Is possible to property to a message in ExpectedException?

Question

I'm trying to validate the exception and message returned, but i have a file name in this message that is variable. Is possible to do that using unit test in just one method?

public static string FileName
        {
            get
            {
                return "EXT_RF_ITAUVEST_201605091121212";
            }
        }

        [TestMethod()]
        [ExpectedException(typeof(Exception), String.Format("Error on file {0}", FileName))]
        public void ValidarNomeArquivo_DataNomeIncorreta_Mensagem()
        {
            throw new Exception(String.Format("Error on file {0}", FileName));
        }

The code above return the error "An attribute argument must be constant expression, typeof expression or array creation expression of an attribute parameter type.".

Answer 1

In your situation I would not use ExpectedException and instead just manually do the logic it does.

    public static string FileName
    {
        get
        {
            return "EXT_RF_ITAUVEST_201605091121212";
        }
    }

    [TestMethod()]
    public void ValidarNomeArquivo_DataNomeIncorreta_Mensagem()
    {
        //This try block must contain the entire function's logic, 
        // nothing can go after it to get the same behavor as ExpectedException.
        try
        {
            throw new Exception(String.Format("Error on file {0}", FileName));

            //This line must be the last line of the try block.
            Assert.Fail("No exception thrown");
        }
        catch(Exception e)
        {
            //This is the "AllowDerivedTypes=false" check. If you had done AllowDerivedTypes=true you can delete this check.
            if(e.GetType() != typeof(Exception))
                throw;

            if(e.Message != String.Format("Error on file {0}", FileName))
                throw;

            //Do nothing here
        }
    }