[TESTS] oauth2: add integration test helpers

(cherry picked from commit e11dcc60f2)

use backticks to avoid backslash

(cherry picked from commit 34212791ee)
(cherry picked from commit bde9473c69eaf6306457b4218d9704af64cb6cc8)
(cherry picked from commit d4deb43084eec4ce0de786a01acef52921a39b13)
(cherry picked from commit 08e91649b0057258ea5d775447d84093c31ad523)
(cherry picked from commit 2b988e5415b35e608726facb5d23a920334fda1c)

[TESTS] auth LinkAccount test coverage (squash)

(cherry picked from commit a2b2e3066bee46ca15ce66d0deb7ef3e89915248)
(cherry picked from commit 841d1b50731a94b9330b6a623a40f8aa0a6befa8)
(cherry picked from commit 35da630ad884a9ffff5bd873123687af169a6cac)
(cherry picked from commit caf2dc4fa7c6fb45a19edc5a025579d42d8db455)
(cherry picked from commit 6eb81e67ba69aeb9f1290f6717ec6c6a367752c3)
(cherry picked from commit d59757239f4fd6353dafd88f2460145b88ef38a1)
(cherry picked from commit 38a121b6880538f381799fb69666e13abf667502)
(cherry picked from commit 20613874ee04286a5ecb28045ec80af0fd850582)
(cherry picked from commit 6d2705e10858baf5e33df0ced047c544ed826fd3)
(cherry picked from commit f177b728142911fed6709339dd0e686017b610b0)
(cherry picked from commit 75e1fc4c8318b378f94065a268b079ac152657ef)
(cherry picked from commit ba64fa9867b06fb0b390a799ef4c3f39f554bb0b)
(cherry picked from commit 0b8ab0893ec6b6d689534b5e4ac50cdfe36c34e9)
(cherry picked from commit 1419d11435b0cdf7c41cb7175dffaf521ecfacd7)
(cherry picked from commit 38766847e0441f4b3841b05b34e3442f4e23af06)
(cherry picked from commit e75177b48202ad65115422aae3c79d008ab7a01d)
(cherry picked from commit 66ebb38ac5f10bebf4e68142d403272862003f56)
(cherry picked from commit fe6f8f9b6c113749771efd036f1ad7aef68bc720)
(cherry picked from commit 6c873fcb8a742a6bc72f884e76c8a8e16d15bfdd)
(cherry picked from commit e6c0202484)

models/auth/source.go

@@ -5,6 +5,7 @@
 package auth
 
 import (
+	"context"
 	"fmt"
 	"reflect"
 
@@ -306,6 +307,17 @@ func GetSourceByID(id int64) (*Source, error) {
 	return source, nil
 }
 
+func GetSourceByName(ctx context.Context, name string) (*Source, error) {
+	source := &Source{}
+	has, err := db.GetEngine(ctx).Where("name = ?", name).Get(source)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrSourceNotExist{}
+	}
+	return source, nil
+}
+
 // UpdateSource updates a Source record in DB.
 func UpdateSource(source *Source) error {
 	var originalSource *Source

tests/integration/integration_test.go

@@ -39,6 +39,7 @@ import (
 	"code.gitea.io/gitea/tests"
 
 	"github.com/PuerkitoBio/goquery"
+	goth_gitlab "github.com/markbates/goth/providers/gitlab"
 	"github.com/stretchr/testify/assert"
 	"github.com/xeipuuv/gojsonschema"
 )
@@ -231,6 +232,39 @@ func getUserToken(t testing.TB, userName string, scope ...auth.AccessTokenScope)
 	return getTokenForLoggedInUser(t, loginUser(t, userName), scope...)
 }
 
+func addAuthSource(t *testing.T, payload map[string]string) *auth.Source {
+	session := loginUser(t, "user1")
+	payload["_csrf"] = GetCSRF(t, session, "/admin/auths/new")
+	req := NewRequestWithValues(t, "POST", "/admin/auths/new", payload)
+	session.MakeRequest(t, req, http.StatusSeeOther)
+	source, err := auth.GetSourceByName(context.Background(), payload["name"])
+	assert.NoError(t, err)
+	return source
+}
+
+func authSourcePayloadOAuth2(name string) map[string]string {
+	return map[string]string{
+		"type":      fmt.Sprintf("%d", auth.OAuth2),
+		"name":      name,
+		"is_active": "on",
+	}
+}
+
+func authSourcePayloadGitLab(name string) map[string]string {
+	payload := authSourcePayloadOAuth2(name)
+	payload["oauth2_provider"] = "gitlab"
+	return payload
+}
+
+func authSourcePayloadGitLabCustom(name string) map[string]string {
+	payload := authSourcePayloadGitLab(name)
+	payload["oauth2_use_custom_url"] = "on"
+	payload["oauth2_auth_url"] = goth_gitlab.AuthURL
+	payload["oauth2_token_url"] = goth_gitlab.TokenURL
+	payload["oauth2_profile_url"] = goth_gitlab.ProfileURL
+	return payload
+}
+
 func createUser(ctx context.Context, t testing.TB, user *user_model.User) func() {
 	user.MustChangePassword = false
 	user.LowerName = strings.ToLower(user.Name)