Added graceful shutdown

Server_test.go

@@ -4,9 +4,11 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"net"
 	"net/http"
 	"net/http/httptest"
 	"strings"
+	"syscall"
 	"testing"
 
 	"git.akyoto.dev/go/assert"
@@ -121,7 +123,7 @@ func TestRouter(t *testing.T) {
 func TestPanic(t *testing.T) {
 	s := server.New()
 
-	s.Router().Add(http.MethodGet, "/panic", func(ctx server.Context) error {
+	s.Router.Add(http.MethodGet, "/panic", func(ctx server.Context) error {
 		panic("Something unbelievable happened")
 	})
 
@@ -139,3 +141,25 @@ func TestPanic(t *testing.T) {
 		s.ServeHTTP(response, request)
 	})
 }
+
+func TestRun(t *testing.T) {
+	s := server.New()
+
+	go func() {
+		_, err := http.Get("http://127.0.0.1:8080/")
+		assert.Nil(t, err)
+		err = syscall.Kill(syscall.Getpid(), syscall.SIGTERM)
+		assert.Nil(t, err)
+	}()
+
+	s.Run(":8080")
+}
+
+func TestUnavailablePort(t *testing.T) {
+	listener, err := net.Listen("tcp", ":8080")
+	assert.Nil(t, err)
+	defer listener.Close()
+
+	s := server.New()
+	s.Run(":8080")
+}