Mocking in Unit Tests
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by Brian Mains
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Reflection

The .NET Framework has the ability to reflect and gather metadata about types in an assembly.  The Type class has several methods define that return objects representing a property, method, etc.  These objects are suffixed with -Info and are defined in the System.Reflection namespace.  For instance, if you wanted to get properties of a class, you use GetProperties() to get a list of properties or GetProperty() to get a specific named property.  For each object the type class has these methods defined or you can use GetMember()/GetMembers() to get the MemberInfo objects you may be looking for.

Reflection has some capabilities to get/set values, which help in getting/setting values for an object.  You can somewhat mock a property value because you can change it to be whatever you want to test it as.  This is the capability I build into a Reflection Mock class that made it easier to perform logic mocking in unit tests, but is far short of an actual mock class.

See the Reflection overview for more information.


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