wehub-resource-sync
116 lines
4.1 KiB
C#
116 lines
4.1 KiB
C#
/*
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* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
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* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using NUnit.Framework;
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using QuantConnect.Util;
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namespace QuantConnect.Tests.Common.Util
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{
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[TestFixture]
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public class MemoizingEnumerableTests
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{
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[Test]
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public void EnumeratesList()
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{
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var list = new List<int> {1, 2, 3, 4, 5};
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var memoized = new MemoizingEnumerable<int>(list);
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CollectionAssert.AreEqual(list, memoized);
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}
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[Test]
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public void ChainedMemoizingEnumerables()
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{
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var list = new int [] { 1, 2, 3, 4, 5 };
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var memoized = new MemoizingEnumerable<int>(list);
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var memoized2 = new MemoizingEnumerable<int>(memoized);
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var memoized3 = new MemoizingEnumerable<int>(memoized2);
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CollectionAssert.AreEqual(list, memoized3);
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}
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[Test]
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public void EnumeratesOnce()
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{
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int i = 0;
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var enumerable = Enumerable.Range(0, 10).Select(x => i++);
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var memoized = new MemoizingEnumerable<int>(enumerable);
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// enumerating memoized twice shouldn't matter
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CollectionAssert.AreEqual(memoized.ToList(), memoized.ToList());
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}
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[Test]
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public void GetsCount()
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{
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var list = new List<int> {1, 2, 3, 4, 5};
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var memoized = new MemoizingEnumerable<int>(list);
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Assert.AreEqual(5, memoized.Count);
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Assert.AreEqual(memoized.Count, memoized.ToList().Count);
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}
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[Test]
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public void EmptyIsFalseForNonEmptyEnumerable()
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{
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var list = new List<int> {1, 2, 3, 4, 5};
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var memoized = new MemoizingEnumerable<int>(list);
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Assert.IsFalse(memoized.Empty);
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// still enumerates fully after checking Empty
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CollectionAssert.AreEqual(list, memoized);
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}
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[Test]
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public void EmptyIsTrueForEmptyEnumerable()
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{
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var memoized = new MemoizingEnumerable<int>(Enumerable.Empty<int>());
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Assert.IsTrue(memoized.Empty);
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}
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[Test]
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public void EmptyDoesNotForceFullEnumeration()
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{
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var enumerated = 0;
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var enumerable = Enumerable.Range(0, 10).Select(x => { enumerated++; return x; });
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var memoized = new MemoizingEnumerable<int>(enumerable);
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Assert.IsFalse(memoized.Empty);
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// only the first item should have been enumerated
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Assert.AreEqual(1, enumerated);
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}
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[Test]
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public void EnumerationAfterEmptyKeepsIntegrity()
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{
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var i = 0;
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// lazy source where each element is produced exactly once
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var enumerable = Enumerable.Range(0, 5).Select(x => i++);
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var memoized = new MemoizingEnumerable<int>(enumerable);
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// accessing Empty consumes the first item from the source
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Assert.IsFalse(memoized.Empty);
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// enumerating should still yield the full sequence without duplicating the first item
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CollectionAssert.AreEqual(new[] { 0, 1, 2, 3, 4 }, memoized.ToList());
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}
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[Test]
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public void EmptyThrowsWhenDisabled()
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{
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var list = new List<int> {1, 2, 3, 4, 5};
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var memoized = new MemoizingEnumerable<int>(list) { Enabled = false };
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Assert.Throws<InvalidOperationException>(() => { var _ = memoized.Empty; });
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}
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}
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}
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