First commit in strategy rework

selector/strategy_test.go

@@ -0,0 +1,59 @@
+package selector
+
+import (
+	"testing"
+
+	"github.com/micro/go-micro/registry"
+)
+
+func TestStrategies(t *testing.T) {
+	testData := []*registry.Service{
+		&registry.Service{
+			Name:    "test1",
+			Version: "latest",
+			Nodes: []*registry.Node{
+				&registry.Node{
+					Id:      "test1-1",
+					Address: "10.0.0.1",
+					Port:    1001,
+				},
+				&registry.Node{
+					Id:      "test1-2",
+					Address: "10.0.0.2",
+					Port:    1002,
+				},
+			},
+		},
+		&registry.Service{
+			Name:    "test1",
+			Version: "default",
+			Nodes: []*registry.Node{
+				&registry.Node{
+					Id:      "test1-3",
+					Address: "10.0.0.3",
+					Port:    1003,
+				},
+				&registry.Node{
+					Id:      "test1-4",
+					Address: "10.0.0.4",
+					Port:    1004,
+				},
+			},
+		},
+	}
+
+	for name, strategy := range map[string]Strategy{"random": Random, "roundrobin": RoundRobin} {
+		next := strategy(testData)
+		counts := make(map[string]int)
+
+		for i := 0; i < 100; i++ {
+			node, err := next()
+			if err != nil {
+				t.Fatal(err)
+			}
+			counts[node.Id]++
+		}
+
+		t.Logf("%s: %+v\n", name, counts)
+	}
+}