Tests silently fail when there is a panic occur

[ArtemkaKun]

Consider this test

test "Position id bigger than count of all positions" {
	mut tree := &OctreeNode{
		center: tellusim.TSVector3f{x: 0, y: 0, z: 0},
		size: 1,
	}

	positions := []tellusim.TSVector3f{}
	error := insert(tree, positions, 0, 1)

	t.assert_eq(error.unwrap_err().msg(), POSITION_ID_TOO_BIG_ERROR, "Must be error")
}

if error is not error, code error.unwrap_err().msg() will panic, and when running the test all tests will fail silently and output will not appear in the console