how to print barcode in asp net c# Detailed Design for the Quote Hotel Price Use Case in Font

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Detailed Design for the Quote Hotel Price Use Case
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As you can see in Figure 10 10, the detailed design for the Quote Hotel Price use case is pretty straightforward. The design does exactly what it says on the tin (or in the use case text, in this case).6
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6 Having said that, we ve omitted the first part of the use case displaying the Hotel Details page from the sequence diagram, as it isn t really within the scope of this refactoring example.
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CHAPTER 10 DESIGN FOR EASIER TESTING
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Figure 10 10. Detailed design for the Quote Hotel Price use case You should already be seeing some big differences between this and the original design. The main change is that there isn t even a HotelPriceCalculator class anymore; the calculating behavior exists as a method on Hotel itself. This follows a key rule of OO design: put the behavior where the data lives. We can now create an outline of our new Hotel class, following along with the design in Figure 10 10. Here s the result (the only bit that isn t shown in the diagram is retrieving the Hotel by its ID): public class Hotel { private String id; public Hotel(String id) { this.id = id; } public BigDecimal quotePrice(int numNights) throws Exception { HotelPriceService service = (HotelPriceService) lookup.get(HotelPriceService.class); BigDecimal pricePerNight = service.fetchPrice(id); return calculateOverallPrice(pricePerNight, numNights); } BigDecimal calculateOverallPrice(BigDecimal pricePerNight, int numNights) { return null; // TODO (see next section) }
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Controller Test: Calculate Overall Price
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The quotePrice() method can be strung together just from the messages shown in the diagram. This leaves us with one method to complete: calculateOverallPrice(), which will do the actual calculation. To test calculateOverallPrice(), let s return to the CalculateOverallPriceTest class that EA generated for us, and complete the controller test method: /** * The system calculates the total price. * @input Price per night, Number of nights * @AcceptanceCriteria The correctly calculated Overall Price should be returned. */ @Test public void testDefaultRunScenario() { Hotel hotel = new Hotel("123"); BigDecimal pricePerNight = new BigDecimal(220.0); int numNights = 5; BigDecimal quote = hotel.calculateOverallPrice(pricePerNight, numNights); assertEquals("The calculated price per night should be 220*5", new BigDecimal(1100), quote); } This test code creates a Hotel object, then calls its calculateOverallPrice() method with a predestined pricePerNight value and number of nights. It then asserts that the value returned is the one expected. Running this straightaway gives us the Red Bar of Angry Marauding Goblins. So we can now fill in the product code to make the test pass: BigDecimal calculateOverallPrice(BigDecimal pricePerNight, int numNights) { return pricePerNight.multiply(new BigDecimal(numNights)); } Now, rerunning the test produces the Green Bar of Hazy Summer Days Spent Fishing by the River altogether more preferable, we think. As we re on a roll, let s also take a look at the other important test case here, Retrieve Latest Price Test.
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Controller Test: Retrieve Latest Price Test
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We re now faced with the problem that we want the code under test to call out to the remote Price Service, but we also want to keep the controller tests self-contained (see 11 for a discussion of controller-level integration tests, which are possible and perfectly valid, but can be difficult to maintain). So we could create a mock HotelPriceService here, and assert that when we tell Hotel to call it, then the mock object gets called. It would look something like this: /** * The system queries the Hotel Price Service for the current price per night * @input The selected Hotel ID * @AcceptanceCriteria The current price per night is returned. */ @Test public void testDefaultRunScenario() throws Exception { HotelPriceService service = mock(HotelPriceService.class); SimpleRegistry.lookup.put(HotelPriceService.class, service); when(service.fetchPrice("123")).thenReturn(new BigDecimal(225.0));
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CHAPTER 10 DESIGN FOR EASIER TESTING
verify(service).fetchPrice("123"); // asserts that the method under test was definitely called Hotel hotel = new Hotel("123"); hotel.quotePrice(5); } But what do we actually gain from this test (Hint: not an awful lot.) If there was some code that genuinely needed a mock object, in order to allow it to be tested, then we would add one. But this is one of those situations where the mock is simply satisfying the test7, and we get the satisfaction of increasing the overall test count, which sounds good when related in the early morning stand-up meeting but provides absolutely no business (or technical) value whatsoever. So we won t do that, then!
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