/mcs/class/System.Core/Test/System.Linq/EnumerableTest.cs
C# | 523 lines | 388 code | 108 blank | 27 comment | 12 complexity | f50ee77f2bed1706ff95b4fe86af742b MD5 | raw file
Possible License(s): LGPL-2.0, MPL-2.0-no-copyleft-exception, CC-BY-SA-3.0, GPL-2.0, LGPL-2.1
- //
- // EnumerableTest.cs
- //
- // Author:
- // Jb Evain (jbevain@novell.com)
- //
- // (C) 2007 Novell, Inc. (http://www.novell.com)
- //
- // Permission is hereby granted, free of charge, to any person obtaining
- // a copy of this software and associated documentation files (the
- // "Software"), to deal in the Software without restriction, including
- // without limitation the rights to use, copy, modify, merge, publish,
- // distribute, sublicense, and/or sell copies of the Software, and to
- // permit persons to whom the Software is furnished to do so, subject to
- // the following conditions:
- //
- // The above copyright notice and this permission notice shall be
- // included in all copies or substantial portions of the Software.
- //
- // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- //
- using System;
- using System.IO;
- using System.Collections;
- using System.Collections.Generic;
- using System.Linq;
- using System.Linq.Expressions;
- using NUnit.Framework;
- namespace MonoTests.System.Linq {
- [TestFixture]
- public class EnumerableTest {
- [Test]
- public void TestSimpleExcept ()
- {
- int [] first = {0, 1, 2, 3, 4, 5};
- int [] second = {2, 4, 6};
- int [] result = {0, 1, 3, 5};
- AssertAreSame (result, first.Except (second));
- }
- [Test]
- public void TestSimpleIntersect ()
- {
- int [] first = {0, 1, 2, 3, 4, 5};
- int [] second = {2, 4, 6};
- int [] result = {2, 4};
- AssertAreSame (result, first.Intersect (second));
- }
- [Test]
- public void TestSimpleUnion ()
- {
- int [] first = {0, 1, 2, 3, 4, 5};
- int [] second = {2, 4, 6};
- int [] result = {0, 1, 2, 3, 4, 5, 6};
- AssertAreSame (result, first.Union (second));
- }
- class Foo {}
- class Bar : Foo {}
- [Test]
- public void TestCast ()
- {
- Bar a = new Bar ();
- Bar b = new Bar ();
- Bar c = new Bar ();
- Foo [] foos = new Foo [] {a, b, c};
- Bar [] result = new Bar [] {a, b, c};
- AssertAreSame (result, foos.Cast<Bar> ());
- }
- class Bingo : IEnumerable<int>, IEnumerable<string> {
- IEnumerator<int> IEnumerable<int>.GetEnumerator ()
- {
- yield return 42;
- yield return 12;
- }
- IEnumerator<string> IEnumerable<string>.GetEnumerator ()
- {
- yield return "foo";
- yield return "bar";
- }
- public IEnumerator GetEnumerator ()
- {
- return (this as IEnumerable<int>).GetEnumerator ();
- }
- }
- [Test]
- public void TestCastToImplementedType ()
- {
- var ints = new int [] { 42, 12 };
- var strs = new string [] { "foo", "bar" };
- var bingo = new Bingo ();
- AssertAreSame (ints, bingo.Cast<int> ());
- AssertAreSame (strs, bingo.Cast<string> ());
- }
- [Test]
- public void TestLast ()
- {
- int [] data = {1, 2, 3};
- Assert.AreEqual (3, data.Last ());
- }
- [Test]
- public void TestLastOrDefault ()
- {
- int [] data = {};
- Assert.AreEqual (default (int), data.LastOrDefault ());
- }
- [Test]
- public void TestFirst ()
- {
- int [] data = {1, 2, 3};
- Assert.AreEqual (1, data.First ());
- }
- [Test]
- public void TestFirstOrDefault ()
- {
- int [] data = {};
- Assert.AreEqual (default (int), data.FirstOrDefault ());
- }
- [Test]
