CODEWITHSUNDEEP
c#.netvisual-studio-2010mstest
Sebastian Edelmeier
Sebastian Edelmeier

Reputation: 4157

Stuck in Limbo : Testing File-Related classes Hangs with IOException

I tend to get surprised these days, but this little bugger really owned me guerilla style:

Method under test : CopyAllFiles(sourceDir, targetDir) - Need not explain what it does, I guess.

In my test, I create both directories before calling the test subject. Furthermore I add three files to the directory created at the sourceDir location. Let the code speak:

FileSystemService serviceUnderTest = new FileSystemService(); 
string sourcePath= Path.Combine(_dateiPfad, "quelle");
string destinationPath= Path.Combine(_dateiPfad, "ziel");

Directory.CreateDirectory(sourcePath);
Directory.CreateDirectory(destinationPath);
File.Create(Path.Combine(sourcePath , "Foo.txt"));
File.Create(Path.Combine(sourcePath , "Bar.csv"));
File.Create(Path.Combine(sourcePath , "Baz.xls"));

serviceUnderTest.CopyAllFiles(sourcePath, destinationPath);
IEnumerable<string> sourceFiles= from fileName in Directory.GetFiles(sourcePath) select fileName;
IEnumerable<string> destinationFiles= from fileName in Directory.GetFiles(destinationPath) select fileName ;

Assert.IsTrue(sourceFiles.SequenceEqual(destinationFiles));

I get an IOException saying "File is being used by another process". Why can't I access Files I have just created?

Big thx in advance!

Upvotes: 0

Views: 154

Answers (1)

Leom Burke
Leom Burke

Reputation: 8271

File.Create() returns a FileStream of the file created. You need to close the stream before you can access the file in your CopyAllFiles() method:

FileStream foo = File.Create(Path.Combine(sourcePath, "Foo.txt"));
foo.Close();

You could also use WriteAllText to write out your test files:

File.WriteAllText(Path.Combine(sourcePath, "Foo.txt"),"FooTest");

Upvotes: 2

Related Questions