C＃-断言两个对象在单元测试中相等 [英] C# - Asserting two objects are equal in unit tests

问题描述

使用Nunit或Microsoft.VisualStudio.TestTools.UnitTesting。现在我的断言失败。

Either using Nunit or Microsoft.VisualStudio.TestTools.UnitTesting. Right now my assertion fails.

    [TestMethod]
    public void GivenEmptyBoardExpectEmptyBoard()
    {
        var test = new Board();

        var input = new Board()
            {
                Rows = new List<Row>()
                    {
                        new Row(){Cells = new List<int>(){0,0,0,0}},
                        new Row(){Cells = new List<int>(){0,0,0,0}},
                        new Row(){Cells = new List<int>(){0,0,0,0}},
                        new Row(){Cells = new List<int>(){0,0,0,0}},
                    }
            };

        var expected = new Board()
        {
            Rows = new List<Row>()
                    {
                        new Row(){Cells = new List<int>(){0,0,0,0}},
                        new Row(){Cells = new List<int>(){0,0,0,0}},
                        new Row(){Cells = new List<int>(){0,0,0,0}},
                        new Row(){Cells = new List<int>(){0,0,0,0}},
                    }
        };

        var lifeOrchestration = new LifeOrchestration();

        var actual = lifeOrchestration.Evolve(input);

        Assert.AreEqual(expected, actual);
    }

推荐答案

您有两种不同的选择 Board 实例，因此您对 Assert.AreEqual 的调用将失败。即使它们的全部内容看起来相同，您也要比较引用，而不是基础值。

You've got two different Board instances, so your call to Assert.AreEqual will fail. Even if their entire contents appear to be the same, you're comparing references, not the underlying values.

您必须指定是什么使两个木板实例相等。

You have to specify what makes two Board instances equal.

您可以在测试中做到这一点：

You can do it in your test:

Assert.AreEqual(expected.Rows.Count, actual.Rows.Count);
Assert.AreEqual(expected.Rows[0].Cells[0], actual.Rows[0].Cells[0]);

// Lots more tests of equality...

或者您可以在您的课程中进行操作：（请注意，我是即时编写的，您需要对此进行调整）

Or you can do it in your classes: (note I wrote this on-the-fly - you'll want to adjust this)

public class Board
{
    public List<Row> Rows = new List<Row>();

    public override bool Equals(object obj)
    {
        var board = obj as Board;

        if (board == null)
            return false;

        if (board.Rows.Count != Rows.Count)
            return false;

        return !board.Rows.Where((t, i) => !t.Equals(Rows[i])).Any();
    }

    public override int GetHashCode()
    {
        // determine what's appropriate to return here - a unique board id may be appropriate if available
    }
}

public class Row
{
    public List<int> Cells = new List<int>(); 

    public override bool Equals(object obj)
    {
        var row = obj as Row;

        if (row == null)
            return false;

        if (row.Cells.Count != Cells.Count)
            return false;

        if (row.Cells.Except(Cells).Any())
            return false;

        return true;
    }

    public override int GetHashCode()
    {
        // determine what's appropriate to return here - a unique row id may be appropriate if available
    }
}

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