public-ip-tracker/tracker/ip/ip_test.go

package ip

import (
	"context"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"
)

func TestGetIPOK(t *testing.T) {
	t.Parallel()

	mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
		w.Write([]byte("198.51.100.42"))
	}))
	defer mockSrv.Close()

	clt := concreteIPGetter{
		httpClt:       mockSrv.Client(),
		remoteAddress: mockSrv.URL,
		timeout:       1 * time.Second,
	}
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	val, err := clt.GetCurrentPublicIP(ctx)
	if err != nil {
		t.Fatalf("Unexpected error %s", err.Error())
	}
	if val.String() != "198.51.100.42" {
		t.Fatalf("Unexpected public IP %v", val)
	}
}

func TestGetIPServerErr(t *testing.T) {
	t.Parallel()

	mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusInternalServerError)
	}))
	defer mockSrv.Close()

	clt := concreteIPGetter{
		httpClt:       mockSrv.Client(),
		remoteAddress: mockSrv.URL,
		timeout:       1 * time.Second,
	}
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	_, err := clt.GetCurrentPublicIP(ctx)
	if err == nil {
		t.Fatal("Unexpected nil error")
	} else if err.Error() != "invalid returncode 500" {
		t.Fatalf("Unexpected error %s", err.Error())
	}
}

func TestGetIPUnreachable(t *testing.T) {
	t.Parallel()

	mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	}))
	mockSrv.Close()

	clt := concreteIPGetter{
		httpClt:       mockSrv.Client(),
		remoteAddress: mockSrv.URL,
		timeout:       1 * time.Second,
	}
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	_, err := clt.GetCurrentPublicIP(ctx)
	if err == nil {
		t.Fatal("Unexpected nil error")
	} else if !strings.Contains(err.Error(), "connect: connection refused") {
		t.Fatalf("Unexpected error %s", err.Error())
	}
}

func TestGetIPInvalidResponse(t *testing.T) {
	t.Parallel()

	mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
		w.Write([]byte("toto"))
	}))
	defer mockSrv.Close()

	clt := concreteIPGetter{
		httpClt:       mockSrv.Client(),
		remoteAddress: mockSrv.URL,
		timeout:       1 * time.Second,
	}
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	_, err := clt.GetCurrentPublicIP(ctx)
	if err == nil {
		t.Fatal("Unexpected nil error")
	} else if err.Error() != `got an invalid public IP "toto"` {
		t.Fatalf("Unexpected error %s", err.Error())
	}
}

func TestGetIPTimeout(t *testing.T) {
	t.Parallel()

	mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		time.Sleep(100 * time.Millisecond)
		w.WriteHeader(http.StatusOK)
		w.Write([]byte("toto"))
	}))
	defer mockSrv.Close()

	clt := concreteIPGetter{
		httpClt:       mockSrv.Client(),
		remoteAddress: mockSrv.URL,
		timeout:       1 * time.Millisecond,
	}
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	_, err := clt.GetCurrentPublicIP(ctx)
	if err == nil {
		t.Fatal("Unexpected nil error")
	} else if !strings.Contains(err.Error(), "context deadline exceeded") {
		t.Fatalf("Unexpected error %s", err.Error())
	}
}