public void GenericEnumerator_ThrowsInvalidOperationExceptionIfSourceIsChanged()
{
var collection = new[] { 5, 7, 9, 11, 13 };
var version = 0;
var enumerator = new GenericEnumerator<Int32>(collection,
(Object state, Int32 ix, out Int32 result) =>
{
var l = (Int32[])state;
if (ix < 0 || ix >= l.Length)
{
result = 0;
return false;
}
result = l[ix];
return true;
},
(Object state) =>
{
return version;
});
enumerator.MoveNext();
version++;
collection[0] = 5;
Assert.That(() => enumerator.MoveNext(),
Throws.TypeOf<InvalidOperationException>());
}
public void GenericEnumerator_ThrowsInvalidOperationExceptionIfSourceIsChanged()
{
var collection = new[] { 5, 7, 9, 11, 13 };
var version = 0;
var enumerator = new GenericEnumerator <Int32>(collection,
(Object state, Int32 ix, out Int32 result) =>
{
var l = (Int32[])state;
if (ix < 0 || ix >= l.Length)
{
result = 0;
return(false);
}
result = l[ix];
return(true);
},
(Object state) =>
{
return(version);
});
enumerator.MoveNext();
version++;
collection[0] = 5;
Assert.That(() => enumerator.MoveNext(),
Throws.TypeOf <InvalidOperationException>());
}
public void GenericEnumerator_EnumeratesCorrectly()
{
var collection = new[] { 5, 7, 9, 11, 13 };
var enumerator = new GenericEnumerator<Int32>(collection,
(Object state, Int32 ix, out Int32 result) =>
{
var l = (Int32[])state;
if (ix < 0 || ix >= l.Length)
{
result = 0;
return false;
}
result = l[ix];
return true;
});
TheResultingValue(enumerator.MoveNext()).ShouldBe(true);
TheResultingValue(enumerator.Current).ShouldBe(5);
TheResultingValue(enumerator.MoveNext()).ShouldBe(true);
TheResultingValue(enumerator.Current).ShouldBe(7);
TheResultingValue(enumerator.MoveNext()).ShouldBe(true);
TheResultingValue(enumerator.Current).ShouldBe(9);
TheResultingValue(enumerator.MoveNext()).ShouldBe(true);
TheResultingValue(enumerator.Current).ShouldBe(11);
TheResultingValue(enumerator.MoveNext()).ShouldBe(true);
TheResultingValue(enumerator.Current).ShouldBe(13);
TheResultingValue(enumerator.MoveNext()).ShouldBe(false);
}
public void GenericEnumerator_EnumeratesCorrectly()
{
var collection = new[] { 5, 7, 9, 11, 13 };
var enumerator = new GenericEnumerator <Int32>(collection,
(Object state, Int32 ix, out Int32 result) =>
{
var l = (Int32[])state;
if (ix < 0 || ix >= l.Length)
{
result = 0;
return(false);
}
result = l[ix];
return(true);
});
TheResultingValue(enumerator.MoveNext()).ShouldBe(true);
TheResultingValue(enumerator.Current).ShouldBe(5);
TheResultingValue(enumerator.MoveNext()).ShouldBe(true);
TheResultingValue(enumerator.Current).ShouldBe(7);
TheResultingValue(enumerator.MoveNext()).ShouldBe(true);
TheResultingValue(enumerator.Current).ShouldBe(9);
TheResultingValue(enumerator.MoveNext()).ShouldBe(true);
TheResultingValue(enumerator.Current).ShouldBe(11);
TheResultingValue(enumerator.MoveNext()).ShouldBe(true);
TheResultingValue(enumerator.Current).ShouldBe(13);
TheResultingValue(enumerator.MoveNext()).ShouldBe(false);
}