time: Add unit test for time.strftime.

Signed-off-by: Damien George <damien@micropython.org>

python-stdlib/time/test_time.py

@@ -0,0 +1,42 @@
+import time
+import unittest
+
+DAYS = ("Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday")
+
+MONTHS = (
+    "January",
+    "February",
+    "March",
+    "April",
+    "May",
+    "June",
+    "July",
+    "August",
+    "September",
+    "October",
+    "November",
+    "December",
+)
+
+TIME_TUPLE = (2022, 12, 14, 0, 45, 17, 2, 348, 0)
+
+
+class TestStrftime(unittest.TestCase):
+    def test_not_formatting(self):
+        fmt = "a string with no formatting {}[]() 0123456789 !@#$^&*"
+        self.assertEqual(time.strftime(fmt, TIME_TUPLE), fmt)
+
+    def test_days(self):
+        for i, day in enumerate(DAYS):
+            t = (0, 0, 0, 0, 0, 0, i, 0, 0)
+            self.assertEqual(time.strftime("%a%A", t), day[:3] + day)
+
+    def test_months(self):
+        for i, month in enumerate(MONTHS):
+            t = (0, i + 1, 0, 0, 0, 0, 0, 0, 0)
+            self.assertEqual(time.strftime("%b%B", t), month[:3] + month)
+
+    def test_full(self):
+        fmt = "%Y-%m-%d %a %b %I:%M:%S %%%P%%"
+        expected = "2022-12-14 Wed Dec 00:45:17 %AM%"
+        self.assertEqual(time.strftime(fmt, TIME_TUPLE), expected)