C＃单元测试中的简单易读方法，可在断言相等性失败时仅显示对象之间的差异

Question

我有一种方法可以测试更改POCO布局对象状态的单元：

    [TestMethod]
    public void A_Test_Method()
    {
        // Arrange
        const double adjustmentValue = 50;

        var expectedLayout = CreateDefaultLayout();
        ... // set some values

        var actualLayout = CreateDefaultLayout();
        ...

        var runtimeHelper = new LayoutRuntimeHelper(actualLayout);

        // Act

        runtimeHelper.SetPrintVerticalAdjustment(actualLayout.Print.VerticalAdjustment.Orientation, adjustmentValue);

        // Assert

        Assert.AreEqual(expectedLayout, actualLayout);
    }

注意：ToString（）方法被覆盖，因此它打印像JSON这样的整个对象，而不仅仅是类型。 Equals（）也会发生同样的情况。

问题在于布局对象仅仅是个大对象，因此测试输出也变得很大，我必须找出这些对象之间的差异。 那么，如何告诉测试框架仅输出差异？

Answer 1

感谢Mike Zboray的评论，FluentAssertions Nuget软件包使其完美。 不得不替换为：

Assert.AreEqual(expectedLayout, actualLayout);

对此：

actualLayout.Should().BeEquivalentTo(expectedLayout);

测试输出：

Expected member Image.VerticalPositionAbsoluteMm to be 550.0, but found 650.0.
Expected member Print.VerticalPositionAbsoluteMm to be 550.0, but found 650.0.
Expected member Print.VerticalAdjustment.Orientation to be -1M, but found 1M.

With configuration:
- Use declared types and members
- Compare enums by value
- Match member by name (or throw)
- Without automatic conversion.
- Be strict about the order of items in byte arrays

... (Exception Stacktrace)