package echo import ( "net/http" "net/http/httptest" "testing" "github.com/stretchr/testify/assert" ) func TestResponse(t *testing.T) { e := New() req := httptest.NewRequest(http.MethodGet, "/", nil) rec := httptest.NewRecorder() c := e.NewContext(req, rec) res := &Response{echo: e, Writer: rec} // Before res.Before(func() { c.Response().Header().Set(HeaderServer, "echo") }) res.Write([]byte("test")) assert.Equal(t, "echo", rec.Header().Get(HeaderServer)) }