public void WriteBytes_causes_stream_to_be_created_but_only_on_first_call()
{
var createCalls = 0;
var lazyStreamByteWriter = new LazyStreamByteWriter(delegate
{
++createCalls;
return null;
});
Assert.AreEqual(0, createCalls);
lazyStreamByteWriter.WriteBytes(new byte[] {1});
Assert.AreEqual(1, createCalls);
lazyStreamByteWriter.WriteBytes(new byte[] {1});
// Second call doesn't attempt to create stream
Assert.AreEqual(1, createCalls);
}
public void WriteBytes_does_not_create_stream_if_passed_null_bytes()
{
var createCalls = 0;
var lazyStreamByteWriter = new LazyStreamByteWriter(delegate
{
++createCalls;
return null;
});
Assert.AreEqual(0, createCalls);
lazyStreamByteWriter.WriteBytes(null);
Assert.AreEqual(0, createCalls);
}
public void WriteBytes_writes_then_flushes_stream()
{
var stream = Substitute.For<Stream>();
var lazyStreamByteWriter = new LazyStreamByteWriter(() => stream);
var bytes = new byte[] {1, 2, 3};
lazyStreamByteWriter.WriteBytes(bytes);
stream.Received(1).Write(bytes, 0, bytes.Length);
stream.Received(1).Flush();
}