public void TestNotDisposedReader()
{
var file = new FileInfo(Path.Combine(TestContext.CurrentContext.TestDirectory, @"Disposing\Resources\TextFile2.txt"));
var badConsumer = new BadStreamConsumer();
//so, it works first time it's used
Assert.IsNotNull(badConsumer.GetFirstLine(file));
//but then on a second access to that file it fails
Assert.That(() => badConsumer.GetFirstLine(file),
Throws.Exception.TypeOf(typeof(IOException))
.With.Message.Contain("The process cannot access the file")
.And.With.Message.Contain(" because it is being used by another process"));
//even if you create a new instance of the consumer (duh!)
Assert.That(() => new BadStreamConsumer().GetFirstLine(file),
Throws.Exception.TypeOf(typeof(IOException))
.With.Message.Contain("The process cannot access the file")
.And.With.Message.Contain(" because it is being used by another process"));
//and even if you use the proper consumer (duh x2!)
Assert.That(() => new GoodStreamConsumer().GetFirstLine(file),
Throws.Exception.TypeOf(typeof(IOException))
.With.Message.Contain("The process cannot access the file")
.And.With.Message.Contain(" because it is being used by another process"));
}
public SomeWrapperClass()
{
//this class simply locks a file in a non-obvious and incorrect way
var file = new FileInfo(Path.Combine(TestContext.CurrentContext.TestDirectory, @"Disposing\Resources\TextFile3.txt"));
var badConsumer = new BadStreamConsumer();
Assert.IsNotNull(badConsumer.GetFirstLine(file));
}