Use nunit for unit testing to read configuration files

I encountered such a problem today, I wrote a test project for all the projects (mainly to facilitate testing) CodeManagement), I need to test a module, this module will read the configuration file information, I will deserialize the configuration information to a class, verify that the deserialized class matches the information in the configuration file.
Since previous unit tests did not involve testing and reading applications ProgramConfiguration File Information, So I first thought of writing the configuration information in the nunit GUI application configuration file, because nunit is the host application and other modules are called by him, so reading the configuration information is also read from its configuration file, so it is done, and then run, always red light. After debugging, I found that the configuration information was not read at all. I thought that this configuration file was not read by the tested module, so I found it online again, it is found that the module under test is the host application of the configuration file it reads, so the configuration file name should be the file name of the module under test +. config. If the tested module is ABC. DLL, the configuration file it reads should be ABC. DLL. config
The configuration file is created, run, OK, the green light is on, and the problem is solved.