disable gravatar in test (#32529)

When running e2e tests on flaky networks, gravatar can cause a timeout
and test failures. Turn off, and populate avatars on e2e test suite run
to make them reliable.

models/fixtures/system_setting.yml

@@ -1,7 +1,7 @@
 -
   id: 1
   setting_key: 'picture.disable_gravatar'
-  setting_value: 'false'
+  setting_value: 'true'
   version: 1
   created: 1653533198
   updated: 1653533198

modules/repository/commits_test.go

@@ -4,8 +4,6 @@
 package repository
 
 import (
-	"crypto/md5"
-	"fmt"
 	"strconv"
 	"testing"
 	"time"
@@ -125,15 +123,12 @@ func TestPushCommits_AvatarLink(t *testing.T) {
 		},
 	}
 
-	setting.GravatarSource = "https://secure.gravatar.com/avatar"
-	setting.OfflineMode = true
-
 	assert.Equal(t,
-		"/avatars/avatar2?size="+strconv.Itoa(28*setting.Avatar.RenderedSizeFactor),
+		"/avatars/ab53a2911ddf9b4817ac01ddcd3d975f?size="+strconv.Itoa(28*setting.Avatar.RenderedSizeFactor),
 		pushCommits.AvatarLink(db.DefaultContext, "user2@example.com"))
 
 	assert.Equal(t,
-		fmt.Sprintf("https://secure.gravatar.com/avatar/%x?d=identicon&s=%d", md5.Sum([]byte("nonexistent@example.com")), 28*setting.Avatar.RenderedSizeFactor),
+		"/assets/img/avatar_default.png",
 		pushCommits.AvatarLink(db.DefaultContext, "nonexistent@example.com"))
 }
 

services/repository/contributors_graph_test.go

@@ -18,6 +18,7 @@ import (
 
 func TestRepository_ContributorsGraph(t *testing.T) {
 	assert.NoError(t, unittest.PrepareTestDatabase())
+
 	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 2})
 	assert.NoError(t, repo.LoadOwner(db.DefaultContext))
 	mockCache, err := cache.NewStringCache(setting.Cache{})
@@ -46,7 +47,7 @@ func TestRepository_ContributorsGraph(t *testing.T) {
 
 	assert.EqualValues(t, &ContributorData{
 		Name:         "Ethan Koenig",
-		AvatarLink:   "https://secure.gravatar.com/avatar/b42fb195faa8c61b8d88abfefe30e9e3?d=identicon",
+		AvatarLink:   "/assets/img/avatar_default.png",
 		TotalCommits: 1,
 		Weeks: map[int64]*WeekData{
 			1511654400000: {

tests/e2e/e2e_test.go

@@ -107,7 +107,7 @@ func TestE2e(t *testing.T) {
 				cmd.Stdout = &stdout
 				cmd.Stderr = &stderr
 
-				err := cmd.Run()
+				err = cmd.Run()
 				if err != nil {
 					// Currently colored output is conflicting. Using Printf until that is resolved.
 					fmt.Printf("%v", stdout.String())