public void CapitalizeWords_NullArgument_ThrowArgNullException()
{
Assert.That(() => Capitalize.CapitalizeWords(null), Throws.ArgumentNullException);
}
public void CapitalizeWords_WhenCalled_ReturnCapitalizedString(string str, string expectedResult)
{
var result = Capitalize.CapitalizeWords(str);
Assert.That(result, Is.EqualTo(expectedResult));
}