In response to my own problem from near the end...
I have a lot of reading to do to see if any of these will work for me but I have found several possibilities for automated unit testing of embedded c code. Check (http://check.sourceforge.net/) is a framework and decent set of tutorials for doing unit testing in C. Even better they link to all the other frameworks they know of, so if check doesn't cut it for me, they've already given me a list for further research.
@DaveWR, Thanks. WE are just at the beginning of needing to clean up our code. I walked into a project with a >10,000 line file. Some case statements in that file are >200 lines each inside functions that are >2,000 lines. Yikes! (And I'd just love to know what kind of cyclomatic number it comes up with. My guess: >10. ;-) )
@TOCARD: I only use metrics on large projects. In the last few years they have not been useful. I cleaned up our code and design. End of of problem. ;-) However I occasionally run them to make sure we are on track still.
Added bug - in the book "mythical man-month" they describe a situation where fixing a bug causes something else to break and a point is reached for a given large code base there is a irreducible number of bugs per number of lines. While this is depressing pessimistic it does point to the value of a good test suite (perhaps automated so using it is painless) and discipline to use it.
I have been tasked before to review a application and analysed 1. the number of different programmers and the number of major patches that were made to the code. That's why I push for coding standards on my projects.
@StephT The problem tends to be that most of the code in my systems drivers HW. It seems liek to automate I need to either write a SW simulator of componets we've bought from their 500 page data sheet, or build something that can analyze the output past the 3rd party HW or as a standin for the HW
@dgkohler, A manager might ask programmers to document minimalist code by writing it out in a more understandable way, then commenting out the expanded method. That way, the elite genius gets his way while passing on the intent.
Question: Does the Cyclomatic Complexity have any correlation to code's readability? You previously mentioned people to take pride in reducing their codes to minimalistic lines that are very difficult to discern the intent of... It appears that is out of the scope of CC.
So unit testing on embedded systems could be done with tools like cpputest or even scripting tools. The level of testing is often decided based on the product you are developing. Odds are a toothbrush is being unit tested
Testing completeness can be measured a number of ways but one way is a % of paths and branches within the software that is covered. Some IDE's will let you run your code in debug, interact with the system and then provide you with the report of what was executed, what wasn't, etc. Pretty neat.
No, not formally. I've played around with Understand by Scitools for one more complex project - it has cyclomatic complexity among many other useful things. cc etc. did help me understand (hehe) my code better and see what were the hairiest parts.
I may not intensionally used Cyclomatic Complexity testing. But I have done manual exhaustive Testing of all possible control paths. Especially for small embedded software projects. Never used any tools for such testing.
We generate the test cases multiple ways. QA first generated test cases for all commands with varies parameters per our command specification. Firmware also recommends test cases based off of inside knowledge of code which will drive the execution of code normally not executed.
We used fault based testing. Test cases are written against the requirements and product features. A combination of white and black box testing is accomplished. This is all done by our software quality group.
Nope continuous integration. Hard to think and answer question when the presentation goes right on after asking question. Our size of embedded systems rarely involve more than one developer, and simply compiling catches some errors. Automated regression etc. testing would be nice but may be more work than it's worth, at least until the firmware is close to complete.
All three cycles: we find the lowest cost solution is Unit testing while Integration is more costly and System testing is the most expensive solution. Failures discoverd during system testing are difficult to identify and harder to resolve.
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From design feasibility, to development, to production, having the right information to make good decisions can ultimately keep a product from failing validation. The key is highly focused information that doesn’t come from conventional, statistics-based tests but from accelerated stress testing.
There’s a good chance that a few of the things mentioned here won't fully come to fruition in 2015 but rather much later down the line. However, as Malcolm X once said, "The future belongs to those who prepare for it today."
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