3 files changed, 79 insertions, 11 deletions
diff --git a/services/doctor/dbconsistency.go b/services/doctor/dbconsistency.go
index e2dcb63f33..dfdf7b547a 100644
--- a/services/doctor/dbconsistency.go
+++ b/services/doctor/dbconsistency.go
@@ -61,26 +61,20 @@ func asFixer(fn func(ctx context.Context) error) func(ctx context.Context) (int6
 	}
 }
 
-func genericOrphanCheck(name, subject, refobject, joincond string) consistencyCheck {
+func genericOrphanCheck(name, subject, refObject, joinCond string) consistencyCheck {
 	return consistencyCheck{
 		Name: name,
 		Counter: func(ctx context.Context) (int64, error) {
-			return db.CountOrphanedObjects(ctx, subject, refobject, joincond)
+			return db.CountOrphanedObjects(ctx, subject, refObject, joinCond)
 		},
 		Fixer: func(ctx context.Context) (int64, error) {
-			err := db.DeleteOrphanedObjects(ctx, subject, refobject, joincond)
+			err := db.DeleteOrphanedObjects(ctx, subject, refObject, joinCond)
 			return -1, err
 		},
 	}
 }
 
-func checkDBConsistency(ctx context.Context, logger log.Logger, autofix bool) error {
-	// make sure DB version is uptodate
-	if err := db.InitEngineWithMigration(ctx, migrations.EnsureUpToDate); err != nil {
-		logger.Critical("Model version on the database does not match the current Gitea version. Model consistency will not be checked until the database is upgraded")
-		return err
-	}
-
+func prepareDBConsistencyChecks() []consistencyCheck {
 	consistencyChecks := []consistencyCheck{
 		{
 			// find labels without existing repo or org
@@ -210,7 +204,7 @@ func checkDBConsistency(ctx context.Context, logger log.Logger, autofix bool) er
 			"oauth2_grant", "user", "oauth2_grant.user_id=`user`.id"),
 		// find OAuth2Application without existing user
 		genericOrphanCheck("Orphaned OAuth2Application without existing User",
-			"oauth2_application", "user", "oauth2_application.uid=`user`.id"),
+			"oauth2_application", "user", "oauth2_application.uid=0 OR oauth2_application.uid=`user`.id"),
 		// find OAuth2AuthorizationCode without existing OAuth2Grant
 		genericOrphanCheck("Orphaned OAuth2AuthorizationCode without existing OAuth2Grant",
 			"oauth2_authorization_code", "oauth2_grant", "oauth2_authorization_code.grant_id=oauth2_grant.id"),
@@ -224,7 +218,16 @@ func checkDBConsistency(ctx context.Context, logger log.Logger, autofix bool) er
 		genericOrphanCheck("Orphaned Redirects without existing redirect user",
 			"user_redirect", "user", "user_redirect.redirect_user_id=`user`.id"),
 	)
+	return consistencyChecks
+}
 
+func checkDBConsistency(ctx context.Context, logger log.Logger, autofix bool) error {
+	// make sure DB version is uptodate
+	if err := db.InitEngineWithMigration(ctx, migrations.EnsureUpToDate); err != nil {
+		logger.Critical("Model version on the database does not match the current Gitea version. Model consistency will not be checked until the database is upgraded")
+		return err
+	}
+	consistencyChecks := prepareDBConsistencyChecks()
 	for _, c := range consistencyChecks {
 		if err := c.Run(ctx, logger, autofix); err != nil {
 			return err
diff --git a/services/doctor/dbconsistency_test.go b/services/doctor/dbconsistency_test.go
new file mode 100644
index 0000000000..4e4ac535b7
--- /dev/null
+++ b/services/doctor/dbconsistency_test.go
@@ -0,0 +1,51 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package doctor
+
+import (
+	"slices"
+	"testing"
+
+	"code.gitea.io/gitea/models/auth"
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/log"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestConsistencyCheck(t *testing.T) {
+	checks := prepareDBConsistencyChecks()
+	idx := slices.IndexFunc(checks, func(check consistencyCheck) bool {
+		return check.Name == "Orphaned OAuth2Application without existing User"
+	})
+	if !assert.NotEqual(t, -1, idx) {
+		return
+	}
+
+	_ = db.TruncateBeans(db.DefaultContext, &auth.OAuth2Application{}, &user.User{})
+	_ = db.TruncateBeans(db.DefaultContext, &auth.OAuth2Application{}, &auth.OAuth2Application{})
+
+	err := db.Insert(db.DefaultContext, &user.User{ID: 1})
+	assert.NoError(t, err)
+	err = db.Insert(db.DefaultContext, &auth.OAuth2Application{Name: "test-oauth2-app-1", ClientID: "client-id-1"})
+	assert.NoError(t, err)
+	err = db.Insert(db.DefaultContext, &auth.OAuth2Application{Name: "test-oauth2-app-2", ClientID: "client-id-2", UID: 1})
+	assert.NoError(t, err)
+	err = db.Insert(db.DefaultContext, &auth.OAuth2Application{Name: "test-oauth2-app-3", ClientID: "client-id-3", UID: 99999999})
+	assert.NoError(t, err)
+
+	unittest.AssertExistsAndLoadBean(t, &auth.OAuth2Application{ClientID: "client-id-1"})
+	unittest.AssertExistsAndLoadBean(t, &auth.OAuth2Application{ClientID: "client-id-2"})
+	unittest.AssertExistsAndLoadBean(t, &auth.OAuth2Application{ClientID: "client-id-3"})
+
+	oauth2AppCheck := checks[idx]
+	err = oauth2AppCheck.Run(db.DefaultContext, log.GetManager().GetLogger(log.DEFAULT), true)
+	assert.NoError(t, err)
+
+	unittest.AssertExistsAndLoadBean(t, &auth.OAuth2Application{ClientID: "client-id-1"})
+	unittest.AssertExistsAndLoadBean(t, &auth.OAuth2Application{ClientID: "client-id-2"})
+	unittest.AssertNotExistsBean(t, &auth.OAuth2Application{ClientID: "client-id-3"})
+}
diff --git a/services/doctor/main_test.go b/services/doctor/main_test.go
new file mode 100644
index 0000000000..0f365e21d0
--- /dev/null
+++ b/services/doctor/main_test.go
@@ -0,0 +1,14 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package doctor
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/unittest"
+)
+
+func TestMain(m *testing.M) {
+	unittest.MainTest(m)
+}