NUnit: Test for file system

[Luigi]

Hi all,
with NUnit (C#) which is the better way to implement some tests to operate
on a file in the file system?
For instance: file exists, file read and file write.

Thanks in advance.

 

[Nicholas Paldino [.NET/C# MVP]]

Luigi,

Why not just use the classes in the System.IO namespace to determine if
the file exists, and to read/write from/to the file?

 

[Peter Morris]

Use dependency injection or the service pattern to obtain a reference to an
interface that provides these functions, and use mocks to mock them during
testing.



Pete

 

[sloan]

I'm confused about what you're asking.


bool b = System.IO.File.Exists(@"C:\myfile.txt");
Assert.AreEqual(true,b);


That looks like the basic setup to me.

 

[Luigi]

Yes, something similar.
Not also verify that the file exists, but also that I can read it.
A full tests for file system access and reading.

Luigi

 

[raulavi]

i od have something like this

public static bool IsFileWritable(string fileName)
{
//write at least one single line into file,
//used by unit test
try
{
//to clear file use
// FileInfo afileinfo = new FileInfo("list.txt");
afileinfo.Delete();
string line = String.Empty;
StreamWriter oSWriter = new StreamWriter(fileName);
oSWriter.WriteLine("TEST:" +
DateTime.Today.ToString("yyMMdd"));
oSWriter.Close();

//Chk segments in created file
StreamReader aSR = new StreamReader(fileName);

line = aSR.ReadLine();
if (line == null) return false;
if (!line.StartsWith("TEST:")) return false;

aSR.Close();
oSWriter.Dispose(); //remove from memory,does not delete file
return true;
}
catch (Exception)
{
return false;
}
}