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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace Tests
{
public partial class Tests
{
[TestMethod]
public void While_Arguments()
{
AssertThrows<ArgumentNullException>(() => EnumerableEx.While<int>(null, new[] { 1 }));
AssertThrows<ArgumentNullException>(() => EnumerableEx.While<int>(() => true, null));
}
[TestMethod]
public void While1()
{
var x = 5;
var res = EnumerableEx.While(() => x > 0, EnumerableEx.Defer(() => new[] { x }).Do(_ => x--)).ToList();
Assert.IsTrue(Enumerable.SequenceEqual(res, new[] { 5, 4, 3, 2, 1 }));
}
[TestMethod]
public void While2()
{
var x = 0;
var res = EnumerableEx.While(() => x > 0, EnumerableEx.Defer(() => new[] { x }).Do(_ => x--)).ToList();
Assert.IsTrue(Enumerable.SequenceEqual(res, new int[0]));
}
[TestMethod]
public void DoWhile_Arguments()
{
AssertThrows<ArgumentNullException>(() => EnumerableEx.DoWhile<int>(new[] { 1 }, null));
AssertThrows<ArgumentNullException>(() => EnumerableEx.DoWhile<int>(null, () => true));
}
[TestMethod]
public void DoWhile1()
{
var x = 5;
var res = EnumerableEx.DoWhile(EnumerableEx.Defer(() => new[] { x }).Do(_ => x--), () => x > 0).ToList();
Assert.IsTrue(Enumerable.SequenceEqual(res, new[] { 5, 4, 3, 2, 1 }));
}
[TestMethod]
public void DoWhile2()
{
var x = 0;
var res = EnumerableEx.DoWhile(EnumerableEx.Defer(() => new[] { x }).Do(_ => x--), () => x > 0).ToList();
Assert.IsTrue(Enumerable.SequenceEqual(res, new[] { 0 }));
}
[TestMethod]
public void If_Arguments()
{
AssertThrows<ArgumentNullException>(() => EnumerableEx.If<int>(null, new[] { 1 }));
AssertThrows<ArgumentNullException>(() => EnumerableEx.If<int>(() => true, null));
AssertThrows<ArgumentNullException>(() => EnumerableEx.If<int>(null, new[] { 1 }, new[] { 1 }));
AssertThrows<ArgumentNullException>(() => EnumerableEx.If<int>(() => true, null, new[] { 1 }));
AssertThrows<ArgumentNullException>(() => EnumerableEx.If<int>(() => true, new[] { 1 }, null));
}
[TestMethod]
public void If1()
{
var x = 5;
var res = EnumerableEx.If(() => x > 0, new[] { +1 }, new[] { -1 });
Assert.AreEqual(+1, res.Single());
x = -x;
Assert.AreEqual(-1, res.Single());
}
[TestMethod]
public void If2()
{
var x = 5;
var res = EnumerableEx.If(() => x > 0, new[] { +1 });
Assert.AreEqual(+1, res.Single());
x = -x;
Assert.IsTrue(res.IsEmpty());
}
[TestMethod]
public void Case_Arguments()
{
AssertThrows<ArgumentNullException>(() => EnumerableEx.Case<int, int>(null, new Dictionary<int, IEnumerable<int>>()));
AssertThrows<ArgumentNullException>(() => EnumerableEx.Case<int, int>(() => 1, null));
AssertThrows<ArgumentNullException>(() => EnumerableEx.Case<int, int>(null, new Dictionary<int, IEnumerable<int>>(), new[] { 1 }));
AssertThrows<ArgumentNullException>(() => EnumerableEx.Case<int, int>(() => 1, null, new[] { 1 }));
AssertThrows<ArgumentNullException>(() => EnumerableEx.Case<int, int>(() => 1, new Dictionary<int, IEnumerable<int>>(), null));
}
[TestMethod]
public void Case1()
{
var x = 1;
var d = 'd';
var res = EnumerableEx.Case<int, char>(() => x, new Dictionary<int, IEnumerable<char>>
{
{ 0, new[] { 'a' } },
{ 1, new[] { 'b' } },
{ 2, new[] { 'c' } },
{ 3, EnumerableEx.Defer(() => new[] { d }) },
});
Assert.AreEqual('b', res.Single());
Assert.AreEqual('b', res.Single());
x = 0;
Assert.AreEqual('a', res.Single());
x = 2;
Assert.AreEqual('c', res.Single());
x = 3;
Assert.AreEqual('d', res.Single());
d = 'e';
Assert.AreEqual('e', res.Single());
x = 4;
Assert.IsTrue(res.IsEmpty());
}
[TestMethod]
public void Case2()
{
var x = 1;
var d = 'd';
var res = EnumerableEx.Case<int, char>(() => x, new Dictionary<int, IEnumerable<char>>
{
{ 0, new[] { 'a' } },
{ 1, new[] { 'b' } },
{ 2, new[] { 'c' } },
{ 3, EnumerableEx.Defer(() => new[] { d }) },
}, new[] { 'z' });
Assert.AreEqual('b', res.Single());
Assert.AreEqual('b', res.Single());
x = 0;
Assert.AreEqual('a', res.Single());
x = 2;
Assert.AreEqual('c', res.Single());
x = 3;
Assert.AreEqual('d', res.Single());
d = 'e';
Assert.AreEqual('e', res.Single());
x = 4;
Assert.AreEqual('z', res.Single());
}
[TestMethod]
public void For_Arguments()
{
AssertThrows<ArgumentNullException>(() => EnumerableEx.For<int, int>(null, x => new[] { 1 }));
AssertThrows<ArgumentNullException>(() => EnumerableEx.For<int, int>(new[] { 1 }, null));
}
[TestMethod]
public void For()
{
var res = EnumerableEx.For(new[] { 1, 2, 3 }, x => Enumerable.Range(0, x)).ToList();
Assert.IsTrue(res.SequenceEqual(new[] { 0, 0, 1, 0, 1, 2 }));
}
}
}
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