public void RefreshesAfterMoveNextReturnsFalse()
{
var refreshCount = 0;
var list = new List <int?> {
1, 2
};
var refresher = new RefreshEnumerator <int?>(() =>
{
refreshCount++;
return(list.GetEnumerator());
});
Assert.IsTrue(refresher.MoveNext());
Assert.AreEqual(1, refreshCount);
Assert.AreEqual(1, refresher.Current);
Assert.IsTrue(refresher.MoveNext());
Assert.AreEqual(1, refreshCount);
Assert.AreEqual(2, refresher.Current);
Assert.IsTrue(refresher.MoveNext());
Assert.AreEqual(1, refreshCount);
Assert.AreEqual(default(int?), refresher.Current);
Assert.IsTrue(refresher.MoveNext());
Assert.AreEqual(2, refreshCount);
Assert.AreEqual(1, refresher.Current);
Assert.IsTrue(refresher.MoveNext());
Assert.AreEqual(2, refreshCount);
Assert.AreEqual(2, refresher.Current);
}
public void CurrentIsDefault_T_WhenUnderlyingEnumeratorReturnsFalse()
{
var refresher = new RefreshEnumerator <int?>(() => new List <int?>().GetEnumerator());
refresher.MoveNext();
Assert.AreEqual(default(int?), refresher.Current);
}
public void MoveNextReturnsTrueWhenUnderlyingEnumeratorReturnsFalse()
{
var refresher = new RefreshEnumerator <int?>(() => new List <int?>().GetEnumerator());
Assert.IsTrue(refresher.MoveNext());
refresher.Dispose();
}
public void RefreshesEnumeratorOnFirstMoveNext()
{
var refreshed = false;
var refresher = new RefreshEnumerator <int?>(() =>
{
refreshed = true;
return(new List <int?>().GetEnumerator());
});
refresher.MoveNext();
Assert.IsTrue(refreshed);
}
public void UnderlyingEnumeratorDisposed_WhenUnderlyingEnumeratorReturnsFalse()
{
var fakeEnumerator = new Mock <IEnumerator <int?> >();
fakeEnumerator.Setup(e => e.MoveNext()).Returns(false);
fakeEnumerator.Setup(e => e.Dispose()).Verifiable();
var refresher = new RefreshEnumerator <int?>(() => fakeEnumerator.Object);
refresher.MoveNext();
fakeEnumerator.Verify(enumerator => enumerator.Dispose(), Times.Once);
}
public void ResetCallsUnderlyingReset()
{
var fakeEnumerator = new Mock <IEnumerator <int?> >();
fakeEnumerator.Setup(e => e.MoveNext()).Returns(true);
fakeEnumerator.Setup(e => e.Reset()).Verifiable();
var refresher = new RefreshEnumerator <int?>(() => fakeEnumerator.Object);
refresher.MoveNext();
refresher.Reset();
fakeEnumerator.Verify(enumerator => enumerator.Reset(), Times.Once);
}