public void ToDictionary()
{
Assert.Throws <ArgumentNullException>(() => ImmutableArrayExtensions.ToDictionary(manyElements, (Func <int, int>)null));
Assert.Throws <ArgumentNullException>(() => ImmutableArrayExtensions.ToDictionary(manyElements, (Func <int, int>)null, n => n));
Assert.Throws <ArgumentNullException>(() => ImmutableArrayExtensions.ToDictionary(manyElements, (Func <int, int>)null, n => n, EqualityComparer <int> .Default));
Assert.Throws <ArgumentNullException>(() => ImmutableArrayExtensions.ToDictionary(manyElements, n => n, (Func <int, string>)null));
Assert.Throws <ArgumentNullException>(() => ImmutableArrayExtensions.ToDictionary(manyElements, n => n, (Func <int, string>)null, EqualityComparer <int> .Default));
var stringToString = ImmutableArrayExtensions.ToDictionary(manyElements, n => n.ToString(), n => (n * 2).ToString());
Assert.Equal(stringToString.Count, manyElements.Length);
Assert.Equal("2", stringToString["1"]);
Assert.Equal("4", stringToString["2"]);
Assert.Equal("6", stringToString["3"]);
var stringToInt = ImmutableArrayExtensions.ToDictionary(manyElements, n => n.ToString());
Assert.Equal(stringToString.Count, manyElements.Length);
Assert.Equal(1, stringToInt["1"]);
Assert.Equal(2, stringToInt["2"]);
Assert.Equal(3, stringToInt["3"]);
Assert.Throws <NullReferenceException>(() => ImmutableArrayExtensions.ToDictionary(emptyDefault, n => n));
Assert.Throws <NullReferenceException>(() => ImmutableArrayExtensions.ToDictionary(emptyDefault, n => n, n => n));
Assert.Throws <NullReferenceException>(() => ImmutableArrayExtensions.ToDictionary(emptyDefault, n => n, EqualityComparer <int> .Default));
Assert.Throws <NullReferenceException>(() => ImmutableArrayExtensions.ToDictionary(emptyDefault, n => n, n => n, EqualityComparer <int> .Default));
}
