使用 NSubstitute 检查接听电话的数量是否在范围内

Question

有没有办法用 NSubstitute 检查接听电话的数量是否在一定范围内？

我想做这样的事情：

myMock.Received(r => r > 1 && r <= 5).MyMethod();

或者，如果我能获得已接电话的确切数量，也能完成这项工作。我正在单元测试重试和超时，并基于系统负载和其他测试运行在单元测试执行期间重试次数可能会有所不同。

Answer 1

NSubstitute API 目前不完全支持这一点（但这是个好主意！）。

有一种 hacky-ish 使用 unofficial .ReceivedCalls 扩展的方法：

var calls = myMock.ReceivedCalls()
    .Count(x => x.GetMethodInfo().Name == nameof(myMock.MyMethod));
Assert.InRange(calls, 1, 5);

更好的方法是使用来自 NSubstitute.ReceivedExtensions 命名空间的自定义 Quantity：

// DISCLAIMER: draft code only. Review and test before using.
public class RangeQuantity : Quantity {
    private readonly int min;
    private readonly int maxInclusive;
    public RangeQuantity(int min, int maxInclusive) {
        // TODO: validate args, min < maxInclusive.
        this.min = min;
        this.maxInclusive = maxInclusive;
    }
    public override string Describe(string singularNoun, string pluralNoun) => 
        $"between {min} and {maxInclusive} (inclusive) {((maxInclusive == 1) ? singularNoun : pluralNoun)}";

    public override bool Matches<T>(IEnumerable<T> items) {
        var count = items.Count();
        return count >= min && count <= maxInclusive;
    }

    public override bool RequiresMoreThan<T>(IEnumerable<T> items) => items.Count() < min;
}

然后：

myMock.Received(new RangeQuantity(3,5)).MyMethod();

（请注意，您需要 using NSubstitute.ReceivedExtensions;。）

使用 NSubstitute 检查接听电话的数量是否在范围内

Check that number of received calls is within range with NSubstitute

c#

mocking

nsubstitute