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A systematic approach to developer testing maximizes your ability to detect errors of all kinds with a minimum of effort. Be sure to cover this ground: Test for each relevant requirement to make sure that the requirements have been implemented. Plan the test cases for this step at the requirements stage or as early as possible preferably before you begin writing the unit to be tested. Consider testing for common omissions in requirements. The level of security, storage, the installation procedure, and system reliability are all fair game for testing and are often overlooked at requirements time. Test for each relevant design concern to make sure that the design has been implemented. Plan the test cases for this step at the design stage or as early as possible before you begin the detailed coding of the routine or class to be tested. Use basis testing to add detailed test cases to those that test the requirements and the design. Add data-flow tests, and then add the remaining test cases needed to thoroughly exercise the code. At a minimum, you should test every line of code. Basis testing and data-flow testing are described later in this chapter.

Listing 9-23. Results from a standard ORDER BY clause select , from ename sys_connect_by_path(ename,'|') as path employees

Build the test cases along with the product. This can help avoid errors in requirements and design, which tend to be more expensive than coding errors.

9

Developers sometimes wonder whether it s better to write test cases after the code has been written or beforehand (Beck 2003). The defect-cost increase graph suggests that writing test cases first will minimize the amount of time between when a defect is inserted into the code and when the defect is detected and removed. This turns out to be one of many reasons to write test cases first: Writing test cases before writing the code doesn t take any more effort than writing test cases after the code; it simply resequences the test-case-writing activity. When you write test cases first, you detect defects earlier and you can correct them more easily. Writing test cases first forces you to think at least a little bit about the requirements and design before writing code, which tends to produce better code. Writing test cases first exposes requirements problems sooner, before the code is written, because it s hard to write a test case for a poor requirement. If you save your test cases (which you should), you can still test last, in addition to testing first.

start with mgr is null connect by prior empno = mgr order by ename; ENAME -------ADAMS ALLEN BLAKE CLARK FORD JONES JONES KING MARTIN MILLER SCOTT SMITH TURNER WARD PATH -----------------------------|KING|JONES|SCOTT|ADAMS |KING|BLAKE|ALLEN |KING|BLAKE |KING|CLARK |KING|JONES|FORD |KING|JONES |KING|BLAKE|JONES |KING |KING|BLAKE|MARTIN |KING|CLARK|MILLER |KING|JONES|SCOTT |KING|JONES|FORD|SMITH |KING|BLAKE|TURNER |KING|BLAKE|WARD

All in all, I think test-first programming is one of the most beneficial software practices to emerge during the past decade and is a good general approach. But it isn t a panacea, because it is subject to the general limitations of developer testing, which are described next.

Presentation lightbox, and you ll see thumbnails of all the images you selected in your search in a single space, as shown in Figure 9-7.

Developer tests tend to be clean tests Developers tend to test for whether the code works (clean tests) rather than to find all the ways the code breaks (dirty tests). Immature testing organizations tend to have about five clean tests for every dirty test. Mature testing organizations tend to have five dirty tests for every clean test. This ratio is not reversed by reducing the clean tests; it s done by creating 25 times as many dirty tests (Boris Beizer in Johnson 1994).

This section introduces the concept of analytical functions, which are a very powerful part of the ANSI/ISO SQL standard syntax. Analytical functions enable you to produce derived attributes that would otherwise be very complicated to achieve in SQL. Rankings, Top N reports, and running totals are all possible using analytical SQL. Not just possible, but the resulting statement is clear and performance is usually better than multiple-pass statements. Earlier in this chapter, in Section 9.2, you saw how subqueries in the SELECT clause allow you to add derived attributes to the SELECT clause of your queries. Analytical functions provide similar functionality, though with enhanced statement clarity and improved performance.