The Order Book builds for .NET 10, it starts, and one test is red. Does that mean it is “on .NET 10”? In many projects this is the point where people say “done” because the program runs, and three weeks later someone reports that the customer list looks different. This lesson closes module 2 properly: with a list of what “done” means, with a decision about the red test, with a comparison of the old and the new version, with shipping, and with a way back.
When is it done?
| Criterion | How you check it | Met when |
|---|---|---|
| It builds | dotnet build, read the exit code |
exit code 0, no new warnings that you can't explain |
| The tests are green | dotnet test, read the exit code |
exit code 0; every deviation is decided and documented |
| It runs | start the program, open all forms | nothing crashes, exports and printing work |
| It looks right | the checklist, by hand | size, font, customer card and print preview are right |
| It is no worse | measure startup and loading, old against new | within the limit you set beforehand |
| It can be shipped | publishing on a clean machine | the program starts there |
| There is a way back | fallback practiced once | the old version runs again within minutes |
A criterion counts only if you can check it. “Feels fast” is not one.