Test As You Type With NCrunch for Visual Studio


Testing/Code Coverage

Using NCrunch to analyse the state of a projects testing after some significant changes.

It’s easy to fall into a trap of seeing high % code coverage numbers and lots of green checkboxes on your tests and feeling like your testing is in a great place.

While high % code coverage on your tests is obviously good it’s important to have a way to easily see these numbers at a glance and see your coverage gaps.


Install the NCrunch extension for visual studio.


Once installed see the NCrunch icon at the bottom right of visual studio.


Checking coverage gaps

After running all your tests check the Ncrunch metrics to see your coverage.


In this example the services hold most of our business logic so I want to have a look now at each service to spot gaps that should be covered by testing.

Easily spot code not covered by any test with the white markers. In this example we are simply throwing an exception to display an error message to the user. At a glance I can see that this is a low priority gap.


Finding high priority code that isn’t covered in the same service. Can see at a glance that although the function is tested our model now has a new list that needs to be managed “JobRoleLinks” and we will need to write tests to cover this new functionality.


Even with high test coverage % and making sure each function was tested it would have been very easy to not test how the new list of objects on our model is being handled.

Checking for performance issues

After test execution check hotspots section to find potential performance issues in the code.

These sections of code may take a few milliseconds during testing but how will they function with much larger data sets in a live environment?


IDE Performance

As with a lot of these tools they require a lot of overhead and can slow down your IDE.

If the IDE is suffering simply disable the extension until test/performance analysis is needed.

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