use TestMain and remove external binary

gracehttp/http_test.go

@@ -17,16 +17,10 @@ import (
 	"time"
 
 	"github.com/facebookgo/freeport"
-	"github.com/facebookgo/tool"
 )
 
-var (
 // Debug logging.
-	debugLog          = flag.Bool("debug", false, "enable debug logging")
-	testserverCommand = &tool.CommandBuild{
-		ImportPath: "github.com/facebookgo/grace/gracehttp/testserver",
-	}
-)
+var debugLog = flag.Bool("debug", false, "enable debug logging")
 
 func debug(format string, a ...interface{}) {
 	if *debugLog {
@@ -34,19 +28,6 @@ func debug(format string, a ...interface{}) {
 	}
 }
 
-var (
-	buildOut  string
-	buildErr  error
-	buildOnce sync.Once
-)
-
-// The response from the test server.
-type response struct {
-	Sleep time.Duration
-	Pid   int
-	Error string
-}
-
 // State for the test run.
 type harness struct {
 	T                 *testing.T     // The test instance.
@@ -78,13 +59,8 @@ func (h *harness) setupAddr() {
 
 // Start a fresh server and wait for pid updates on restart.
 func (h *harness) Start() {
-	bin, err := testserverCommand.Build()
-	if err != nil {
-		h.T.Fatalf("build error: %s", err)
-	}
-
 	h.setupAddr()
-	cmd := exec.Command(bin, "-http", h.httpAddr, "-https", h.httpsAddr)
+	cmd := exec.Command(os.Args[0], "-http", h.httpAddr, "-https", h.httpsAddr)
 	stderr, err := cmd.StderrPipe()
 	if err != nil {
 		h.T.Fatal(err)

gracehttp/testbin_test.go

@@ -1,5 +1,4 @@
-// Command testserver implements a test case.
-package main
+package gracehttp_test
 
 import (
 	"crypto/tls"
@@ -11,11 +10,27 @@ import (
 	"os"
 	"strings"
 	"sync"
+	"testing"
 	"time"
 
 	"github.com/facebookgo/grace/gracehttp"
 )
 
+func TestMain(m *testing.M) {
+	const (
+		testbinKey   = "GRACEHTTP_TEST_BIN"
+		testbinValue = "1"
+	)
+	if os.Getenv(testbinKey) == testbinValue {
+		testbinMain()
+		return
+	}
+	if err := os.Setenv(testbinKey, testbinValue); err != nil {
+		panic(err)
+	}
+	os.Exit(m.Run())
+}
+
 type response struct {
 	Sleep time.Duration
 	Pid   int
@@ -84,7 +99,7 @@ func httpsServer(addr string) *http.Server {
 	}
 }
 
-func main() {
+func testbinMain() {
 	var httpAddr, httpsAddr string
 	flag.StringVar(&httpAddr, "http", ":48560", "http address to bind to")
 	flag.StringVar(&httpsAddr, "https", ":48561", "https address to bind to")
@@ -112,7 +127,7 @@ func main() {
 		go wait(&wg, fmt.Sprintf("https://%s/sleep/?duration=1ms", httpsAddr))
 		wg.Wait()
 
-		err = json.NewEncoder(os.Stderr).Encode(&response{Pid: os.Getpid()})
+		err := json.NewEncoder(os.Stderr).Encode(&response{Pid: os.Getpid()})
 		if err != nil {
 			log.Fatalf("Error writing startup json: %s", err)
 		}