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CHAPTER 10 DESIGN FOR EASIER TESTING
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of PriceStreamer and other objects. If there were any further code in this class, or (shudder) actual business logic, then we would be thumbing through our Yellow Pages for a local Rent-a-Deity to smite the Registry class down from on high, leaving nothing but a couple of smoking boots where it once stood. (Or call on Ixtab the suicide goddess if she s available for parties). The benefit of the keep-it-simple approach in this section can be seen straightaway in the more robust unit test setup. Remember that the tests don t need to use the Registry, as they want a fresh copy of PriceStreamer so that each test remains deterministic: @Before public void setUp() throws Exception { streamer = new PriceStreamer(); } The two test methods quotePrice_PriceAdded() and quotePrice_NoPriceYet() remain unchanged, but the order in which they re run no longer matters. Result: more robust tests, which shouldn t randomly fail just because they re executed in a different order.
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5. Keep Your Classes Decoupled
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In 9 we illustrated the problem of code that is too tightly bound to its dependencies. In the example, HotelPriceCalculator was difficult to test because it assumed a particular implementation of PriceStreamer. The solution if we definitely want the test to just be about HotelPriceCalculator, and not to be affected by the implementation of PriceStreamer is to pass in a stubbed-out version, which will return a price for one night at hotel 123, which the method under test can then use in its calculation. Using the combined magic of Mockito and Java reflection, this is as simple as the following: PriceStreamer streamer = mock(PriceStreamer.class); when(streamer.quotePrice("123")).thenReturn(new BigDecimal(225.0)); The first line creates a mock instance of PriceStreamer. The second line configures the mock so that when its quotePrice() method is called with 123, it ll return 225.0. We also need a way to tell HotelPriceCalculator to use this version, without going overboard on Inversion of Control frameworks or otherwise increasing the code s complexity. Luckily, we ve already separated out the initialization code, so it s a simple case of the test not calling calc.initPriceStreamer(), and instead just assigning the mock streamer into the calc.streamer field. Here s the complete test: public class HotelPriceCalculatorTest { HotelPriceCalculator calc; PriceStreamer streamer; @Before public void setUp() throws Exception { streamer = mock(PriceStreamer.class); calc = new HotelPriceCalculator(); calc.streamer = streamer; } @Test public void calculatePrice() throws Exception { Hotel hotel = new Hotel("123");
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CHAPTER 10 DESIGN FOR EASIER TESTING
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when(streamer.quotePrice("123")).thenReturn(new BigDecimal(225.0)); // Calculate the total price: BigDecimal price = calc.calculatePrice(hotel, 3); } assertEquals(new BigDecimal(675.0), price);
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HotelPriceCalculator is also looking nice and straightforward now, far removed from the bamboozling mess that you saw in 9. Here s the relevant code for the calculatePrice() test (the complete class isn t much bigger than what you see here): public class HotelPriceCalculator { PriceStreamer streamer; public void initialize() { initPriceStreamer(); } private void initPriceStreamer() { this.streamer = new PriceStreamer(); SimpleRegistry.lookup.put(PriceStreamer.class, streamer); } public BigDecimal calculatePrice(Hotel hotel, int numNights) { Object id = hotel.getId(); BigDecimal pricePerNight = streamer.quotePrice(id); return pricePerNight.multiply(new BigDecimal(numNights)); }
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4. Keep Business Logic Out of the UI Code
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If you recall from 9, we had a Flex/MXML-based Hotel Search screen. Now that the use case is better understood, it s obvious that this screen was just completely wrong. To match the use case, the user has already found the hotel, and wants to see prices for it. To recap, here s the basic course:
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The system displays the Hotel Details page. The user types in the number of nights he would like to stay for, and clicks the Calculate button. The system calculates the price based on the cost per night, and displays the result.
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Figure 10 7 shows a screenshot of the component implementing the use case. The user sees a simple web page showing a photo of a nice hotel room, the price per night, and the total price for the user s planned stay.
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