Is it possible to get 100% test coverage?

Is it possible to get 100% test coverage?

“You can have 100 percent coverage with completely worthless tests,” they’ll point out. And they’ll be completely right. To someone casually consuming this metric, the percentage can easily mislead. After all, 100 percent coverage sounds an awful lot like 100 percent certainty.

What is code coverage in Xcode?

Code coverage is a feature in Xcode 7 that enables you to visualize and measure how much of your code is being exercised by tests. With code coverage, you can determine whether your tests are doing the job you intended.

How do I get Xcode code coverage?

You enable code coverage by editing the scheme’s Test action.

1. Select Edit Scheme from the scheme editor menu.
2. Select the Test action.
3. Enable the Code Coverage checkbox to gather coverage data.
4. Click Close.

How do I test code coverage in Xcode?

So, go to the Product menu and choose Scheme > Edit Scheme. Next, choose the Test scheme and activate its Options tab. Finally, check the Code Coverage box, so that Xcode will gather code coverage data while your tests are running.

Is it possible to have 100% code coverage?

All above tests would still pass, code coverage would be 100% but your code doesn’t functionally do what it should. We would need to add multiple tests (covering the same line of code) to guarantee that. Hopefully it is clear now that you should never use code coverage as a goal or KPI (key performance indicator).

What to do if there is no code coverage?

If none of the tests are executed, there’s nothing for code coverage to report. Resolution—In Test Explorer, choose Run All to verify that the tests run successfully. Fix any failures before using Analyze Code Coverage.

Is there a minimum 100% test coverage?

According to Uncle Bob, 100% test coverage is a minimum requirement. In our industy, that is a pretty bold goal, as usually 80% coverage is seen as a practical goal.

Is there a minimum requirement for code coverage?

Some parts of the system may seem too trivial to test, others may require a complicated environment setup to trigger edge cases like timeouts or I/O problems. Also, code coverage by itself is a limited test quality metric (hence it is just a “minimum requirement”). It only tells you what part of the system is not tested at all.