	}
+
 	ports := []kubecontainer.PortMapping{
-		{
-			ContainerPort: 80,
-			HostPort:      8080,
-			HostIP:        "127.0.0.1",
-		},
-		{
-			ContainerPort: 443,
-			HostPort:      443,
-			Protocol:      "tcp",
-		},
-		{
-			ContainerPort: 444,
-			HostPort:      444,
-			Protocol:      "udp",
-		},
-		{
-			ContainerPort: 445,
-			HostPort:      445,
-			Protocol:      "foobar",
-		},
-		{
-			ContainerPort: 443,
-			HostPort:      446,
-			Protocol:      "tcp",
-		},
-		{
-			ContainerPort: 443,
-			HostPort:      446,
-			Protocol:      "udp",
-		},
+		portMapping(80, 8080, "", "127.0.0.1"),
+		portMapping(443, 443, "tcp", ""),
+		portMapping(444, 444, "udp", ""),
+		portMapping(445, 445, "foobar", ""),
+		portMapping(443, 446, "tcp", ""),
+		portMapping(443, 446, "udp", ""),
 	}
 
 	exposedPorts, bindings := makePortsAndBindings(ports)
@@ -731,38 +723,20 @@ func TestMakePortsAndBindings(t *testing.T) {
 	// Construct expected bindings
 	expectPortBindings := map[string][]dockernat.PortBinding{
 		"80/tcp": {
-			dockernat.PortBinding{
-				HostPort: "8080",
-				HostIP:   "127.0.0.1",
-			},
+			portBinding("8080", "127.0.0.1"),
 		},
 		"443/tcp": {
-			dockernat.PortBinding{
-				HostPort: "443",
-				HostIP:   "",
-			},
-			dockernat.PortBinding{
-				HostPort: "446",
-				HostIP:   "",
-			},
+			portBinding("443", ""),
+			portBinding("446", ""),
 		},
 		"443/udp": {
-			dockernat.PortBinding{
-				HostPort: "446",
-				HostIP:   "",
-			},
+			portBinding("446", ""),
 		},
 		"444/udp": {
-			dockernat.PortBinding{
-				HostPort: "444",
-				HostIP:   "",
-			},
+			portBinding("444", ""),
 		},
 		"445/tcp": {
-			dockernat.PortBinding{
-				HostPort: "445",
-				HostIP:   "",
-			},
+			portBinding("445", ""),
 		},
 	}