单元测试间歇OOM异常

我们有几个类似的单元测试都扔间歇OutOfMemoryExceptions，打破我们的CI管道：单元测试间歇OOM异常

public void Evaluate_Node1GreaterThanNode2_ReturnsTrue_Decimal() 
{ 
    //Arrange 
    var generator = _fixture.Create<Generator<decimal>>(); 

    var value1 = _fixture.Create<decimal>(); 
    var value2 = generator.Where(x => x < value1).First(); 
    Node.Node1.Evaluate(Arg.Any<IPeriod>(), Arg.Any<IColleaguePeriodDataManager>()).Returns(value1); 
    Node.Node2.Evaluate(Arg.Any<IPeriod>(), Arg.Any<IColleaguePeriodDataManager>()).Returns(value2); 

    //Act 
    var result = Node.Evaluate(); 

    //Assert 
    Assert.IsTrue(result); 
    Assert.IsTrue(Node.EvaluatedResult); 
}

正如你可以看到我们使用AutoFixture的生成器来创建数字，大于/小于初始值：

generator.Where(x => x < value1).First();

很明显，这种方法是行不通的。有人有工作吗？

这里的错误和堆栈跟踪：

System.OutOfMemoryException : Array dimensions exceeded supported range. 
at System.Collections.Generic.HashSet`1.SetCapacity(Int32 newSize, Boolean forceNewHashCodes) 
    at System.Collections.Generic.HashSet`1.AddIfNotPresent(T value) 
    at Ploeh.AutoFixture.RandomNumericSequenceGenerator.GetNextRandom() 
    at Ploeh.AutoFixture.RandomNumericSequenceGenerator.CreateRandom(Type request) 
    at Ploeh.AutoFixture.Kernel.CompositeSpecimenBuilder.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.CompositeSpecimenBuilder.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.Postprocessor`1.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.CompositeSpecimenBuilder.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.TracingBuilder.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.TerminatingWithPathSpecimenBuilder.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.RecursionGuard.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.RecursionGuard.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.CompositeSpecimenBuilder.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.CompositeSpecimenBuilder.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.Postprocessor`1.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.CompositeSpecimenBuilder.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.TracingBuilder.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.TerminatingWithPathSpecimenBuilder.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.RecursionGuard.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.Kernel.RecursionGuard.Create(Object request, ISpecimenContext context) 
    at Ploeh.AutoFixture.SpecimenFactory.Create[T](ISpecimenContext context, T seed) 
    at Ploeh.AutoFixture.SpecimenFactory.Create[T](ISpecimenContext context) 
    at Ploeh.AutoFixture.Generator`1.<GetEnumerator>d__2.MoveNext() 
    at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext() 
    at System.Linq.Enumerable.First[TSource](IEnumerable`1 source)

来源

2017-02-28 James Law

它看起来像测试场景需要value2比value1更大。一个简单的方法来做到这一点是这样的：

var x = fixture.Create<decimal>(); 
var y = fixture.Create<decimal>(); 
var value1 = Math.Min(x, y); 
var value2 = Math.Max(x, y) + 0.0001m; // Add small fraction to make it strictly greater

您可以重构这一个辅助方法，如果你不想看的临时变量x和y。

来源

2017-02-28 14:15:55

单元测试间歇OOM异常

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