Add unit tests for state functions

Currently unit tests only succeed if the state path
is writeable, since it is hardcoded.

cluster/state_test.go

@@ -0,0 +1,32 @@
+package cluster
+
+import (
+	"net"
+	"reflect"
+	"testing"
+
+	"github.com/costela/wesher/common"
+)
+
+func Test_State_Save_Load(t *testing.T) {
+	key := "abcdefghijklmnopqrstuvwxyzABCDEF"
+	node := common.Node{
+		Name: "node",
+		Addr: net.ParseIP("10.0.0.2"),
+	}
+
+	cluster := Cluster{
+		state: &State{
+			ClusterKey: []byte(key),
+			Nodes:      []common.Node{node},
+		},
+	}
+
+	cluster.saveState()
+	loaded := &State{}
+	loadState(loaded)
+
+	if !reflect.DeepEqual(cluster.state, loaded) {
+		t.Errorf("cluster state save then reload mistmatch: %s / %s", cluster.state, loaded)
+	}
+}