Aim crop farmers at targets with pitch limit

tests/test_crop_batch.py

@@ -6,6 +6,23 @@ from mosfet.jobs.gather_crop import GatherCropStates
 
 
 class CropBatchTests(unittest.TestCase):
+    def test_navigation_looks_at_the_crop_target(self):
+        crop = (5, 64, 8)
+
+        class FakeWorld:
+            @staticmethod
+            def path_to_place(_start, _target):
+                return [(1, 64, 1), crop]
+
+        g = Munch(world=FakeWorld(), pos=(1, 64, 1), path=[], look_at=None)
+        state = GatherCropStates(g)
+        state.crop = crop
+
+        state.nav_to_crop()
+
+        self.assertEqual(g.look_at, crop)
+        self.assertEqual(g.path[-1], crop)
+
     def test_gather_crop_finishes_after_sixteen_successful_replants(self):
         unripe_wheat = blocks.MCD_BLOCKS['wheat']['minStateId']
         mature_wheat = blocks.MATURE_WHEAT_ID