- public void TestSequenceEqual ()
- {
- int [] first = {0, 1, 2, 3, 4, 5};
- int [] second = {0, 1, 2};
- int [] third = {0, 1, 2, 3, 4, 5};
- Assert.IsFalse (first.SequenceEqual (second));
- Assert.IsTrue (first.SequenceEqual (third));
- }
- [Test]
- public void TestSkip ()
- {
- int [] data = {0, 1, 2, 3, 4, 5};
- int [] result = {3, 4, 5};
- AssertAreSame (result, data.Skip (3));
- }
- [Test]
- public void TestSkipWhile ()
- {
- int [] data = {0, 1, 2, 3, 4, 5};
- int [] result = {3, 4, 5};
- AssertAreSame (result, data.SkipWhile (i => i < 3));
- }
- [Test]
- public void TestTake ()
- {
- int [] data = {0, 1, 2, 3, 4, 5};
- int [] result = {0, 1, 2};
- AssertAreSame (result, data.Take (3));
- }
- [Test]
- public void TestTakeWhile ()
- {
- int [] data = {0, 1, 2, 3, 4, 5};
- int [] result = {0, 1, 2};
- AssertAreSame (result, data.TakeWhile (i => i < 3));
- }
- [Test]
- public void TestSelect ()
- {
- int [] data = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
- int [] result = {1, 3, 5, 7, 9};
- AssertAreSame (result, data.Where (i => i % 2 != 0));
- }
- [Test]
- public void TestReverse ()
- {
- int [] data = {0, 1, 2, 3, 4};
- int [] result = {4, 3, 2, 1, 0};
- AssertAreSame (result, data.Reverse ());
- AssertAreSame (result, Enumerable.Range (0, 5).Reverse ());
- }
- [Test]
- public void TestSum ()
- {
- int [] data = {1, 2, 3, 4};
- Assert.AreEqual (10, data.Sum ());
- }
- [Test]
- public void SumOnEmpty ()
- {
- int [] data = {};
- Assert.AreEqual (0, data.Sum ());
- }
- [Test]
- public void TestMax ()
- {
- int [] data = {1, 3, 5, 2};
- Assert.AreEqual (5, data.Max ());
- }
- [Test]
- public void TestMaxNullableInt32 ()
- {
- int? [] data = { null, null, null };
- Assert.IsNull (data.Max (x => -x));
- data = new int? [] { null, 1, 2 };
- Assert.AreEqual (-1, data.Max (x => -x));
- }
- [Test]
- public void TestMin ()
- {
- int [] data = {3, 5, 2, 6, 1, 7};
- Assert.AreEqual (1, data.Min ());
- }
- [Test]
- public void TestMinNullableInt32 ()
- {
- int? [] data = { null, null, null };
- Assert.IsNull (data.Min(x => -x));
- data = new int? [] { null, 1, 2 };
- Assert.AreEqual (-2, data.Min (x => -x));
- }
- [Test]
- public void TestMinStringEmpty ()
- {
- Assert.IsNull ((new string [0]).Min ());
- }
- [Test]
- public void TestMaxStringEmpty ()
- {
- Assert.IsNull ((new string [0]).Max ());
- }
- [Test]
- public void TestToList ()
- {
- int [] data = {3, 5, 2};
- var list = data.ToList ();
- AssertAreSame (data, list);
- Assert.AreEqual (typeof (List<int>), list.GetType ());
- }
- [Test]
- public void TestToArray ()
- {
- ICollection<int> coll = new List<int> ();
- coll.Add (0);
- coll.Add (1);
- coll.Add (2);
- int [] result = {0, 1, 2};
- var array = coll.ToArray ();
- AssertAreSame (result, array);
- Assert.AreEqual (typeof (int []), array.GetType ());
- }
- [Test]
- public void TestIntersect ()
- {
- int [] left = { 1, 1 }, right = { 1, 1 };
- int [] result = { 1 };
- AssertAreSame (result, left.Intersect (right));
- }
- [Test]
- public void TestAverageOnInt32 ()
- {
- Assert.AreEqual (23.25, (new int [] { 24, 7, 28, 34 }).Average ());
- }
- [Test]
- public void TestAverageOnInt64 ()
- {
- Assert.AreEqual (23.25, (new long [] { 24, 7, 28, 34 }).Average ());
- }
- [Test]
- public void TestAverageOnLongNullable ()
- {
- List<long?> list = new List<long?> ();
- list.Add (2);
- list.Add (3);
