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TABLE 14.1
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THREE PROPOSED SOLUTIONS TO PREVENT A FLOODED BASEMENT SOLUTION 1: DIG UP SIDE OF HOUSE AND REPLACE WEEPING TILES AND DRAINPIPE SOLUTION 2: PREVENT WATER FROM POOLING AGAINST SIDE OF HOUSE BY IMPROVING EAVES TROUGH AND BUILDING UP EARTH BESIDE HOUSE SOLUTION 3: INSTALL SUMP PUMP IN BASEMENT
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Approximate cost Homeowner effort Elapsed time to implement repair Ability to test corrective action
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Simple; should see water no longer pooling when hosing down side of the house Minimal but trench danger to dogs/children Good
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Simple; should see water no longer pooling when hosing down side of the house Moderate
Moderate; will continue to have water pooling but should not have ooding during testing Minimal
Possible damage from dogs Likelihood of success
Very good
Unknown
and her children did not play in the backyard, so the safety concerns that I had weren t an issue for her. This brings up an important point: What is obviously the best solution for you is not necessarily the best solution for other people. If you are working on a team or there are others involved in the issue, you will have to discuss the important issues relating to the problem and agree on their importance in the decision-making process.
Test Fixes
If you have followed the steps that I have outlined here, you will nd that testing your x is very straightforward you merely have to look for the sequence of events that leads up to the invalid state, repeat them, and then evaluate the results against the expected state of the system. When you characterized the problem, you will have created a set of requirements to ensure that the sequence of events that resulted in the failure will be
TEST FIXES
recreated. You also should be able to see whether or not the corrective action affects any other aspects of the application. By following the process outlined here, you will have produced the test cases most likely to demonstrate whether or not the selected x eliminates the problem. I tend to avoid using the term testing a x and instead prefer stating that this step is verifying the system with the corrective action performs as expected the problem with this statement is that it makes a lousy section title. I also would recommend that you eschew thinking of testing xes because it limits you to just looking at the individual problem at hand and not at whether or not the x has resulted in other problems. Chances are that you have already created xes for problems that have resulted in problems elsewhere in the application this is particularly easy to do in microcontroller applications, where there are multiple activities taking place at a given time. Remember that your test will be the steps taken to characterize the problem in the rst place, as well as all the other tests that you have made to test the application. This process is often referred to as regression testing, and it is an invaluable tool for making sure that when you have said you have xed the system, you can demonstrate that you actually have done so. What is important in this process is that as part of characterizing the issue, the sequence of events that was used to bring out the problem is added to the entire set of tests that you use to test the system. When you use the term verifying the system with the corrective action performs as expected, this doesn t limit you to looking at just the original problem; it means that you will look at the overall operation of the system to make sure that no other issues have appeared. I m sure that when you have tried xing something, you have experienced other problems surfacing, which in itself is disheartening, but it gives you an opportunity to look at the situation and decide on two paths for resolving it. The rst is to go back and look at your corrective action (as well as the other options that you considered) and decide if it really was the appropriate response to the original problem. The second is to look at the failure and decide whether or not it is a separate problem on its own. When you are new to programming and application development, it isn t unusual to have multiple problems that involve common hardware or functions, and when one problem is xed, others are highlighted. By taking the perspective of the entire system and performing regression tests for each bug x, you are continually challenging the overall quality of the system. Going back to my house, I had a two-part test. The rst part was taking a hose and verifying that water ran away from the back of the house and didn t pool there. The second part was waiting for rain and verifying that the xed eaves and downspout directed the water away from the back of the house. The two-layer x that I applied minimized the opportunity that water would be directed to the side of the house, and even if it were, the slope of the land would carry it away.
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