c# - .Net Fakes - How to shim an inherited property when the base class is abstract? -

i trying write unit test covers following line

var filefullname = fileinfo.fullname; 

where fileinfo instance of fileinfo.

i using fakes shim fileinfo object, unable provide value fullname property, because inherited base class.

for name property, not inherited, can this:

shimfileinfo.allinstances.nameget = info => originalfullname; 

the answer provided microsoft create shim on base class, in case filesysteminfo. if try this:

shimfilesysteminfo.allinstances.fullnameget = info => originalfullname; 

it not work, because filesysteminfo abstract class cannot created , therefore cannot shimmed.

in particular case, can around because can combine directoryname , name properties make testable, seems crazy can't use property want because happens come base.

has come accross problem , managed solve it?

you said shimming base class didn't work, , works in our tests.

fileinfo in system.dll defined fileinfo : filesysteminfo, , filesysteminfo in mscorlib. many types in mscorlib not shimmed default, if add mscorlib.fakes file:

<fakes xmlns="http://schemas.microsoft.com/fakes/2011/">   <assembly name="mscorlib" version="4.0.0.0"/>   <shimgeneration>     <add fullname="system.io.filesysteminfo"/>   </shimgeneration> </fakes> 

and build test project shimfilesysteminfo filesysteminfo mscorlib, shimfileinfo fileinfo system.dll. works:

using (shimscontext.create()) {     var directoryname = "<testpath>";     var filename = "test.txt";     shimfilesysteminfo.allinstances.fullnameget = @this => "42";     result = new directoryinfo(directoryname).getfiles(filename).first();     assert.areequal("42", result.fullname);   // fake fullname     assert.areequal("test.txt", result.name); // real name } 

caveat: works on machine (visual studio 2013, .net 4.5.1)

reference fakes file: code generation, compilation, , naming conventions in microsoft fakes