All test files should be placed in appropriate subdirectory of "sources/".
Test file should be created using Synfig Studio version 1.0.2 (exactly this version). You can download it here - https://sourceforge.net/projects/synfig/files/releases/1.0.2/.
For creating a layer use "Layer" -> "Create Layer" menu command.
Please make sure to use ".sif" format when saving your file (not ".sifz").
For general usage of Synfig see documentation - https://wiki.synfig.org/Category:Manual