From 1168727915fa565c7b4cd63e2cd7c0b499437280 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miguel=20S=C3=A1nchez=20de=20Le=C3=B3n=20Peque?=
 <peque@neosit.es>
Date: Thu, 22 Mar 2018 00:16:47 +0100
Subject: [PATCH] fixup! Add some tests and Travis integration

---
 test_mazes.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/test_mazes.py b/test_mazes.py
index 3829ed0..81420dc 100644
--- a/test_mazes.py
+++ b/test_mazes.py
@@ -1,6 +1,7 @@
 """
 Basic tests to ensure maze files are properly formatted.
 """
+from collections import Counter
 from pathlib import Path
 import re
 
@@ -114,6 +115,15 @@ def test_boundaries(maze_file):
     assert all(h == '---' for h in north_boundary + south_boundary)
 
 
+@all_mazes
+def test_starting_cell_unique(maze_file):
+    """
+    The starting cell, if marked, must be unique.
+    """
+    rows = read_maze(maze_file)
+    assert Counter(''.join(rows))['S'] in (0, 1)
+
+
 @competition_mazes
 def test_starting_cell(maze_file):
     """