C#•5mo ago

Is it possible to change values in a file based on output of unit tests automatically?

Hello, say I perform a unit test. What happen in that unit test is that some values are read from a file, say a csv file then compared with calculated value. IF calculated value doesn't match the value read from the file, which is expected value, I need to change the expected value to the calculated value.

I wanted to know if it's possible to automate such a process. Like the unit test generate a report with name of file and the errors it encountered, then I have a program opening that file and modifying the values dynamically. It seem possible, just the unit test generating a report I don't really know if we can do that. Anyone has an idea please.

Pobiega•8/9/25, 7:19 AM

This sounds almost like a snapshot test to me?

Pobiega•8/9/25, 7:20 AM

So perhaps look that up and see if that matches what you want, and in that case find a good snapshot testing library to use

Pobiega•8/9/25, 7:20 AM

and the "report" is built in, when you run UTs you get a list of tests that failed

PPobiega This sounds almost like a snapshot test to me?

FakerOP•8/9/25, 8:20 AM

ah ok didn't know that type of testing

FakerOP•8/9/25, 8:20 AM

I will have a look and come back

PPobiega and the "report" is built in, when you run UTs you get a list of tests that fail...

FakerOP•8/9/25, 8:20 AM

yeah but it's in the console, I don't know how to access that

canton7•8/9/25, 11:54 AM

Yeah, snapshot testing. I've used Verify, worked well: if the test fails it launches a diff tool to view/merge the differences, there are commands to overwrite all snapshots with what the tests actually generated, etc

FakerOP•8/9/25, 2:12 PM

ok I will have a look, ty !

Is it possible to change values in a file based on output of unit tests automatically?

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