public async Task Timeout_throws_a_LibPlcTagException()
{
// Arrange
var nativeTag = new Mock <INativeTag>();
nativeTag // The initial creation of the tag object returns a status, so we return pending
.Setup(m => m.plc_tag_create(It.IsAny <string>(), 0))
.Returns((int)Status.Pending);
nativeTag // Subsequent calls to determine the tag status should still return pending
.Setup(m => m.plc_tag_status(It.IsAny <int>()))
.Returns((int)Status.Pending);
var tag = new NativeTagWrapper(nativeTag.Object)
{
Timeout = TimeSpan.FromMilliseconds(500)
};
// Act
// Assert
var ex = await Assert.ThrowsAsync <LibPlcTagException>(async() => {
await tag.InitializeAsync();
});
Assert.Equal(Status.ErrorTimeout.ToString(), ex.Message);
}
public async Task Timeout_returns_pending_but_eventually_ok()
{
// Arrange
var nativeTag = new Mock <INativeTag>();
nativeTag // The initial creation of the tag object returns a status, so we return pending
.Setup(m => m.plc_tag_create(It.IsAny <string>(), 0))
.Returns((int)Status.Pending);
nativeTag
.SetupSequence(m => m.plc_tag_status(It.IsAny <int>()))
.Returns((int)Status.Pending)
.Returns((int)Status.Pending)
.Returns((int)Status.Pending)
.Returns((int)Status.Pending)
.Returns((int)Status.Pending)
.Returns((int)Status.Pending)
.Returns((int)Status.Pending)
.Returns((int)Status.Ok);
var tag = new NativeTagWrapper(nativeTag.Object)
{
Timeout = TimeSpan.FromMilliseconds(500)
};
// Act
await tag.InitializeAsync();
// Assert
Assert.Equal(Status.Ok, tag.GetStatus());
}
public async Task Cancelled_cancellation_token_throws_a_TaskCanceledException()
{
// Arrange
var nativeTag = new Mock <INativeTag>();
nativeTag // The initial creation of the tag object returns a status, so we return pending
.Setup(m => m.plc_tag_create(It.IsAny <string>(), 0))
.Returns((int)Status.Pending);
nativeTag // Subsequent calls to determine the tag status should still return pending
.Setup(m => m.plc_tag_status(It.IsAny <int>()))
.Returns((int)Status.Pending);
var tag = new NativeTagWrapper(nativeTag.Object);
var cts = new CancellationTokenSource();
// Act
cts.CancelAfter(500);
// Assert
await Assert.ThrowsAsync <TaskCanceledException>(async() => {
await tag.InitializeAsync(cts.Token);
});
}
