public void ManyMatch()
{
var(t, x) =
Source.Concat(MoreEnumerable.From(BreakingFunc.Of <int>()))
.SingleOrNone(x => x > 200);
Assert.That(t, Is.False);
Assert.That(x, Is.Zero);
}
public void Many()
{
var source = MoreEnumerable.From(() => 123, BreakingFunc.Of <int>());
var(t, x) = source.FirstOrNone();
Assert.That(t, Is.True);
Assert.That(x, Is.EqualTo(123));
}
public void AtLeastDoesNotIterateUnnecessaryElements()
{
var source = MoreEnumerable.From(() => 1,
() => 2,
() => throw new TestException());
Assert.IsTrue(source.AtLeast(2));
}
public void Many()
{
var source = MoreEnumerable.From(() => 123, () => 456, () => 789);
var(t, x) = source.LastOrNone();
Assert.That(t, Is.True);
Assert.That(x, Is.EqualTo(789));
}
public void One()
{
var source = MoreEnumerable.From(() => 123);
var(t, x) = source.LastOrNone();
Assert.That(t, Is.True);
Assert.That(x, Is.EqualTo(123));
}
public void Many()
{
var source = MoreEnumerable.From(() => 123, () => 456, BreakingFunc.Of <object>());
var(t, x) = source.SingleOrNone();
Assert.That(t, Is.False);
Assert.That(x, Is.Null);
}
public void TestFromIsLazy()
{
var breakingFunc = BreakingFunc.Of <int>();
MoreEnumerable.From(breakingFunc);
MoreEnumerable.From(breakingFunc, breakingFunc);
MoreEnumerable.From(breakingFunc, breakingFunc, breakingFunc);
MoreEnumerable.From(breakingFunc, breakingFunc, breakingFunc, breakingFunc);
}
public void AtMostDoesNotIterateUnnecessaryElements()
{
var source = MoreEnumerable.From(() => 1,
() => 2,
() => 3,
() => throw new InvalidOperationException());
Assert.IsFalse(source.AtMost(2));
}
public void ExactlyDoesNotIterateUnnecessaryElements()
{
var source = MoreEnumerable.From(() => 1,
() => 2,
() => 3,
() => throw new TestException());
Assert.IsFalse(source.Exactly(2));
}
public void CountBetweenDoesNotIterateUnnecessaryElements()
{
var source = MoreEnumerable.From(() => 1,
() => 2,
() => 3,
() => 4,
() => throw new TestException());
Assert.False(source.CountBetween(2, 3));
}
public void MoveNextIsNotCalledUnnecessarily()
{
using var s1 = TestingSequence.Of(1, 2);
using var s2 = TestingSequence.Of(1, 2, 3);
using var s3 = MoreEnumerable.From(() => 1,
() => 2,
() => throw new TestException())
.AsTestingSequence();
Assert.Throws <InvalidOperationException>(() =>
s1.EquiZip(s2, s3, (x, y, z) => x + y + z).Consume());
}
public void CompareCountDoesNotIterateUnnecessaryElements()
{
var seq1 = MoreEnumerable.From(() => 1,
() => 2,
() => 3,
() => 4,
() => throw new TestException());
var seq2 = Enumerable.Range(1, 3);
Assert.AreEqual(1, seq1.CompareCount(seq2));
Assert.AreEqual(-1, seq2.CompareCount(seq1));
}
public void FlattenInterruptedIterationDisposesInnerSequences()
{
using var inner1 = TestingSequence.Of(4, 5);
using var inner2 = MoreEnumerable.From(() => true,
() => false,
() => throw new TestException())
.AsTestingSequence();
using var inner3 = TestingSequence.Of <object>(6, inner2, 7);
using var source = TestingSequence.Of <object>(inner1, inner3);
Assert.Throws <TestException>(() =>
source.Flatten().Consume());
}
public void MoveNextIsNotCalledUnnecessarilyWhenFirstIsShorter()
{
using (var s1 = TestingSequence.Of(1, 2))
using (var s2 = MoreEnumerable.From(() => 4,
() => 5,
() => throw new TestException())
.AsTestingSequence())
{
var zipped = s1.ZipShortest(s2, Tuple.Create);
Assert.That(zipped, Is.Not.Null);
zipped.AssertSequenceEqual((1, 4), (2, 5));
}
}
public void ZipShortestNotIterateUnnecessaryElements()
{
using (var s1 = MoreEnumerable.From(() => 4,
() => 5,
() => 6,
() => throw new TestException())
.AsTestingSequence())
using (var s2 = TestingSequence.Of(1, 2))
{
var zipped = s1.ZipShortest(s2, Tuple.Create);
Assert.That(zipped, Is.Not.Null);
zipped.AssertSequenceEqual((4, 1), (5, 2));
}
}
public void TestFromInvokesMethodsMultipleTimes(int numArgs)
{
var evals = new [] { 0, 0, 0, 0 };
int F1()
{
evals[0]++; return(-2);
}
int F2()
{
evals[1]++; return(-2);
}
int F3()
{
evals[2]++; return(-2);
}
int F4()
{
evals[3]++; return(-2);
}
IEnumerable <int> results;
switch (numArgs)
{
case 1: results = MoreEnumerable.From(F1); break;
case 2: results = MoreEnumerable.From(F1, F2); break;
case 3: results = MoreEnumerable.From(F1, F2, F3); break;
case 4: results = MoreEnumerable.From(F1, F2, F3, F4); break;
default: throw new ArgumentOutOfRangeException(nameof(numArgs));
}
results.Consume();
results.Consume();
results.Consume();
// numArgs functions were evaluated...
