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// -----------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
// -----------------------------------------------------------------------
using System;
using System.Collections;
using System.Collections.Generic;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace Microsoft.Internal.Collections
{
public static class EnumerableExtensions
{
public static int Count(this IEnumerable source)
{
int count = 0;
foreach (object o in source)
{
count++;
}
return count;
}
public static IEnumerable<T> ToEnumerable<T>(this IEnumerable source)
{
foreach (object value in source)
{
yield return (T)value;
}
}
public static List<object> ToList(this IEnumerable source)
{
var enumerable = source.ToEnumerable<object>();
return System.Linq.Enumerable.ToList(enumerable);
}
public static T AssertSingle<T>(this IEnumerable<T> source)
{
return AssertSingle(source, t => true);
}
public static T AssertSingle<T>(this IEnumerable<T> source, string message)
{
return AssertSingle(source, t => true, message);
}
public static T AssertSingle<T>(this IEnumerable<T> source, Func<T, bool> predicate)
{
return AssertSingle(source, predicate, "Expecting a single item matching the predicate in the collection.");
}
public static T AssertSingle<T>(this IEnumerable<T> source, Func<T, bool> predicate, string message)
{
int count = 0;
T ret = default(T);
foreach (T t in source)
{
if (predicate(t))
{
count++;
ret = t;
}
}
Assert.AreEqual(1, count, message);
return ret;
}
}
}
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