test: dynamic vault addr for watch test

Signed-off-by: Ville Vesilehto <[email protected]>

Author: thevilledev

watch/watch_test.go

@@ -8,6 +8,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"log"
+	"net"
 	"net/http"
 	"os"
 	"os/exec"
@@ -21,14 +23,14 @@ import (
 )
 
 const (
-	vaultAddr  = "http://127.0.0.1:8200"
 	vaultToken = "a_token"
 )
 
 var (
 	testVault   *vaultServer
 	testClients *dep.ClientSet
 	tokenRoleId string
+	vaultAddr   string
 )
 
 func TestMain(m *testing.M) {
@@ -37,7 +39,15 @@ func TestMain(m *testing.M) {
 
 // sub-main so I can use defer
 func main(m *testing.M) int {
-	//log.SetOutput(io.Discard)
+	log.SetOutput(io.Discard)
+	// Find a free port for the Vault server
+	listener, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		panic(fmt.Sprintf("failed to find free port for vault: %v", err))
+	}
+	vaultAddr = fmt.Sprintf("http://%s", listener.Addr().String())
+	listener.Close()
+
 	testVault = newTestVault()
 	defer func() { testVault.Stop() }()
 
@@ -94,6 +104,7 @@ func newTestVault() *vaultServer {
 	args := []string{
 		"server", "-dev", "-dev-root-token-id", vaultToken,
 		"-dev-no-store-token",
+		"-dev-listen-address", strings.TrimPrefix(vaultAddr, "http://"),
 	}
 	cmd := exec.Command("vault", args...)
 	var stdout, stderr bytes.Buffer