43 lines
1.1 KiB
Python
43 lines
1.1 KiB
Python
try:
|
|
from time import ticks_diff, ticks_add
|
|
except ImportError:
|
|
print("SKIP")
|
|
raise SystemExit
|
|
|
|
# Maximum value returned from ticks_add, ticks_ms, etc.
|
|
TICKS_MAX = ticks_add(0, -1)
|
|
# Maximum value returned from ticks_diff.
|
|
TICKS_INTERVAL_MAX = TICKS_MAX // 2
|
|
|
|
# Invariants:
|
|
# - ticks_diff(ticks_add(T, delta), T) == delta
|
|
# - ticks_diff(T, ticks_add(T, delta)) == -delta
|
|
|
|
# Check actual values of ticks_add.
|
|
print(ticks_add(20, 12))
|
|
print(ticks_add(20, -12))
|
|
|
|
# Check invariant.
|
|
print(ticks_diff(ticks_add(100, 123), 100))
|
|
print(ticks_diff(ticks_add(100, -123), 100))
|
|
print(ticks_diff(100, ticks_add(100, 123)))
|
|
print(ticks_diff(100, ticks_add(100, -123)))
|
|
|
|
# Check limits.
|
|
for T in (0, 10, TICKS_MAX):
|
|
for delta in (
|
|
-TICKS_INTERVAL_MAX - 1,
|
|
-TICKS_INTERVAL_MAX,
|
|
0,
|
|
TICKS_INTERVAL_MAX,
|
|
TICKS_INTERVAL_MAX + 1,
|
|
):
|
|
try:
|
|
print(ticks_diff(ticks_add(T, delta), T) == delta)
|
|
except OverflowError:
|
|
print("OverflowError")
|
|
try:
|
|
print(ticks_diff(T, ticks_add(T, delta)) == -delta)
|
|
except OverflowError:
|
|
print("OverflowError")
|