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//
// CoreExtensionsTests.cs
//
// Author:
// Marius Ungureanu <marius.ungureanu@xamarin.com>
//
// Copyright (c) 2016 Xamarin, Inc (http://www.xamarin.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.Linq;
using NUnit.Framework;
namespace MonoDevelop.Core
{
[TestFixture]
public class CoreExtensionsTests
{
[SetUp]
public void SetUp ()
{
memoTest1CallCount = 0;
memoTest2CallCount = 0;
}
[Test]
public void ConcatWorks ()
{
string toAdd = "Test String";
var initial = Enumerable.Repeat (toAdd, 4);
var expected = Enumerable.Repeat (toAdd, 5);
Assert.That (expected, Is.EquivalentTo (initial.Concat (toAdd)));
}
[TestCase ("item1", "item2", "item1", 0)]
[TestCase ("item1", "item2", "item2", 1)]
[TestCase ("item1", "item2", "item3", -1)]
public void IndexOfWorks (string toAdd1, string toAdd2, string toFind, int expectedIndex)
{
var toSearch = Enumerable.Empty<string> ().Concat (toAdd1).Concat (toAdd2);
Assert.AreEqual (expectedIndex, toSearch.IndexOf (toFind));
}
[TestCase ("item1", "item2", "item1", 0)]
[TestCase ("item1", "item2", "item2", 1)]
[TestCase ("item1", "item2", "item3", -1)]
public void FindIndexWorks (string toAdd1, string toAdd2, string toFind, int expectedIndex)
{
var toSearch = Enumerable.Empty<string> ().Concat (toAdd1).Concat (toAdd2);
Assert.AreEqual (expectedIndex, toSearch.FindIndex (i => i == toFind));
}
static int memoTest1CallCount;
static object MemoTest1 ()
{
memoTest1CallCount++;
return new object ();
}
[Test]
public void TestMemoizeMethod1 ()
{
var f1 = CoreExtensions.Memoize (MemoTest1);
var obj1 = f1 ();
var obj2 = f1 ();
Assert.AreSame (obj1, obj2);
Assert.AreEqual (1, memoTest1CallCount);
}
[Test]
public void TestMemoizeMethodsAreDifferent ()
{
var f1 = CoreExtensions.Memoize (MemoTest1);
var f2 = CoreExtensions.Memoize (MemoTest1);
Assert.AreNotSame (f1(), f2());
Assert.AreEqual (2, memoTest1CallCount);
}
static int memoTest2CallCount;
const int knownArg = 1;
static object MemoTest2 (int a)
{
memoTest2CallCount++;
if (a == knownArg)
return new object ();
return new object ();
}
[Test]
public void TestMemoizeMethod2 ()
{
var f2 = CoreExtensions.Memoize<int, object> (MemoTest2);
var obj11 = f2 (knownArg);
var obj12 = f2 (knownArg);
var obj21 = f2 (knownArg + 1);
var obj22 = f2 (knownArg + 1);
Assert.AreSame (obj11, obj12);
Assert.AreSame (obj21, obj22);
Assert.AreNotSame (obj11, obj22);
Assert.AreEqual (2, memoTest2CallCount);
}
static int memoTest3CallCount;
static object MemoTest3 (int a, int b)
{
memoTest3CallCount++;
if (a == knownArg && b == knownArg)
return new object ();
if (a != knownArg) {
if (b != knownArg)
return new object ();
return new object ();
}
return new object ();
}
[Test]
public void TestMemoizeMethod3 ()
{
var f2 = CoreExtensions.Memoize<int, int, object> (MemoTest3);
var obj1 = f2 (knownArg, knownArg);
var obj2 = f2 (knownArg, knownArg + 1);
var obj3 = f2 (knownArg + 1, knownArg);
var obj4 = f2 (knownArg + 1, knownArg + 1);
Assert.AreNotSame (obj1, obj2);
Assert.AreNotSame (obj2, obj3);
Assert.AreNotSame (obj3, obj4);
// Force this, we already test the general algorithm in memo1 and memo2.
obj1 = f2 (knownArg, knownArg);
Assert.AreEqual (4, memoTest3CallCount);
}
}
}
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