Core: ensure requirements files end on newline (#4761)

test/general/test_requirements.py

@@ -0,0 +1,19 @@
+import unittest
+import os
+
+
+class TestBase(unittest.TestCase):
+    def test_requirements_file_ends_on_newline(self):
+        """Test that all requirements files end on a newline"""
+        import Utils
+        requirements_files = [Utils.local_path("requirements.txt"),
+                              Utils.local_path("WebHostLib", "requirements.txt")]
+        worlds_path = Utils.local_path("worlds")
+        for entry in os.listdir(worlds_path):
+            requirements_path = os.path.join(worlds_path, entry, "requirements.txt")
+            if os.path.isfile(requirements_path):
+                requirements_files.append(requirements_path)
+        for requirements_file in requirements_files:
+            with self.subTest(path=requirements_file):
+                with open(requirements_file) as f:
+                    self.assertEqual(f.read()[-1], "\n")