First commit

middleware/proxy/policy_test.go

@@ -0,0 +1,87 @@
+package proxy
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"testing"
+)
+
+var workableServer *httptest.Server
+
+func TestMain(m *testing.M) {
+	workableServer = httptest.NewServer(http.HandlerFunc(
+		func(w http.ResponseWriter, r *http.Request) {
+			// do nothing
+		}))
+	r := m.Run()
+	workableServer.Close()
+	os.Exit(r)
+}
+
+type customPolicy struct{}
+
+func (r *customPolicy) Select(pool HostPool) *UpstreamHost {
+	return pool[0]
+}
+
+func testPool() HostPool {
+	pool := []*UpstreamHost{
+		{
+			Name: workableServer.URL, // this should resolve (healthcheck test)
+		},
+		{
+			Name: "http://shouldnot.resolve", // this shouldn't
+		},
+		{
+			Name: "http://C",
+		},
+	}
+	return HostPool(pool)
+}
+
+func TestRoundRobinPolicy(t *testing.T) {
+	pool := testPool()
+	rrPolicy := &RoundRobin{}
+	h := rrPolicy.Select(pool)
+	// First selected host is 1, because counter starts at 0
+	// and increments before host is selected
+	if h != pool[1] {
+		t.Error("Expected first round robin host to be second host in the pool.")
+	}
+	h = rrPolicy.Select(pool)
+	if h != pool[2] {
+		t.Error("Expected second round robin host to be third host in the pool.")
+	}
+	// mark host as down
+	pool[0].Unhealthy = true
+	h = rrPolicy.Select(pool)
+	if h != pool[1] {
+		t.Error("Expected third round robin host to be first host in the pool.")
+	}
+}
+
+func TestLeastConnPolicy(t *testing.T) {
+	pool := testPool()
+	lcPolicy := &LeastConn{}
+	pool[0].Conns = 10
+	pool[1].Conns = 10
+	h := lcPolicy.Select(pool)
+	if h != pool[2] {
+		t.Error("Expected least connection host to be third host.")
+	}
+	pool[2].Conns = 100
+	h = lcPolicy.Select(pool)
+	if h != pool[0] && h != pool[1] {
+		t.Error("Expected least connection host to be first or second host.")
+	}
+}
+
+func TestCustomPolicy(t *testing.T) {
+	pool := testPool()
+	customPolicy := &customPolicy{}
+	h := customPolicy.Select(pool)
+	if h != pool[0] {
+		t.Error("Expected custom policy host to be the first host.")
+	}
+}