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-rw-r--r--numpy/ma/tests/test_old_ma.py7
1 files changed, 7 insertions, 0 deletions
diff --git a/numpy/ma/tests/test_old_ma.py b/numpy/ma/tests/test_old_ma.py
index ab003b94e..7ac4c328f 100644
--- a/numpy/ma/tests/test_old_ma.py
+++ b/numpy/ma/tests/test_old_ma.py
@@ -697,6 +697,13 @@ class TestMa:
assert_equal(b[0].shape, ())
assert_equal(b[1].shape, ())
+ def test_assignment_by_condition(self):
+ # Test for gh-18951
+ a = array([1, 2, 3, 4], mask=[1, 0, 1, 0])
+ c = a>=3
+ a[c] = 5
+ assert_(a[2] is masked)
+
class TestUfuncs:
def setup(self):