[BugFix] Renamed TestBFS -> TestDFS for depth first search tests.

Author: exterkamp

tests/test_2d_dfs.py

@@ -1,7 +1,7 @@
 import unittest
 from searches.depth_first_search import depth_first_search
 
-class TestBFS(unittest.TestCase):
+class TestDFS(unittest.TestCase):
 
     def make_simple_grid(self):
         return [