Continuous testing streamlines your test-driven development practices in a number of ways. It detects changes that affect unit tests, rebuilds all affected projects, and re-runs all new and outdated tests. Everything is done automatically in the background. Only affected projects are rebuilt; only new and outdated tests are re-run.
Any unit test session can be switched to one of the continuous testing modes in the Unit Test Sessions window.
Continuous testing uses the concept of 'outdated tests' to define tests with currently unknown execution result. Obviously, all tests that have never been executed, were aborted, or did not finish for some reason fall into this category.
Tests that have finished with a definite result (passed or failed) are relevant (not outdated), but only until you make any change in your code. To make sure that there are no more outdated tests after the change, you either need to re-run all tests or re-run tests that were affected by the change.
When continuous testing is enabled, dotCover calculates coverage of all unit tests and monitors changes in the covered code to detect whether any tests become outdated after a change. When a test becomes outdated, dotCover adds the question mark to its icon, e.g. , and changes the status indicator as well.
At any time, you can clear the information about test execution result by clicking Drop Results on the toolbar.
Modes of continuous testing
To select the continuous testing mode means answer two questions:
- How continuous testing will be triggered?
Or, in other words, when will be tests autostarted? After you explicitly build your solution or after you save it? You can select the preferred trigger in the ReShaper options using the main menu .
- What tests will be autostarted and how?
You can select the preferred way on the toolbar in the Unit Test Sessions window using the Autostart Tests toggle button. Possible options are self-explanatory:
- Autostart Tests on [Build | Save]: Run All Tests: all tests are run with no coverage analysis.
- Autostart Tests on [Build | Save]: Run New and Outdated Tests: only new and outdated tests are run with no coverage analysis. This is the most resource-saving mode.
- Autostart Tests on [Build | Save]: Cover New and Outdated Tests: new and outdated tests are run with enabled coverage analysis. This is the most resource-consuming but the most reliable mode. dotCover always keeps coverage information up-to-date.
Scope of continuous testing
Any session in the Unit Test Sessions window can be switched to the continuous testing mode. Therefore, you can have as many continuous testing scopes as many unit test sessions you have.
Continuous testing in action
As soon as you enable one of the continuous testing modes, dotCover will prompt you to run unit tests. After making sure that all your tests are green, you can close the Unit Test Sessions window and go on working on your project. You will be able to see current test status on the status bar of the main Visual Studio window.