Question

I have a unit test like so:

    [Test]
    public void DataIn_NoOfRowsReached_CreatesSequentialData()
    {
        //Assert
        MyLogic logic = SetupLogic();
        logic.NoOfRows = 3;

        logic.DataIn(1, "1,4,7");
        logic.DataIn(2, "2,5,8");
        logic.DataIn(3, "3,6,9");

        CollectionAssert.AreEqual(new[] { "1", "2", "3", "4", "5", "6", "7", "8", "9" }, logic.ExpectedValues);
    }

Each DataIn call adds the passed in data to a separate list depending on ID (1st param). When the NoOfRows number equals the DataIn input Id it merges the data to be sequential. I then test to check this.

I now want to use test cases but I cannot see any easy way to do this without putting if statements and various optional parameters in the test method. I don’t really want to duplicate the tests for various scenarios.

The NoOfRows maximum is 6.

Answer 1

I believe this is what you are looking for. Leverage the params keyword to allow passing in an arbitrary amount of strings.

[Test]
public void DataIn_NoOfRowsReached_CreatesSequentialData()
{
    MyGenericTest("1,4,7", "2,5,8", "3,6,9");
}

private void MyGenericTest(params string[] inputs)
{
    //Assert
    MyLogic logic = SetupLogic();
    logic.NoOfRows = inputs.Length;

    List<string> allNumbers = new List<string>();
    for(int i = 0; i < inputs.Length; i++)
    {
       logic.DataIn(i + 1, inputs[i]);
       allNumbers.AddRange(inputs[i].Split(',');
    }

    allNumbers.Sort();
    CollectionAssert.AreEqual(allNumbers.Distinct(), logic.ExpectedValues);
}

This just does string sorting… if you have numbers that are bigger than 9, you’ll want to add your own compare function to the Sort() method.