add test helper for starting a new pilosa instance

Pilosa runs on ephemeral ports with temporrary storage.

test/pilosa.go

@@ -0,0 +1,48 @@
+package test
+
+import (
+	"bytes"
+	"io/ioutil"
+	"net"
+	"strconv"
+	"testing"
+
+	"github.com/pilosa/pilosa/server"
+)
+
+func MustNewRunningServer(t *testing.T) *server.Command {
+	s := server.NewCommand(&bytes.Buffer{}, ioutil.Discard, ioutil.Discard)
+	s.Config.Bind = ":0"
+	port := strconv.Itoa(MustOpenPort(t))
+	s.Config.GossipPort = port
+	s.Config.GossipSeed = "localhost:" + port
+	td, err := ioutil.TempDir("", "")
+	if err != nil {
+		t.Fatalf("error creating temp data directory: %v", err)
+	}
+	s.Config.DataDir = td
+	err = s.Run()
+	if err != nil {
+		t.Fatalf("error running new pilosa server: %v", err)
+	}
+	return s
+}
+
+func MustOpenPort(t *testing.T) int {
+	addr, err := net.ResolveTCPAddr("tcp", ":0")
+	if err != nil {
+		t.Fatalf("resolving new port addr: %v", err)
+	}
+
+	l, err := net.ListenTCP("tcp", addr)
+	if err != nil {
+		t.Fatalf("listening to get new port: %v", err)
+	}
+	defer func() {
+		err := l.Close()
+		if err != nil {
+			t.Logf("error closing listener in MustOpenPort: %v", err)
+		}
+	}()
+	return l.Addr().(*net.TCPAddr).Port
+}