public void StopListening_WhenListenerDidNotExist_WillNotError()
{
// Arrange
var node = new ObservableNode(Guid.NewGuid());
System.Action listener = new System.Action(() => { });
// Act
// Assert
node.StopListening(listener);
}
public void SetValue_GivenNewType_WillNotError()
{
// Arrange
var node = new ObservableNode(Guid.NewGuid());
node.SetValue((int)5);
// Act
node.SetValue(new Dictionary<string, bool>());
// Assert
// Act will throw an exception itself if there is an error.
}
public void GetValue_GivenTNotOfValue_ThrowsInvalidCastException()
{
// Arrange
var node = new ObservableNode(Guid.NewGuid());
node.SetValue((int)5);
// Act
Assert.Throws<System.InvalidCastException>(
() => { node.GetValue<bool>(); },
// Assert
"Value was set with an Integer, yet did not error when trying to extract a boolean.");
}
public void GetValue_GivenTOfValue_ReturnsValue()
{
// Arrange
var node = new ObservableNode(Guid.NewGuid());
int expected = 5;
node.SetValue(expected);
// Act
var actual = node.GetValue<int>();
// Assert
Assert.AreEqual(
expected,
actual,
"GetValue<int> did not return value, even though the value was set to an int of " + expected);
}
public void StartListening_WhenValueChanges_WillTriggerListener()
{
// Arrange
var node = new ObservableNode(Guid.NewGuid());
var hasListenerTriggered = false;
System.Action listener = new System.Action(() =>
{
hasListenerTriggered = true;
});
// Act
node.StartListening(listener);
node.SetValue((int)5);
// Assert
Assert.IsTrue(
hasListenerTriggered,
"The trigger should have fired when we changed the data value, but it has not.");
}
public void StartListening_WhenSetWithSameValue_WillNotTriggerListener()
{
// Arrange
var node = new ObservableNode(Guid.NewGuid());
var hasListenerTriggered = false;
System.Action listener = new System.Action(() =>
{
hasListenerTriggered = true;
});
// Act
node.SetValue((int)5);
node.StartListening(listener);
node.SetValue((int)5);
// Assert
Assert.IsFalse(
hasListenerTriggered,
"The trigger should not have fired because the new value was the same");
}
public void StopListening_WhenListenerExisted_WillStopListenerBeingCalledWhenValueChanges()
{
// Arrange
var node = new ObservableNode(Guid.NewGuid());
var hasListenerTriggered = false;
System.Action listener = new System.Action(() =>
{
hasListenerTriggered = true;
});
// Act
node.SetValue((int)0);
node.StartListening(listener);
node.StopListening(listener);
node.SetValue((int)1);
// Assert
Assert.IsFalse(
hasListenerTriggered,
"The trigger should not have fired when the data type changed because StopListener was called.");
}
