integration_test.go

package webtest_test

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
	"net/http/httptest"
	"reflect"
	"testing"

	webtest "github.com/podhmo/go-webtest"
	"github.com/podhmo/go-webtest/jsonequal"
	"github.com/podhmo/go-webtest/snapshot"
	"github.com/podhmo/go-webtest/tripperware"
	"github.com/podhmo/go-webtest/try"
	"github.com/podhmo/noerror"
)

type Input struct {
	Values []int
}

func handleAdd(w http.ResponseWriter, req *http.Request) {
	var data Input
	decoder := json.NewDecoder(req.Body)
	if err := decoder.Decode(&data); err != nil {
		w.WriteHeader(400)
		fmt.Fprintf(w, `{"error": %q}`, err.Error())
		return
	}

	var n int
	for _, v := range data.Values {
		n += v
	}
	w.Header().Set("Content-Type", "application/json")
	encoder := json.NewEncoder(w)
	if err := encoder.Encode(map[string]int{"result": n}); err != nil {
		panic(err)
	}
}

func TestHandler(t *testing.T) {
	t.Run("plain", func(t *testing.T) {
		rec := httptest.NewRecorder()
		req := httptest.NewRequest("POST", "/", bytes.NewBufferString(`{"values": [1,2,3]}`))
		req.Header.Set("Content-Type", "application/json")

		handleAdd(rec, req)
		res := rec.Result()

		if res.StatusCode != 200 {
			b, _ := ioutil.ReadAll(res.Body)
			t.Fatalf("status code, want 200, but got %d\n response:%s", res.StatusCode, string(b))
		}

		var got interface{}
		decoder := json.NewDecoder(res.Body)
		if err := decoder.Decode(&got); err != nil {
			t.Fatal(err)
		}
		defer res.Body.Close()

		want := snapshot.Take(t, &got)
		if !reflect.DeepEqual(want, got) {
			t.Errorf(`want %s, but got %s`, want, got)
		}
	})

	t.Run("webtest", func(t *testing.T) {
		c := webtest.NewClientFromHandler(http.HandlerFunc(handleAdd))
		var want interface{}
		got, err := c.Post("/",
			webtest.WithJSONString(`{"values": [1,2,3]}`),
			webtest.WithTripperware(
				tripperware.ExpectCode(t, 200),
				tripperware.GetExpectedDataFromSnapshot(t, &want),
			),
		)

		noerror.Must(t, err)
		defer func() { noerror.Must(t, got.Close()) }()
		noerror.Should(t,
			jsonequal.ShouldBeSame(
				jsonequal.From(got.JSONData()),
				jsonequal.From(want),
			),
		)
	})

	t.Run("try", func(t *testing.T) {
		c := webtest.NewClientFromHandler(http.HandlerFunc(handleAdd))

		var want interface{}
		try.It{
			Code: 200,
			Want: &want,
			ModifyResponse: func(res webtest.Response) (got interface{}) {
				return res.JSONData()
			},
		}.With(t, c,
			"POST", "/",
			webtest.WithJSONString(`{"values": [1,2,3]}`),
		)
	})
}