Is

using System;
using System.Collections.Generic;
using System.Linq;

namespace Microsoft.VisualStudio.TestTools.UnitTesting
{
 public static class Test
 {
 /// <summary>IsNull</summary>
 public static void Is<T>(this T value)
 {
 Assert.IsNull(value);
 }

 public static void Is<T>(this T actual, T expected, string message = "")
 {
 Assert.AreEqual(expected, actual, message);
 }

 public static void Is<T>(this T actual, Func<T, bool> expected, string message = "")
 {
 Assert.IsTrue(expected(actual), message);
 }

 public static void Is<T>(this IEnumerable<T> actual, IEnumerable<T> expected, string message = "")
 {
 CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray(), message);
 }

 public static void Is<T>(this IEnumerable<T> actual, params T[] expected)
 {
 Is(actual, expected.AsEnumerable());
 }

 public static void Is<T>(this IEnumerable<T> actual, IEnumerable<Func<T, bool>> expected)
 {
 var count = 0;
 foreach (var cond in actual.Zip(expected, (v, pred) => pred(v)))
 {
 Assert.IsTrue(cond, "Index = " + count++);
 }
 }

 public static void Is<T>(this IEnumerable<T> actual, params Func<T, bool>[] expected)
 {
 Is(actual, expected.AsEnumerable());
 }
 }
}

[TestMethod]
public void Test()
{
 // actual.Is(expected)
 "foo".Is("bar");
 // actual.Is(x => bool(expected cond))
 "foobar".Is(s => s.StartsWith("f") && s.EndsWith("r"));
 // IEnumerable<T>.Is(params expected) (CollectionAssert)
 Enumerable.Range(1, 5).Is(1, 2, 3, 4, 5);
}