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JustMock and System.Drawing.Printing.PrintDocument

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Hesham Desouky
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Hesham Desouky asked on 03 Dec 2012, 12:28 PM
I tried to use JustMock Replace technique to replace the Print method of  System.Drawing.Printing.PrintDocument.

In class Initialize
Mock.Replace<System.Drawing.Printing.PrintDocument>(p => p.Print()).In<PrintJobTest>(t => t.Ensure_Print_Job_Folder_Name());

and in my unit test method arranged the PrintDocument.Print as follows:

var printDocument = new System.Drawing.Printing.PrintDocument();
Mock.Arrange(() => printDocument.Print()).IgnoreInstance().DoNothing();

When PrintDocument object instatiated under the class to be tested, it throws the following exception when calling the PrintDocument.Print method

Could not load file or assembly 'Telerik.CodeWeaver.Api, Version=, Culture=neutral, PublicKeyToken=87210992829a189d' or one of its dependencies. The system cannot find the file specified.

This error occurs when running the test using MSTest runner, but if I used JustCode test runner everything run ok and no exception thrown

And no errors in the event viewer regarding the profiler:
.NET Runtime version 4.0.30319.17929 - The profiler was loaded successfully.  Profiler CLSID: '{b7abe522-a68f-44f2-925b-81e7488e9ec0}'.  Process ID (decimal): 6368.  Message ID: [0x2507].

Is this a problem whenmocking the System.Drawing.Printing.PrintDocument?

Please help I am facing many troubles with JustMock and my unit tests using MSTest runner.

If this a test runner problem, do you suggest a replacement?

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Telerik team
answered on 05 Dec 2012, 03:41 PM
Hello Hesham,

Thank you for bringing this issue to us.

You do not need to use Mock.Replace in order to mock the "System.Drawing.Printing.PrintDocument" class. Mock.Replace is used for mocking MSCorlib members, you could read more about it here.

To demonstrate you how the PrintDocument class could be faked, I made the following example class:
public class MyClass
    public void PrintingDocument(System.Drawing.Printing.PrintDocument doc)

Now, in our test method I will check if the doc.Print() is actually been called. I`m also arranging that it should be called exactly once, like this:
public void TestMethod1()
    var mock = Mock.Create<System.Drawing.Printing.PrintDocument>();
    var newMyClassInstance = new MyClass();
    bool isCalled = false;
    // Arrange
    Mock.Arrange(() => mock.Print()).DoInstead(() => isCalled = true).OccursOnce();
    // Act
    // Assert

Note that, I`m using MSTesting framework and the test is behaving as expected.

I must object that, our product is well integrated in working with MSTest runner. Still, I could also recommend you using JustCode testing framework, NUnit or TestDriven.NET.

You are always welcome to check our online help documentation, in which you will be able to find much more information and examples concerning JustMock.

I hope this answers your questions. Just ask, if there is anything else I could help you with.

the Telerik team
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