Add docstrings for tests.utils.* (#23, #27)

tests/utils/__init__.py

@@ -0,0 +1 @@
+"""Tests for ``xentica.utils`` module."""

tests/utils/test_formatters.py

@@ -1,22 +1,28 @@
+"""Tests for ``xentica.utils.formatters`` module."""
 import unittest
 
 from xentica.utils.formatters import sizeof_fmt
 
 
 class TestSizeFormatter(unittest.TestCase):
+    """Tests for size formatter helper."""
 
     def test_less_kilo(self):
+        """Test less than Kilo rendering as plain values."""
         val = sizeof_fmt(345)
         self.assertEqual(val, "345", "Less Kilo format is incorrect.")
 
     def test_kilo(self):
+        """Test numbers between 10e3 and 10e6 has K postix."""
         val = sizeof_fmt(34567)
         self.assertEqual(val, "34.57K", "Kilo format is incorrect.")
 
     def test_peta(self):
+        """Test numbers between 10e15 and 10e18 has P postix."""
         val = sizeof_fmt(34567 * (10 ** 12))
         self.assertEqual(val, "34.57P", "Peta format is incorrect.")
 
     def test_yokta(self):
+        """Test numbers larger than 10e24 has Y postix."""
         val = sizeof_fmt(34567 * (10 ** 21))
         self.assertEqual(val, "34.57Y", "Yokta format is incorrect.")