public void TryGetStream_WhenFileExists_ReturnsStreamAndTrue()
{
string path = SpecialPathPolicy.For<LazyFileInspectorTest>().CreateTempFileWithUniqueName().FullName;
File.WriteAllText(path, "Contents");
var fileInfo = new FileInfo(path);
using (var inspector = new LazyFileInspector(fileInfo))
{
Stream returnedStream;
Assert.IsTrue(inspector.TryGetStream(out returnedStream));
string contents = new StreamReader(returnedStream).ReadToEnd();
Assert.AreEqual("Contents", contents);
}
}
public void TryGetStream_WhenFileDoesNotExist_ReturnsNullAndFalse()
{
var fileInfo = new FileInfo(@"C:\This\File\Does\Not\Exist.xxx");
using (var inspector = new LazyFileInspector(fileInfo))
{
Stream returnedStream;
Assert.IsFalse(inspector.TryGetStream(out returnedStream));
Assert.IsNull(returnedStream);
}
}
public void TryGetStream_WhenPreviouslyReturnedStreamWasClosed_ReturnsNewStream()
{
string path = SpecialPathPolicy.For<LazyFileInspectorTest>().CreateTempFileWithUniqueName().FullName;
File.WriteAllText(path, "Contents");
var fileInfo = new FileInfo(path);
using (var inspector = new LazyFileInspector(fileInfo))
{
Stream returnedStream;
inspector.TryGetStream(out returnedStream);
returnedStream.Close();
Stream secondReturnedStream;
Assert.IsTrue(inspector.TryGetStream(out secondReturnedStream));
Assert.AreNotSame(returnedStream, secondReturnedStream, "Should have returned a new stream since the previous one was closed.");
}
}
public void Dispose_WhenStreamWasOpen_ShouldCloseTheStream()
{
string path = SpecialPathPolicy.For<LazyFileInspectorTest>().CreateTempFileWithUniqueName().FullName;
File.WriteAllText(path, "Contents");
var fileInfo = new FileInfo(path);
using (var inspector = new LazyFileInspector(fileInfo))
{
Stream returnedStream;
inspector.TryGetStream(out returnedStream);
inspector.Dispose();
Assert.DoesNotThrow(() => File.Delete(path), "Should be able to delete the file because the stream was closed.");
}
}
public void TryGetStream_WhenPreviouslyReturnedStreamStillOpen_ReturnsSameStreamAtPositionZero()
{
string path = SpecialPathPolicy.For<LazyFileInspectorTest>().CreateTempFileWithUniqueName().FullName;
File.WriteAllText(path, "Contents");
var fileInfo = new FileInfo(path);
using (var inspector = new LazyFileInspector(fileInfo))
{
Stream returnedStream;
inspector.TryGetStream(out returnedStream);
returnedStream.Position = 2;
Stream secondReturnedStream;
Assert.IsTrue(inspector.TryGetStream(out secondReturnedStream));
Assert.AreEqual(0, secondReturnedStream.Position, "Should have moved stream position back to 0.");
Assert.AreSame(returnedStream, secondReturnedStream, "Should have returned same stream since it was still open.");
}
}