background

Telerik JustMock

Mock DLL Imports

  • JustMock allows you to easily mock methods marked with the DLLImport attribute and test your code in isolation from such dependencies.
  • Part of the fastest, most flexible and complete mocking tool for crafting unit tests.
  • Our award-winning support team is available to assist you with any issues.
Download free trial
Buy now
Mock everything

  • Mocking DLL Imports Overview

    The DLLImport is a storage class attribute that represents a Microsoft-specific extension to the C and C++ languages. With such extensions, you can import C and C++ DLLs and use them in C# or VB code. This inevitably makes your code dependent on calls to the C or C++ API.

    JustMock allows you to easily mock methods marked with the DLLImport attribute and test your code in isolation from such dependencies.

    public class Foo 
    

    { 
    

        [DllImport("Kernel32.dll")] 
    

        public static extern int GetCurrentProcessId(); 
    

    }
    

     
    

    ...
    

     
    

    [TestMethod] 
    

    public void FormatCurrentProcessId_OnExecute_ShouldReturnExpected() 
    

    { 
    

        var expected = 3500; 
    

      
    

        // Arrange 
    

        Mock.Arrange(() => Foo.GetCurrentProcessId()).Returns(expected); 
    

      
    

        // Act 
    

        var myFoo = new Foo(); 
    

        var actual = myFoo.FormatCurrentProcessId(); 
    

      
    

        // Assert 
    

        Assert.AreEqual(string.Format("The current process ID is {0}", expected), actual); 
    

    }

    Mock DLL Imports documentation
Next Steps