public void AddInPlace_IfThisIsNull_ThrowArgumentNullException()
{
double[][] target = null;
var other = new[] { new[] { 1.0, 2.0 }, new[] { 3.0, 4.0 } };
// ReSharper disable once ExpressionIsAlwaysNull
Action action = () => target.AddInPlace(other);
action.ShouldThrow <ArgumentNullException>()
.Where(e => e.ParamName == "target");
}