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package main
import (
"bytes"
"errors"
"log"
"net/http"
"net/http/httptest"
"testing"
"github.com/stretchr/testify/assert"
)
func TestStartValues(t *testing.T) {
// pre-setup
oldHost, oldPort := *host, *port
defer func() {
*host = oldHost
*port = oldPort
}()
// setup
*host = "wow.com"
*port = "42"
// act
res := startValues()
// assert
assert.Equal(t, "listening in: wow.com:42", res)
}
func TestErrorHandler(t *testing.T) {
// pre-setup
stdOutput := log.Writer()
defer func() {
log.SetOutput(stdOutput)
}()
// setup
var buf bytes.Buffer
log.SetOutput(&buf) // to record what is logged
f := func(http.ResponseWriter, *http.Request) error {
return errors.New("scary error")
}
h := errorHandler(f)
res := httptest.NewRecorder()
req := httptest.NewRequest(http.MethodGet, "/", nil)
// act
h(res, req)
// assert
assert.Contains(t, buf.String(), `handling "/": scary error`)
}