fluent-assertions - 流利的断言仅包含

Question

使用 FluentAssertions，我想检查一个列表是否只包含具有某些值的对象。

例如，我尝试使用 lambda；

myobject.Should().OnlyContain(x=>x.SomeProperty == "SomeValue");            

但是，不允许使用此语法。

Answer 1

我很确定这应该可行。从 FluentAssertions 的 GitHub 存储库中查看这个示例单元测试：

    [TestMethod]
    public void When_a_collection_contains_items_not_matching_a_predicate_it_should_throw()
    {
        //-----------------------------------------------------------------------------------------------------------
        // Arrange
        //-----------------------------------------------------------------------------------------------------------
        IEnumerable<int> collection = new[] { 2, 12, 3, 11, 2 };

        //-----------------------------------------------------------------------------------------------------------
        // Act
        //-----------------------------------------------------------------------------------------------------------
        Action act = () => collection.Should().OnlyContain(i => i <= 10, "10 is the maximum");

        //-----------------------------------------------------------------------------------------------------------
        // Act
        //-----------------------------------------------------------------------------------------------------------
        act.ShouldThrow<AssertFailedException>().WithMessage(
            "Expected collection to contain only items matching (i <= 10) because 10 is the maximum, but {12, 11} do(es) not match.");
    }