public void IDictionary_GetEnumerator()
{
IDictionary map = new MapField <string, string> {
{ "x", "y" }
};
var enumerator = map.GetEnumerator();
// Commented assertions show an ideal situation - it looks like
// the LinkedList enumerator doesn't throw when you ask for the current entry
// at an inappropriate time; fixing this would be more work than it's worth.
// Assert.Throws<InvalidOperationException>(() => enumerator.Current.GetHashCode());
Assert.IsTrue(enumerator.MoveNext());
Assert.AreEqual("x", enumerator.Key);
Assert.AreEqual("y", enumerator.Value);
Assert.AreEqual(new DictionaryEntry("x", "y"), enumerator.Current);
Assert.AreEqual(new DictionaryEntry("x", "y"), enumerator.Entry);
Assert.IsFalse(enumerator.MoveNext());
// Assert.Throws<InvalidOperationException>(() => enumerator.Current.GetHashCode());
enumerator.Reset();
// Assert.Throws<InvalidOperationException>(() => enumerator.Current.GetHashCode());
Assert.IsTrue(enumerator.MoveNext());
Assert.AreEqual("x", enumerator.Key); // Assume the rest are okay
}