Ensure 100% coverage for time module

tests/time.be

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+import time
+
+# time.time() returns current unix timestamp as int
+var t = time.time()
+assert(type(t) == 'int')
+assert(t > 0)
+
+# time.clock() returns elapsed CPU time as real
+var c = time.clock()
+assert(type(c) == 'real')
+assert(c >= 0)
+
+# time.dump() with a known epoch: 2021-01-01 00:00:00 UTC = 1609459200
+var ts = 1609459200
+var d = time.dump(ts)
+assert(isinstance(d, map))
+assert(d['year'] == 2021)
+assert(d['month'] == 1)
+assert(d['epoch'] == ts)
+
+# all expected keys are present
+assert(d.contains('hour'))
+assert(d.contains('min'))
+assert(d.contains('sec'))
+assert(d.contains('day'))
+assert(d.contains('weekday'))
+
+# weekday is 0 (Sunday) through 6 (Saturday)
+assert(d['weekday'] >= 0 && d['weekday'] <= 6)
+
+# time.dump() with no argument returns nil (branch: be_top < 1)
+assert(time.dump() == nil)
+
+# time.dump() with a non-int argument returns nil (branch: !be_isint)
+assert(time.dump('hello') == nil)
+assert(time.dump(3.14) == nil)
+
+# time.dump() with another known timestamp: 2000-01-01 00:00:00 UTC = 946684800
+var d2 = time.dump(946684800)
+assert(isinstance(d2, map))
+assert(d2['year'] == 2000)
+assert(d2['epoch'] == 946684800)
+
+# time.dump() with epoch 0 = 1970-01-01 00:00:00 UTC
+var d0 = time.dump(0)
+assert(isinstance(d0, map))
+assert(d0['epoch'] == 0)
+assert(d0['weekday'] >= 0 && d0['weekday'] <= 6)
+
+# time.time() result is consistent with time.dump()
+var now = time.time()
+var nd = time.dump(now)
+assert(nd['year'] >= 2024)
+assert(nd['month'] >= 1 && nd['month'] <= 12)
+assert(nd['day'] >= 1 && nd['day'] <= 31)
+assert(nd['hour'] >= 0 && nd['hour'] <= 23)
+assert(nd['min'] >= 0 && nd['min'] <= 59)
+assert(nd['sec'] >= 0 && nd['sec'] <= 59)
+assert(nd['weekday'] >= 0 && nd['weekday'] <= 6)