test: coverage for foreign key violation err

tests/error_translator_test.go

@@ -58,3 +58,48 @@ func TestSupportedDialectorWithErrDuplicatedKey(t *testing.T) {
 		t.Fatalf("expected err: %v got err: %v", gorm.ErrDuplicatedKey, err)
 	}
 }
+
+func TestSupportedDialectorWithErrForeignKeyViolated(t *testing.T) {
+	type Country struct {
+		gorm.Model
+		Name string `gorm:"unique"`
+	}
+
+	type City struct {
+		gorm.Model
+		Name      string `gorm:"unique"`
+		CountryID uint
+		Country   Country `gorm:"Constraint:OnUpdate:CASCADE,OnDelete:CASCADE;FOREIGNKEY:CountryID;References:ID"`
+	}
+
+	db, err := OpenTestConnection(&gorm.Config{TranslateError: true})
+	if err != nil {
+		t.Fatalf("failed to connect database, got error %v", err)
+	}
+
+	dialectors := map[string]bool{"sqlite": true, "postgres": true, "mysql": false, "sqlserver": false}
+	if supported, found := dialectors[db.Dialector.Name()]; !(found && supported) {
+		return
+	}
+
+	if err = db.AutoMigrate(&Country{}, &City{}); err != nil {
+		t.Fatalf("failed to migrate countries & cities tables, got error: %v", err)
+	}
+
+	country := &Country{Name: "Netherlands"}
+
+	err = db.Create(country).Error
+	if err != nil {
+		t.Fatalf("failed to create country: %v", err)
+	}
+
+	err = db.Create(&City{Name: "Amsterdam", CountryID: country.ID}).Error
+	if err != nil {
+		t.Fatalf("failed to create city: %v", err)
+	}
+
+	err = db.Create(&City{Name: "Rotterdam", CountryID: 123}).Error
+	if !errors.Is(err, gorm.ErrForeignKeyViolated) {
+		t.Fatalf("expected err: %v got err: %v", gorm.ErrForeignKeyViolated, err)
+	}
+}

tests/go.mod

@@ -6,13 +6,13 @@ require (
 	github.com/google/uuid v1.3.0
 	github.com/jackc/pgx/v5 v5.3.1 // indirect
 	github.com/jinzhu/now v1.1.5
-	github.com/lib/pq v1.10.8
+	github.com/lib/pq v1.10.9
 	github.com/mattn/go-sqlite3 v1.14.16 // indirect
 	gorm.io/driver/mysql v1.5.0
-	gorm.io/driver/postgres v1.5.0
-	gorm.io/driver/sqlite v1.5.0
+	gorm.io/driver/postgres v1.5.3-0.20230607070428-18bc84b75196
+	gorm.io/driver/sqlite v1.5.2
 	gorm.io/driver/sqlserver v1.5.1
-	gorm.io/gorm v1.25.1
+	gorm.io/gorm v1.25.2-0.20230530020048-26663ab9bf55
 )
 
 replace gorm.io/gorm => ../