if err := DB.Create(&user).Error; err != nil {
		t.Fatalf("failed to create user: %v", err)
	}

	// Create languages using real database
	langs := []Language{
		{Code: "en", Name: "English"},
		{Code: "fr", Name: "French"},
	}
	for _, lang := range langs {
		DB.FirstOrCreate(&lang, "code = ?", lang.Code)
	}

	// Test Set + Update with many-to-many association
	assocOp := clause.Association{

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