NullReferenceException on basic test scenario

[stanislavstoyanov99]

I found out a bug when AddRazorRuntimeCompilation() is used on my original Startup.cs class in the ASP.NET Core web project.

I provide more information written as comment in a similar issue from April 2020 - #377:

@ivaylokenov I found out the same problem writing simple test case in order to see the work of the library. Thank you for the "hack", but it will be fine if this bug is solved in the next releases of the library. :)

P.P. @ivaylokenov After making the required changes in #377, I receive the same error: "Object reference not set to an instance of an object.".

Originally posted by @stanislavstoyanov99 in #377 (comment)

[ivaylokenov]

@stanislavstoyanov99 To provide you a fix and new version, I would need the following:

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Startup classes
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Expected behavior
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