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sumRange(a1, a1 + a2); assertEquals("sumRange results are equal", resNow, resOld); break; } } } } It s appropriate to use randomized tests here, because they can simply generate a random sequence of calls, while applying them to both the implementations at once In the process, you are verifying that they both produce the same results You can use not only randomized tests, but also any other type of tests, and they ll still verify that the new behavior appropriately reproduces the old one On the other hand, the randomized tests have a nice feature with respect to the amoeba model As described in the section Functional Compatibility the Amoeba Effect in 4, the actual behavior of an application is always different from the specification or our expectations In general, testing is useful to automatically verify that the functionality requested by the specification is implemented.

Before you do anything else, you should start by assembling your weather station following the manufacturer s instructions and make sure it works with the original receiver/display module. You don t need to actually fit it to your roof yet, but at least plug it all together, put in the batteries, and check that the receiver sees values coming back from the sensors. La Crosse systems start up in a rapid-update mode where they transmit sensor data very frequently for the first 15 minutes or so of operation to make it easy to test. After that, they drop back to a power-saving mode where they only send updates about every five minutes, so if it looks like things are working initially and then the updates unexpectedly stop, don t panic. The system hasn t broken. It has probably just gone into low-power mode and you need to wait longer for each set of data to come through. You can switch it back to rapid-update mode by popping out a battery from the transmitter and putting it back in again, but each time you do that you then need to press the reset button behind the receiver/display module so it can reassociate with the transmitter. Each transmitter sends a station ID as part of every update. The ID changes randomly each time it powers up, so after it is reset the receiver watches for the first station ID it sees and latches onto it. It then only accepts updates containing that particular ID until the next time it is reset.

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This is easy: if the specification says something will work, then write a test, run it, and if it fails, fix the implementation If the specification requires that for some values a function should yield an exception, then write a test, verify that an exception is really thrown, and if not, fix the implementation..

La Crosse systems transmit their updates on the unlicensed 433MHz band, so this project uses a shield with a 433MHz receiver module (shown in Figure 13-5) to feed the raw data stream to the Arduino where the bitstream is then processed and decoded in software. The shield is, therefore, quite simple and will work perfectly well with other 433MHz projects, while the software is relatively complex and does all the heavy lifting. You can use this exact same shield to process data from a wide variety of devices simply by changing the software on the Arduino.

password1 = forms.CharField(max_length=30, widget=forms.PasswordInput(render_value=False)) password2 = forms.CharField(max_length=30, widget=forms.PasswordInput(render_value=False)) The render_value argument to the PasswordInput tells it that even if it has some data, it shouldn t show it. An error entering the password should completely clear the field to make sure the user types it in correctly the next time.

On the other hand, our application can also do more than the specification says. This is dangerous as well, as this can create security holes or prevent future evolution of the library. That s because the future attempt to fix the library s behavior to match the specification is introducing an incompatible change against the previous although unspecified behavior. That is why finding out where the application does more than specified is important. However, this is not easy. The usual testing style won t help, as common tests can only verify expected behavior. This is exactly the place where randomized tests excel. To some extent, they are able to discover an unexpected behavior, as they are able to employ the randomness of its operations and create a sequence of steps no developer or quality engineer would write. These tests cannot cross their own shadow and invent a completely new way to use the API. The frame the set of available operations is given and the tests can only execute them in inventive sequences. Still, random exploration is useful as it can stretch the API to its limits.

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