diff options
Diffstat (limited to 'tests')
| -rw-r--r-- | tests/extmod/time_mktime.py | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/tests/extmod/time_mktime.py b/tests/extmod/time_mktime.py new file mode 100644 index 0000000000..7fc643dc3c --- /dev/null +++ b/tests/extmod/time_mktime.py @@ -0,0 +1,120 @@ +# test conversion from date tuple to timestamp and back + +try: + import time + + time.localtime +except (ImportError, AttributeError): + print("SKIP") + raise SystemExit + +# Range of date expected to work on all MicroPython platforms +MIN_YEAR = 1970 +MAX_YEAR = 2099 +# CPython properly supported date range: +# - on Windows: year 1970 to 3000+ +# - on Unix: year 1583 to 3000+ + +# Start test from Jan 1, 2001 13:00 (Feb 2000 might already be broken) +SAFE_DATE = (2001, 1, 1, 13, 0, 0, 0, 0, -1) + + +# mktime function that checks that the result is reversible +def safe_mktime(date_tuple): + try: + res = time.mktime(date_tuple) + chk = time.localtime(res) + except OverflowError: + print("safe_mktime:", date_tuple, "overflow error") + return None + if chk[0:5] != date_tuple[0:5]: + print("safe_mktime:", date_tuple[0:5], " -> ", res, " -> ", chk[0:5]) + return None + return res + + +# localtime function that checks that the result is reversible +def safe_localtime(timestamp): + try: + res = time.localtime(timestamp) + chk = time.mktime(res) + except OverflowError: + print("safe_localtime:", timestamp, "overflow error") + return None + if chk != timestamp: + print("safe_localtime:", timestamp, " -> ", res, " -> ", chk) + return None + return res + + +# look for smallest valid timestamps by iterating backwards on tuple +def test_bwd(date_tuple): + curr_stamp = safe_mktime(date_tuple) + year = date_tuple[0] + month = date_tuple[1] - 1 + if month < 1: + year -= 1 + month = 12 + while year >= MIN_YEAR: + while month >= 1: + next_tuple = (year, month) + date_tuple[2:] + next_stamp = safe_mktime(next_tuple) + # at this stage, only test consistency and monotonicity + if next_stamp is None or next_stamp >= curr_stamp: + return date_tuple + date_tuple = next_tuple + curr_stamp = next_stamp + month -= 1 + year -= 1 + month = 12 + return date_tuple + + +# test day-by-day to ensure that every date is properly converted +def test_fwd(start_date): + DAYS_PER_MONTH = (0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31) + curr_stamp = safe_mktime(start_date) + curr_date = safe_localtime(curr_stamp) + while curr_date[0] <= MAX_YEAR: + if curr_date[2] < 15: + skip_days = 13 + else: + skip_days = 1 + next_stamp = curr_stamp + skip_days * 86400 + next_date = safe_localtime(next_stamp) + if next_date is None: + return curr_date + if next_date[2] != curr_date[2] + skip_days: + # next month + if next_date[2] != 1: + print("wrong day of month:", next_date) + return curr_date + # check the number of days in previous month + month_days = DAYS_PER_MONTH[curr_date[1]] + if month_days == 28 and curr_date[0] % 4 == 0: + if curr_date[0] % 100 != 0 or curr_date[0] % 400 == 0: + month_days += 1 + if curr_date[2] != month_days: + print("wrong day count in prev month:", curr_date[2], "vs", month_days) + return curr_date + if next_date[1] != curr_date[1] + 1: + # next year + if curr_date[1] != 12: + print("wrong month count in prev year:", curr_date[1]) + return curr_date + if next_date[1] != 1: + print("wrong month:", next_date) + return curr_date + if next_date[0] != curr_date[0] + 1: + print("wrong year:", next_date) + return curr_date + curr_stamp = next_stamp + curr_date = next_date + return curr_date + + +small_date = test_bwd(SAFE_DATE) +large_date = test_fwd(small_date) +print("tested from", small_date[0:3], "to", large_date[0:3]) +print(small_date[0:3], "wday is", small_date[6]) +print(large_date[0:3], "wday is", large_date[6]) |