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Once you convert the state into a string buffer, you send it to the server using the method request.post. The method request.post is an HTTP POST request, fulfilling the requirements of REST. When the request.post method responds, the method request.complete is called. In the anonymous method implementation of request.complete, the returned buffer is formatted using JSON. To convert the JSON buffer into a state, you call the method JSON.parse. You assign the returned state to the variable response. The state contains the value of the addition, and the value is tested using the method assertEquals. If the value is not 3, then the testing framework triggers, catches, and processes an exception. Without going into the details of the server side yet, and assuming that the server side is working, Figure 1-14 shows the results of running the tests.
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Figure 1-14. Running the tests with all tests being successful
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Figure 1-15 illustrates what a failed test looks like.
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Figure 1-15. Running the tests with one of the tests failing With either example, you can see which tests were successful and which tests failed. When a test fails, an error states why the test failed. Additionally, informational messages are generated so that you know what your tests are doing and what data is being sent. The test is written as a single test and doesn t constitute a complete contract test. When you implement the client-side tests of your contract, you ll want to employ test-driven development techniques that include tests that succeed and tests that fail. Now let s shift focus from the client side to the server side. You don t want to implement a complete working server-side implementation, but rather implement the Mock URL layer. For the scope of this solution, Java is used. The purpose of the Mock URL layer is to imitate and implement server-side functionality. Imitating and implementing server-side functionality is tricky, because you can only implement targeted test cases. In the case of the example, that means implementing the case of adding 1 and 2. Of course, the addition of 1 and 2 is trivial, and in the case of the Mock URL,
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you could implement it within seconds. However, there are more complicated cases, so you shouldn t be tempted to provide a solution. The focus of the Mock URL layer is to provide correct requests and responses for specific tests. By implementing logic, you re setting yourself up for an error because the logic needs to be tested. Let s put it this way: Imagine implementing the trivial addition of two numbers. How do you know that your implementation will work properly The answer is that you write tests. However, that doesn t answer the question properly, because how do you know that the tests are implemented properly The answer is that you don t, and that is the purpose of the Mock URL layer. The following source code implements the request and response of the add contract. Source: /jaxson.java.tests/devspace/jaxson/tests/calculator/mockurl/DoMockAdd.java public class DoMockAdd extends MockUrlTestCaseBase { public void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException { assertAreEqualJSONObject( request, "requestadd.json"); try { FileWriter.writeFileObject( "application/json", response, "responseadd.json"); } catch( Exception e) { throw new ServletException( "Could not write file response", e); } response.setStatus( 200); } } Two method calls are shown in bold. The method assertAreEqualJSONObject compares the sent data stored by the Java servlet to the file requestadd.json. If the sent data matches the contents of the file, then the next method call writeFileObject is executed. The purpose of writeFileObject is to send the contents of the file responseadd.json to the client. The files requestadd.json and responseadd.json represent predefined contracts used to add two numbers together. The class DoMockAdd has no idea what the purpose of the operation is. It only knows that if the request matches a file, then a response based on another file is sent. The Mock URL layer implementation is simple but can only deal with a single case of adding two specific numbers and generating a single response. In the Mock URL layer example, you perform multiple tests to see which test case is matched. If a test case is matched, then the appropriate response is sent. If no test cases matches, then no response is sent, and an error is generated. The method assertAreEqualJSONObject compares the JSON data that is sent to the JSON data in a file. Don t be misled into believing that a byte-to-byte comparison is performed. The method assertAreEqualJSONObject performs a logical comparison based on the format of the data. This is important because otherwise, whitespace or other characters that don t influence the state of the data could cause a test to fail. You don t want a test failing because of a different formatting, unless of course you desire testing a specific formatting of the data. For example, XML is another technology where most likely you don t want whitespace to cause the test to fail.
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