Mocking System.IO.Directory operations in Nunit using Rhino mocks

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Hi I have following method in my class and I want to write unit test for it using nunit and rhino mocks. My method moves all the folders from source path to destination path, I am new to NUnit and Rhinomocks and I dont know how to mock System.IO.Directory or System.IO.DirectoryInfo objects. I have tried everything on google.

C#

public void MoveDirectories()
{
    var dirList = (from f in new DirectoryInfo(sourceDir).EnumerateDirectories("*")
                   select f).ToList();

    destinationDir = destinationDir + "//" + newDir;

    foreach (var d in dirList)
    {
        if (GetWeekOfYear(d.CreationTime) == weekNo)
        {
            if (!Directory.Exists(destinationDir))
            {
                Directory.CreateDirectory(destinationDir);
            }

            if (!Directory.Exists(destinationDir + "//" + d.Name))
            {
                Console.WriteLine("Move Folder  " + d.FullName + " TO " + destinationDir + "//" + d.Name);
                Directory.Move(d.FullName, destinationDir + "//" + d.Name);
            }
        }
    }
}

Here GetWeekOfYear returns the Week number for a current date or date supplied.
If any one can help me this.

Posted 4-Aug-13 22:39pm

mitesh_a

Updated 4-Aug-13 22:48pm

Joezer BH

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Fredrik Bornander · Accepted Answer · 2013-08-04T23:38:00

You wrap the calls to static methods on DirectoryInfo in a class of your own that implements an interface.

Something like this;

public interface IDirectoryManager
{
    bool Exists(string path);
    DirectoryInfo Create(string path);
    void Move(String sourceDirName, String destDirName);
    IEnumerable<DirectoryInfo> EnumerateDirectories(string path, string searchPattern);

}

public class DirectoryManager : IDirectoryManager
{
    public bool Exists(string path)
    {
        return Directory.Exists(path);
    }

    public DirectoryInfo Create(string path)
    {
        return Directory.CreateDirectory(path);
    }

    public void Move(string sourceDirName, string destDirName) {
        Directory.Move(sourceDirName, destDirName);
    }

    public IEnumerable<DirectoryInfo> EnumerateDirectories(string path, string searchPattern) {
        var dir = new DirectoryInfo(path);
        return dir.EnumerateDirectories(searchPattern);
    }

}

Then, in you class that implements your MoveDirectories method, you have that class take an IDirectoryManager instance in its constructor and then only use that in the MoveDirectory method.

Something like this (obviously with all you current members and parameters also there);

C#

class YourClass {
    private readonly IDirectoryManager manager;

    public YourClass(IDirectoryManager manager) {
        this.manager = manager;
    }

    public void MoveDirectories() {
        var dirList = manager.EnumerateDirectories(sourceDir, "*");

        string destinationDir + "//" + newDir;

        foreach (var d in dirList) {
            if (GetWeekOfYear(d.CreationTime) == weekNo) {
                if (!manager.Exists(destinationDir)) {
                    manager.Create(destinationDir);
                }

                if (!manager.Exists(destinationDir + "//" + d.Name)) {
                    Console.WriteLine("Move Folder  " + d.FullName + " TO " + destinationDir + "//" + d.Name);
                    manager.Move(d.FullName, destinationDir + "//" + d.Name);
                }
            }
        }
    }
}

Now you can mock the IDirectoryManager in your test case.

Hope this helps,
Fredrik