Resolved code smells in test suite

Author: LucaCappelletti94

tests/__init__.py

@@ -0,0 +1 @@
+"""Test suite for the `transpose-dict` package."""

tests/test_transpose_dict.py

@@ -1,10 +1,14 @@
-from transpose_dict import TD
+"""Tests for transpose_dict package."""
+
 import json
+from transpose_dict import TD
+
 
 def test_transpose_dict():
-    with open("tests/start.json", "r") as f:
+    """Test transpose_dict function."""
+    with open("tests/start.json", "r", encoding="utf8") as f:
         start = json.load(f)
     for i in range(3):
-        with open("tests/test_{i}.json".format(i=i), "r") as f:
+        with open(f"tests/test_{i}.json", "r", encoding="utf8") as f:
             print(TD(start, i))
-            assert json.load(f) == TD(start, i)
+            assert json.load(f) == TD(start, i)

tests/test_version.py

@@ -5,5 +5,6 @@
 
 
 def test_version():
+    """Test the version string for PEP440 compatibility."""
     pattern = re.compile(r"\d+\.\d+\.\d+")
     assert pattern.match(__version__)