CODEWITHSUNDEEP
c#unit-testingnunitparameter-passingprivateobject.invoke
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Reputation: 10577

Unit Test Private Method Using PrivateObject With Multiple Parameters in C#

I have a class ClassA with private method DoSomething like this

private bool DoSomething(string id, string name, string location
  , DataSet ds, int max, ref int counter)

The parameters are of different types and the last parameter is a ref parameter.

I would like to unit test this method and I know I can use PrivateObject to do so. But I am not sure how do I properly invoke this method.

I tried this

DataSet ds = new DataSet("DummyTable");
PrivateObject po = new PrivateObject(typeof(ClassA));
string id = "abcd";
string name = "Fiat";
string location = "dealer";

bool sent = (bool) po.Invoke(
    "DoSomething"
    , new Type[] { typeof(string), typeof(string), typeof(string)
        , typeof(DataSet), typeof(int), typeof(int) }
    , new Object[] { id, name, location, ds, 500, 120 });

, but I get this error

System.ArgumentException : The member specified (DoSomething) could not be found. You might need to regenerate your private accessor, or the member may be private and defined on a base class. If the latter is true, you need to pass the type that defines the member into PrivateObject's constructor.

I think I am doing it all correct but obviously, I am not.

UPDATE AND SOLUTION

Figured it out. Removing Type[] from the Invoke call fixes it:

bool sent = (bool) po.Invoke(
    "DoSomething"
    //, new Type[] { typeof(string), typeof(string), typeof(string)
    //    , typeof(DataSet), typeof(int), typeof(int) } // comment this
    , new Object[] { id, name, location, ds, 500, 120 });

Upvotes: 2

Views: 4585

Answers (1)

pixel
pixel

Reputation: 10577

Remove Type like belove and use Object instead. Also see how to use it in question update above

bool sent = (bool) po.Invoke("DoSomething", 
                new Object[] { id, name, location, ds, 500, 120 });

Upvotes: 3

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