How to set 2d array as parameter for unit testing

Question

If expected variable is integer, it simply goes like this

[DataRow(2)]
[TestMethod]
public void TestMethod(int expected)
{
      // some code...
}

But what should one do when there is 2d array int[,] instead of int parameter? When I try to do this

[DataRow(new int[,] { {0, 0}, {0, 0} })]
[TestMethod]
public void TestMethod(int[,] expected)
{
      // some code...
}

error says

An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type

So what happened when you run the second code?

Chetan
– Chetan

2020-01-19 02:35:15 +00:00
Commented Jan 19, 2020 at 2:35 — Chetan
– Chetan, Commented Jan 19, 2020 at 2:35

Nguyễn Văn Phong · Accepted Answer · 2021-04-08 08:28:36Z

5

You can achieve it by using DynamicData Attribute like below:

[DataTestMethod]
[DynamicData(nameof(TestDataMethod), DynamicDataSourceType.Method)]
public void TestMethod1(int[,] expected)
{
    // some code...
    var b = expected;
}

static IEnumerable<object[]> TestDataMethod()
{
    return new[] { new[] { new int[,] { { 0, 0 }, { 1, 1 } } } };
}

Output

edited Apr 8, 2021 at 8:28

answered Jan 19, 2020 at 3:46

Nguyễn Văn Phong

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2 Comments

Nguyễn Văn Phong Over a year ago

I've just updated my answer with the expected result image, Please take a look @Andrey

Andrey Over a year ago

Perfect! Thanks :)

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