VB.NET and NUnit - TDD

Question

I am learning TDD with VB.NET and NUnit. I want to know what is best to do: Use many Assert methods inside a test method or use assert for a method?

This is my code. Thank.

Imports NUnit.Framework

<TestFixture()> _
Public Class CalculatorTest
<Test()> _
Public Sub TestAdd()
    Dim calculator As Calculator = New Calculator()

    Assert.AreEqual(2, calculator.sum(1, 1))
    Assert.AreNotEqual(3, calculator.sum(2, 2))
    Assert.AreEqual(-1, calculator.sum(0, -1))
        Assert.AreNotEqual(3, calculator.sum(1, 1))
    End Sub
End Class

Answer 1

The best way to think about this is to check one thing at a time. Use as many statements as necessary to verify this, but usually only one. Several statements may be a sign that you are testing several pieces at the same time, but this, in my opinion, is not a very strict rule. The best guide is that you do not want to create dependencies in your tests between independent concepts.

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Answer 2

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NUnit TestCases:

<Test()> _
<TestCase(1, 1, 2)> _
<TestCase(1,-1, 0)> _
<TestCase(0,-1,-1)> _
Public Sub Calculator_Add_ReturnsExpectedResult(Integer a, Integer b, Integer expected)
    Dim calculator As Calculator = New Calculator()

    Assert.AreEqual(expected, calculator.sum(a, b))
End Class

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