made tests like way better

test/test_assets/README.md

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+# Test Assets
+
+## cube.stl
+
+Perfect cube with length of 2 for all sides and a center of gravity at origin.
+
+## 2_4_8_cuboid.stl
+
+Cube with dimensions:
+
+- height = 2
+- depth = 4
+- width = 8
+
+Center of gravity at origin.
+
+## sphere.stl
+
+Perfect sphere with radius of 1 and a center of gravity at origin.
+
+## slender_rod.stl
+
+Negligible thickness cylinder with length of 10, radius of 0.1, and a center of gravity at origin.
+
+## cylinder.stl
+
+Cylinder with length of 10, radius of 1, and a center of gravity at origin.