restructure to allow cargo tests

tests/main.rs

@@ -0,0 +1,27 @@
+use marble_machinations::marble_engine::{board::Board, Machine};
+
+#[test]
+fn creating_marbles_cause_indirect_claim() {
+	let mut eng = Machine::new_empty();
+	eng.set_board(Board::parse(
+		"
+  I
+o 2
+   B-        o
+  B |      |-*-|
+  |-+o     |   |
+*-| |*     -B B-
+
+     1       3
+
+
+
+
+     I       I
+",
+	));
+	for _ in 0..9 {
+		eng.step();
+	}
+	assert_eq!(eng.output(), [1, 2, 3]);
+}