I’m working on an app that integrates with a 3rd party web service. I currently have separate integration / regression tests that call the web service to do the following:
- Modify Policy – Add Vehicle
- Modify Policy – Remove Vehicle
- Modify Policy – Add Multiple Vehicles
- Modify Policy – Add Insured
- …
Most of these tests were created as bugs were found & fixed. The 3rd party web service is slooow and I’m trying to speed the testing process up. Because each test calls the web service, combining them into one test that only calls the web service once would make things much faster.
Would combining these tests be bad practice because each test was written for a specific bug? My concern is that a mistake in refactoring could potentially allow a bug to be re-introduced later on.
Yes, combining them would be a bad practice. Think instead about how to mitigate the risk without combining the tests. One approach – probably your best bet – would be to mock out the web service, so that the tests are much faster without jeopardizing their ability to detect a regression. Another would be to split your slow regression tests into their own suite that is run less frequently (but still frequently enough!) than your usual set of tests. Finally, you could combine them – but I would recommend explicitly reintroducing all the original bugs into your code to verify that the combined test still detects them.
Specific, pointed, direct, unit tests are very valuable; it’s nice to know exactly what has broken. Combining tests compromises that value.