- Assert.AreEqual (2.5d, list.Average ());
- }
- [Test]
- public void TestRange ()
- {
- AssertAreSame (new [] {1, 2, 3, 4}, Enumerable.Range (1, 4));
- AssertAreSame (new [] {0, 1, 2, 3}, Enumerable.Range (0, 4));
- }
- [Test]
- public void TestTakeTakesProperNumberOfItems ()
- {
- var stream = new MemoryStream (new byte [] { 1, 2, 3, 4, 0 });
- Assert.AreEqual (0, stream.Position);
- foreach (byte b in AsEnumerable (stream).Take (2))
- ;
- Assert.AreEqual (2, stream.Position);
- }
- static IEnumerable<byte> AsEnumerable (Stream stream)
- {
- byte b;
- while ((b = (byte) stream.ReadByte ()) >= 0)
- yield return b;
- }
- [Test]
- public void TestOrderBy ()
- {
- int [] array = { 14, 53, 3, 9, 11, 14, 5, 32, 2 };
- var q = from i in array
- orderby i
- select i;
- AssertIsOrdered (q);
- }
- class Baz {
- string name;
- int age;
- public string Name
- {
- get {
- if (string.IsNullOrEmpty (name))
- return Age.ToString ();
- return name + " (" + Age + ")";
- }
- }
- public int Age
- {
- get { return age + 1; }
- }
- public Baz (string name, int age)
- {
- this.name = name;
- this.age = age;
- }
- public override int GetHashCode ()
- {
- return this.Age ^ this.Name.GetHashCode ();
- }
- public override bool Equals (object obj)
- {
- Baz b = obj as Baz;
- if (b == null)
- return false;
- return b.Age == this.Age && b.Name == this.Name;
- }
- public override string ToString ()
- {
- return this.Name;
- }
- }
- static IEnumerable<Baz> CreateBazCollection ()
- {
- return new [] {
- new Baz ("jb", 25),
- new Baz ("ana", 20),
- new Baz ("reg", 28),
- new Baz ("ro", 25),
- new Baz ("jb", 7),
- };
- }
- [Test]
- public void TestOrderByAgeAscendingTheByNameDescending ()
- {
- var q = from b in CreateBazCollection ()
- orderby b.Age ascending, b.Name descending
- select b;
- var expected = new [] {
- new Baz ("jb", 7),
- new Baz ("ana", 20),
- new Baz ("ro", 25),
- new Baz ("jb", 25),
- new Baz ("reg", 28),
- };
- AssertAreSame (expected, q);
- }
- class Data {
- public int ID { get; set; }
- public string Name { get; set; }
- public override string ToString ()
- {
- return ID + " " + Name;
- }
- }
- IEnumerable<Data> CreateData ()
- {
- return new [] {
- new Data { ID = 10, Name = "bcd" },
- new Data { ID = 20, Name = "Abcd" },
- new Data { ID = 20, Name = "Ab" },
- new Data { ID = 10, Name = "Zyx" },
- };
- }
- [Test]
- public void TestOrderByIdDescendingThenByNameAscending ()
- {
- var q = from d in CreateData ()
- orderby d.ID descending, d.Name ascending
- select d;
- var list = new List<Data> (q);
- Assert.AreEqual ("Ab", list [0].Name);
- Assert.AreEqual ("Abcd", list [1].Name);
- Assert.AreEqual ("bcd", list [2].Name);
- Assert.AreEqual ("Zyx", list [3].Name);
- }
- static void AssertIsOrdered (IEnumerable<int> e)
- {
- int f = int.MinValue;
- foreach(int i in e) {
- Assert.IsTrue (f <= i);
- f = i;
- }
- }
- static void AssertAreSame<T> (IEnumerable<T> expected, IEnumerable<T> actual)
- {
- if (expected == null) {
- Assert.IsNull (actual);
- return;
- }
- Assert.IsNotNull (actual);
- IEnumerator<T> ee = expected.GetEnumerator ();
- IEnumerator<T> ea = actual.GetEnumerator ();
- while (ee.MoveNext ()) {
- Assert.IsTrue (ea.MoveNext (), "'" + ee.Current + "' expected.");
- Assert.AreEqual (ee.Current, ea.Current);
- }
- if (ea.MoveNext ())
- Assert.Fail ("Unexpected element: " + ea.Current);
- }
- }
- }