Maybe a test? [for review by DRMaccIver]

tests/cover/test_datetimes.py

@@ -21,11 +21,14 @@
 
 from flaky import flaky
 
-from hypothesis import given, settings
+from hypothesis import find, given, settings
 from tests.common.debug import minimal
-from hypothesis.strategies import dates, times, datetimes, timedeltas
+from hypothesis.strategies import none, dates, times, binary, datetimes, \
+    timedeltas
 from hypothesis.strategytests import strategy_test_suite
 from hypothesis.internal.compat import hrange
+from hypothesis.searchstrategy.datetime import DatetimeStrategy
+from hypothesis.internal.conjecture.data import ConjectureData
 
 TestStandardDescriptorFeatures_timedeltas1 = strategy_test_suite(timedeltas())
 
@@ -89,6 +92,19 @@ def test_bordering_on_a_leap_year():
     assert x.year == 2004
 
 
+def test_DatetimeStrategy_draw_may_fail():
+    strat = DatetimeStrategy(dt.datetime.min, dt.datetime.max, none())
+    failure_inducing = find(
+        binary(min_size=30),
+        lambda b: strat._attempt_one_draw(
+            ConjectureData.for_buffer(b)) is None
+    )
+    data = ConjectureData.for_buffer(failure_inducing)
+    data.draw(strat)  # Should raise some kind of error?
+    assert data.buffer
+    assert data.buffer == failure_inducing[:len(data.buffer)]
+
+
 TestStandardDescriptorFeatures_dates1 = strategy_test_suite(dates())