Test Wood is an unreleased Wood type that can only be found in the game files. It is classified as "Test" and would grow only in the "Test Region", which is a region automatically removed whenever the server is started.
It is believed that Test Wood was used as a model for constructing Fir Wood, Pine Wood, the leaves for Phantom Wood, and is very likely derived from Oak Wood. This wood was likely used during the testing stages of the game.
Test Wood maintains the same color of wood, bark, and leaves as Oak Wood, and would generally grow to be the same height, though the tree does not have split branches. It would grow branches similar to Pine Wood and Fir Wood. Occasionally, these branches may split. The leaves of Test Wood trees are the same width and height as the width of the tree's trunk, similar to Phantom Wood.
Oddly, this tree has different prices in comparison to Oak Wood. Although the unit price per plank is $0.2 Money less than Elm Wood (compared to Oak Wood at $10 Money per unit), the log price per unit is higher than the plank price at $3 Money per unit, compared to the Oak Wood's log unit price of $1.5 Money.