public void MoveNextAsync_runs_initializer()
{
var mockShaper = Core.Objects.MockHelper.CreateShaperMock <int>();
mockShaper
.Setup(m => m.GetEnumerator())
.Returns(() => new DbEnumeratorShim <int>(Enumerable.Range(1, 1).GetEnumerator()));
var mockObjectResult =
new Mock <ObjectResult <int> >(mockShaper.Object, null, null)
{
CallBase = true
};
var initialized = false;
var enumerator = new LazyAsyncEnumerator <int>(
ct =>
{
initialized = true;
return(Task.FromResult(mockObjectResult.Object));
});
Assert.True(enumerator.MoveNextAsync(CancellationToken.None).Result);
Assert.True(initialized);
Assert.Equal(1, enumerator.Current);
}
public void MoveNextAsync_passes_users_cancellationToken()
{
var cancellationToken = new CancellationTokenSource().Token;
var mockAsyncEnumerator = new Mock <IDbAsyncEnumerator <int> >();
mockAsyncEnumerator
.Setup(e => e.MoveNextAsync(It.IsAny <CancellationToken>()))
.Returns(
(CancellationToken token) =>
{
Assert.Equal(cancellationToken, token);
return(Task.FromResult(false));
});
var lazyEnumerator =
new LazyAsyncEnumerator <int>(
token =>
{
Assert.Equal(cancellationToken, token);
return(Task.FromResult(mockAsyncEnumerator.Object));
});
lazyEnumerator
.MoveNextAsync(cancellationToken)
.GetAwaiter()
.GetResult();
}
public void Constructor_doesnt_run_initializer()
{
var initialized = false;
var _ = new LazyAsyncEnumerator <object>(
ct =>
{
initialized = true;
return(null);
});
Assert.False(initialized);
}
public void Current_runs_initializer()
{
var initialized = false;
var enumerator = new LazyAsyncEnumerator <object>(
ct =>
{
initialized = true;
return(Task.FromResult(new Mock <IDbAsyncEnumerator <object> >().Object));
});
var _ = enumerator.Current;
Assert.True(initialized);
}
public void MoveNextAsync_runs_initializer()
{
var initialized = false;
var enumerator = new LazyAsyncEnumerator <int>(
ct =>
{
initialized = true;
return(Task.FromResult(
(IDbAsyncEnumerator <int>) new DbEnumeratorShim <int>(
((IEnumerable <int>) new[] { 1 }).GetEnumerator())));
});
Assert.True(enumerator.MoveNextAsync(CancellationToken.None).Result);
Assert.True(initialized);
Assert.Equal(1, enumerator.Current);
}
public void MoveNextAsync_passes_users_cancellationToken()
{
var cancellationToken = new CancellationTokenSource().Token;
var mockEnumerator =
new Mock <DbEnumeratorShim <int> >(Enumerable.Empty <int>().GetEnumerator());
mockEnumerator
.As <IDbAsyncEnumerator <int> >()
.Setup(e => e.MoveNextAsync(It.IsAny <CancellationToken>()))
.Returns((CancellationToken token) => Task.FromResult(false));
var mockShaper = Core.Objects.MockHelper.CreateShaperMock <int>();
mockShaper
.Setup(m => m.GetEnumerator())
.Returns(() => mockEnumerator.Object);
var mockObjectResult =
new Mock <ObjectResult <int> >(mockShaper.Object, null, null)
{
CallBase = true
};
var lazyEnumerator =
new LazyAsyncEnumerator <int>(
token =>
{
Assert.Equal(cancellationToken, token);
return(Task.FromResult(mockObjectResult.Object));
});
Assert.False(
lazyEnumerator
.MoveNextAsync(cancellationToken)
.GetAwaiter()
.GetResult());
mockEnumerator
.As <IDbAsyncEnumerator <int> >()
.Verify(e => e.MoveNextAsync(cancellationToken), Times.Once());
}