evals.Take(numArgs).AssertSequenceEqual(Enumerable.Repeat(3, numArgs));
// safety check: we didn't evaluate functions past numArgs
evals.Skip(numArgs).AssertSequenceEqual(Enumerable.Repeat(0, evals.Length - numArgs));
}
public void FlattenEvaluatesInnerSequencesLazily()
{
var source = new object[]
{
1, 2, 3, 4, 5,
new object[]
{
6, 7,
new object[]
{
8, 9,
MoreEnumerable.From
(
() => 10,
() => throw new TestException(),
() => 12
),
13, 14, 15,
},
public void AcquireSome()
{
Disposable a = null;
Disposable b = null;
Disposable c = null;
var allocators = MoreEnumerable.From(() => a = new Disposable(),
() => b = new Disposable(),
() => throw new TestException(),
() => c = new Disposable());
Assert.Throws <TestException>(() => allocators.Acquire());
Assert.That(a, Is.Not.Null);
Assert.That(a.Disposed, Is.True);
Assert.That(b, Is.Not.Null);
Assert.That(b.Disposed, Is.True);
Assert.That(c, Is.Null);
}
public void AcquireAll()
{
Disposable a = null;
Disposable b = null;
Disposable c = null;
var allocators = MoreEnumerable.From(() => a = new Disposable(),
() => b = new Disposable(),
() => c = new Disposable());
var disposables = allocators.Acquire();
Assert.That(disposables.Length, Is.EqualTo(3));
foreach (var disposable in disposables.ZipShortest(new[] { a, b, c }, (act, exp) => new { Actual = act, Expected = exp }))
{
Assert.That(disposable.Actual, Is.SameAs(disposable.Expected));
Assert.That(disposable.Actual.Disposed, Is.False);
}
}
public void TestFromInvokesMethods(int numArgs)
{
int F1() => - 2;
int F2() => 4;
int F3() => int.MaxValue;
int F4() => int.MinValue;
switch (numArgs)
{
case 1: MoreEnumerable.From(F1).AssertSequenceEqual(F1()); break;
case 2: MoreEnumerable.From(F1, F2).AssertSequenceEqual(F1(), F2()); break;
case 3: MoreEnumerable.From(F1, F2, F3).AssertSequenceEqual(F1(), F2(), F3()); break;
case 4: MoreEnumerable.From(F1, F2, F3, F4).AssertSequenceEqual(F1(), F2(), F3(), F4()); break;
default: throw new ArgumentOutOfRangeException(nameof(numArgs));
}
}
public void FlattenInterruptedIterationDisposesInnerSequences()
{
using (var inner1 = TestingSequence.Of(4, 5))
using (var inner2 = MoreEnumerable.From(() => true,
() => false,
() => throw new InvalidOperationException())
.AsTestingSequence())
using (var inner3 = TestingSequence.Of <object>(6, inner2, 7))
{
var source = new object[]
{
inner1,
inner3,
};
using (var test = source.AsTestingSequence())
{
Assert.Throws <InvalidOperationException>(() =>
test.Flatten().Consume());
}
}
}
public void IndexBytDoesNotIterateUnnecessaryElements()
{
var source = MoreEnumerable.From(() => "ana",
() => "beatriz",
() => "carla",
() => "bob",
() => "davi",
() => throw new TestException(),
() => "angelo",
() => "carlos");
var result = source.IndexBy(x => x.First());
result.Take(5).AssertSequenceEqual(
KeyValuePair.Create(0, "ana"),
KeyValuePair.Create(0, "beatriz"),
KeyValuePair.Create(0, "carla"),
KeyValuePair.Create(1, "bob"),
KeyValuePair.Create(0, "davi"));
Assert.Throws <TestException>(() =>
result.ElementAt(5));
}
public void ScanByDoesNotIterateUnnecessaryElements()
{
var source = MoreEnumerable.From(() => "ana",
() => "beatriz",
() => "carla",
() => "bob",
() => "davi",
() => throw new TestException(),
() => "angelo",
() => "carlos");
var result = source.ScanBy(c => c.First(), k => - 1, (i, k, e) => i + 1);
result.Take(5).AssertSequenceEqual(
KeyValuePair.Create('a', 0),
KeyValuePair.Create('b', 0),
KeyValuePair.Create('c', 0),
KeyValuePair.Create('b', 1),
KeyValuePair.Create('d', 0));
Assert.Throws <TestException>(() =>
result.ElementAt(5));
}