add test + set prepareStmt to true + setMaxConn to 1

db.go

@@ -32,6 +32,8 @@ func init() {
 			log.Printf("failed to connect database, got error %v\n", err)
 		}
 
+		sqlDB.SetMaxOpenConns(1)
+
 		RunMigrations()
 		if DB.Dialector.Name() == "sqlite" {
 			DB.Exec("PRAGMA foreign_keys = ON")
@@ -69,7 +71,9 @@ func OpenTestConnection() (db *gorm.DB, err error) {
 		db, err = gorm.Open(sqlserver.Open(dbDSN), &gorm.Config{})
 	default:
 		log.Println("testing sqlite3...")
-		db, err = gorm.Open(sqlite.Open(filepath.Join(os.TempDir(), "gorm.db")), &gorm.Config{})
+		db, err = gorm.Open(sqlite.Open(filepath.Join(os.TempDir(), "gorm.db")), &gorm.Config{
+			PrepareStmt: true, // set this to false and the test passes
+		})
 	}
 
 	if debug := os.Getenv("DEBUG"); debug == "true" {

go.mod

@@ -30,12 +30,9 @@ require (
 	golang.org/x/crypto v0.29.0 // indirect
 	golang.org/x/mod v0.22.0 // indirect
 	golang.org/x/sync v0.9.0 // indirect
-	golang.org/x/sys v0.27.0 // indirect
 	golang.org/x/text v0.20.0 // indirect
 	golang.org/x/tools v0.27.0 // indirect
 	gorm.io/datatypes v1.2.4 // indirect
 	gorm.io/hints v1.1.2 // indirect
 	gorm.io/plugin/dbresolver v1.5.3 // indirect
 )
-
-replace gorm.io/gorm => ./gorm

main_test.go

@@ -1,9 +1,14 @@
 package main
 
 import (
+	"context"
+	"sync"
 	"testing"
+	"time"
 )
 
+const concurrentReads = 40
+
 // GORM_REPO: https://github.com/go-gorm/gorm.git
 // GORM_BRANCH: master
 // TEST_DRIVERS: sqlite, mysql, postgres, sqlserver
@@ -13,8 +18,60 @@ func TestGORM(t *testing.T) {
 
 	DB.Create(&user)
 
-	var result User
-	if err := DB.First(&result, user.ID).Error; err != nil {
-		t.Errorf("Failed, got error: %v", err)
+	testRunSuccessful := false
+	wgSuccess := sync.WaitGroup{}
+	wgSuccess.Add(concurrentReads)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+
+	start := make(chan struct{})
+
+	for i := 0; i < concurrentReads/2; i++ {
+		go func() {
+			t.Logf("Entered routine 1-%d", i)
+			var result User
+
+			<-start
+			transaction := DB.Begin()
+			if err := transaction.First(&result, "id = ? ", 1).Error; err != nil {
+				transaction.Rollback()
+				return
+			}
+			transaction.Commit()
+			t.Log("Got User from routine 1")
+			wgSuccess.Done()
+		}()
 	}
+
+	for i := 0; i < concurrentReads/2; i++ {
+		go func() {
+			t.Logf("Entered routine 2-%d", i)
+			var result User
+
+			<-start
+			if err := DB.First(&result, "id = ? ", 1).Error; err != nil {
+				t.Errorf("Failed, got error: %v", err)
+				return
+			}
+			t.Log("Got User from routine 2")
+			wgSuccess.Done()
+		}()
+	}
+
+	time.Sleep(200 * time.Millisecond)
+	close(start)
+	t.Log("Started routines")
+
+	go func() {
+		wgSuccess.Wait()
+		testRunSuccessful = true
+	}()
+
+	<-ctx.Done()
+	if !testRunSuccessful {
+		t.Fatalf("Test failed")
+	}
+
+	t.Logf("Test completed")
 }