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AggregateTest.cs
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#region License and Terms
// MoreLINQ - Extensions to LINQ to Objects
// Copyright (c) 2019 Atif Aziz. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion
namespace MoreLinq.Test
{
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq.Expressions;
using NUnit.Framework;
using Experimental;
using System.Reactive.Linq;
using System.Reflection;
using static MoreLinq.Extensions.AppendExtension;
using static FuncModule;
[TestFixture]
public class AggregateTest
{
public static IEnumerable<TestCaseData> AccumulatorsTestSource(string name, int count) =>
/* Generates an invocation as follows for 2 accumulators:
Enumerable.Range(1, count)
.Shuffle()
.Aggregate(0, (s, e) => s + e,
0, (s, e) => s + e,
(sum1, sum2) => new[] { sum1, sum2 });
*/
from source in new[] { Enumerable.Range(1, count).Shuffle() }
let sum = source.Sum()
from m in typeof(MoreEnumerable).GetMethods(BindingFlags.Public | BindingFlags.Static)
where m.Name == nameof(MoreEnumerable.Aggregate)
&& m.IsGenericMethodDefinition
select new
{
Source = source,
Expectation = sum,
Instantiation = m.MakeGenericMethod(Enumerable.Repeat(typeof(int), m.GetGenericArguments().Length - 1)
.Append(typeof(int[])) // TResult
.ToArray()),
}
into m
let rst = m.Instantiation.GetParameters().Last().ParameterType
select new
{
m.Instantiation,
m.Source,
m.Expectation,
AccumulatorCount = (m.Instantiation.GetParameters().Length - 2 /* source + resultSelector */) / 2 /* seed + accumulator */,
ResultSelectorType = rst,
Parameters =
rst.GetMethod("Invoke") is { } invoke
? invoke.GetParameters()
.Select(p => Expression.Parameter(p.ParameterType))
.ToArray()
: throw new MissingMethodException("""Method "Invoke" not found."""),
}
into m
let resultSelector =
Expression.Lambda(m.ResultSelectorType,
Expression.NewArrayInit(typeof(int), m.Parameters),
m.Parameters)
.Compile()
let accumulator = Func((int s, int n) => s + n)
select new
{
Name = $"{name}({m.AccumulatorCount})",
Method = m.Instantiation,
Args =
Enumerable.Repeat(m.Source, 1)
.Concat(from pairs in Enumerable.Repeat(new object[] { /* seed */ 0, accumulator }, m.AccumulatorCount)
from pair in pairs
select pair)
.Append(resultSelector)
.ToArray(),
Expectation =
Enumerable.Repeat(m.Expectation, m.AccumulatorCount)
.ToArray(),
}
into t
select new TestCaseData(t.Method, t.Args).SetName(t.Name).Returns(t.Expectation);
#pragma warning disable NUnit1018 // Parameter count does not match (false negative)
[TestCaseSource(nameof(AccumulatorsTestSource), [nameof(Accumulators), 10])]
#pragma warning restore NUnit1018 // Parameter count does not match
public object? Accumulators(MethodInfo method, object[] args) =>
method.Invoke(null, args);
[Test]
public void SevenUniqueAccumulators()
{
using var source = Enumerable.Range(1, 10).AsTestingSequence();
var result =
source.Shuffle()
.Select(n => new { Num = n, Str = n.ToString(CultureInfo.InvariantCulture) })
.Aggregate(0, (s, e) => s + e.Num,
0, (s, e) => e.Num % 2 == 0 ? s + e.Num : s,
0, (s, _) => s + 1,
(int?)null, (s, e) => s is { } n ? Math.Min(n, e.Num) : e.Num,
(int?)null, (s, e) => s is { } n ? Math.Max(n, e.Num) : e.Num,
new HashSet<int>(), (s, e) => { _ = s.Add(e.Str.Length); return s; },
new List<(int Num, string Str)>(), (s, e) => { s.Add((e.Num, e.Str)); return s; },
(sum, esum, count, min, max, lengths, items) => new
{
Sum = sum,
EvenSum = esum,
Count = count,
Average = (double)sum / count,
Min = min ?? throw new InvalidOperationException(),
Max = max ?? throw new InvalidOperationException(),
UniqueLengths = lengths,
Items = items,
});
Assert.That(result.Sum , Is.EqualTo(55));
Assert.That(result.EvenSum, Is.EqualTo(30));
Assert.That(result.Count , Is.EqualTo(10));
Assert.That(result.Average, Is.EqualTo(5.5));
Assert.That(result.Min , Is.EqualTo(1));
Assert.That(result.Max , Is.EqualTo(10));
result.UniqueLengths.OrderBy(n => n).AssertSequenceEqual(1, 2);
result.Items
.Select(e => new { e.Num, e.Str })
.OrderBy(e => e.Num)
.AssertSequenceEqual(new { Num = 1, Str = "1" },
new { Num = 2, Str = "2" },
new { Num = 3, Str = "3" },
new { Num = 4, Str = "4" },
new { Num = 5, Str = "5" },
new { Num = 6, Str = "6" },
new { Num = 7, Str = "7" },
new { Num = 8, Str = "8" },
new { Num = 9, Str = "9" },
new { Num = 10, Str = "10" });
}
[Test]
public void SevenUniqueAccumulatorComprehensions()
{
using var source = Enumerable.Range(1, 10).AsTestingSequence();
var result =
source.Shuffle()
.Select(n => new { Num = n, Str = n.ToString(CultureInfo.InvariantCulture) })
.Aggregate(s => s.Sum(e => e.Num),
s => s.Select(e => e.Num).Where(n => n % 2 == 0).Sum(),
s => s.Count(),
s => s.Min(e => e.Num),
s => s.Max(e => e.Num),
s => s.Select(e => e.Str.Length).Distinct().ToArray(),
s => s.ToArray(),
(sum, esum, count, min, max, lengths, items) => new
{
Sum = sum,
EvenSum = esum,
Count = count,
Average = (double)sum / count,
Min = min,
Max = max,
UniqueLengths = lengths,
Items = items,
});
Assert.That(result.Sum , Is.EqualTo(55));
Assert.That(result.EvenSum, Is.EqualTo(30));
Assert.That(result.Count , Is.EqualTo(10));
Assert.That(result.Average, Is.EqualTo(5.5));
Assert.That(result.Min , Is.EqualTo(1));
Assert.That(result.Max , Is.EqualTo(10));
result.UniqueLengths.OrderBy(n => n).AssertSequenceEqual(1, 2);
result.Items
.OrderBy(e => e.Num)
.AssertSequenceEqual(new { Num = 1, Str = "1" },
new { Num = 2, Str = "2" },
new { Num = 3, Str = "3" },
new { Num = 4, Str = "4" },
new { Num = 5, Str = "5" },
new { Num = 6, Str = "6" },
new { Num = 7, Str = "7" },
new { Num = 8, Str = "8" },
new { Num = 9, Str = "9" },
new { Num = 10, Str = "10" });
}
[Test(Description = "https://github.com/morelinq/MoreLINQ/issues/616")]
public void Issue616()
{
using var source = Enumerable.Range(1, 10).AsTestingSequence();
var (first, last) = source.Aggregate(ds => ds.FirstAsync(),
ds => ds.LastAsync(),
ValueTuple.Create);
Assert.That(first, Is.EqualTo(1));
Assert.That(last, Is.EqualTo(10));
}
}
}