Микромомент в юнит тестировании

Which one should I do?

    public void checkCalculation() {
        Product product = new Product(10, 10);

        String totalSum = model.calculateSum(product);

        String expected = "100 руб."; // #1 способ
        assertThat(totalSum).isEqualTo(expected); // #1 способ

        int expectedValue = getString(R.string.total_sum, 100); // #2 способ
        assertThat(totalSum).isEqualTo(expectedValue); // #2 способ
    }

    public int calculateSum(Product product) {
        int total = product.getCount * product.getPrice;
        return getString(R.string.total_sum, total);
    }
    
    ...
    // Resources
    <string name="total_sum">#%s руб.</string>