public void Select_ExceptionThrownFromGetEnumeratorOnSource_ExceptionPropagatedToTheCaller()
{
IEnumerable <int> source = new ThrowsOnGetEnumerator();
Func <int, int> selector = i => i + 1;
var result = source.Select(selector);
var enumerator = result.GetEnumerator();
Assert.Throws <InvalidOperationException>(() => enumerator.MoveNext());
}
public void Select_ExceptionThrownFromGetEnumeratorOnSource_CurrentIsSetToDefaultOfItemTypeAndIteratorCanBeUsedAfterExceptionIsCaught()
{
IEnumerable<int> source = new ThrowsOnGetEnumerator();
Func<int, string> selector = i => i.ToString();
var result = source.Select(selector);
var enumerator = result.GetEnumerator();
Assert.Throws<InvalidOperationException>(() => enumerator.MoveNext());
string currentValue = enumerator.Current;
Assert.Equal(default(string), currentValue);
Assert.True(enumerator.MoveNext());
Assert.Equal("1", enumerator.Current);
}
public void Where_SourceThrowsOnGetEnumerator()
{
IEnumerable <int> source = new ThrowsOnGetEnumerator();
Func <int, bool> truePredicate = (value) => true;
var enumerator = source.Where(truePredicate).GetEnumerator();
// Ensure the first MoveNext call throws an exception
Assert.Throws <InvalidOperationException>(() => enumerator.MoveNext());
// Ensure Current is set to the default value of type T
int currentValue = enumerator.Current;
Assert.Equal(default(int), currentValue);
// Ensure subsequent MoveNext calls succeed
Assert.True(enumerator.MoveNext());
Assert.Equal(1, enumerator.Current);
}
public void Where_SourceThrowsOnGetEnumerator()
{
IEnumerable<int> source = new ThrowsOnGetEnumerator();
Func<int, bool> truePredicate = (value) => true;
var enumerator = source.Where(truePredicate).GetEnumerator();
// Ensure the first MoveNext call throws an exception
Assert.Throws<InvalidOperationException>(() => enumerator.MoveNext());
// Ensure Current is set to the default value of type T
int currentValue = enumerator.Current;
Assert.Equal(default(int), currentValue);
// Ensure subsequent MoveNext calls succeed
Assert.True(enumerator.MoveNext());
Assert.Equal(1, enumerator.Current);
}
public void Select_ExceptionThrownFromGetEnumeratorOnSource_CurrentIsSetToDefaultOfItemTypeAndIteratorCanBeUsedAfterExceptionIsCaught()
{
IEnumerable<int> source = new ThrowsOnGetEnumerator();
Func<int, string> selector = i => i.ToString();
var result = source.Select(selector);
var enumerator = result.GetEnumerator();
Assert.Throws<InvalidOperationException>(() => enumerator.MoveNext());
string currentValue = enumerator.Current;
Assert.Equal(default(string), currentValue);
Assert.True(enumerator.MoveNext());
Assert.Equal("1", enumerator.Current);
}
public void Select_ExceptionThrownFromGetEnumeratorOnSource_ExceptionPropagatedToTheCaller()
{
IEnumerable<int> source = new ThrowsOnGetEnumerator();
Func<int, int> selector = i => i + 1;
var result = source.Select(selector);
var enumerator = result.GetEnumerator();
Assert.Throws<InvalidOperationException>(() => enumerator.MoveNext());
}
