TST: unit test for gh-13200

1 files changed, 14 insertions, 1 deletions

diff --git a/numpy/lib/tests/test_io.py b/numpy/lib/tests/test_io.py
index 835344429..030488b77 100644
--- a/numpy/lib/tests/test_io.py
+++ b/numpy/lib/tests/test_io.py
@@ -22,7 +22,7 @@ from numpy.ma.testutils import assert_equal
 from numpy.testing import (
     assert_warns, assert_, assert_raises_regex, assert_raises,
     assert_allclose, assert_array_equal, temppath, tempdir, IS_PYPY,
-    HAS_REFCOUNT, suppress_warnings, assert_no_gc_cycles,
+    HAS_REFCOUNT, suppress_warnings, assert_no_gc_cycles, assert_no_warnings
     )
 
 
@@ -1391,6 +1391,19 @@ M   33  21.99
         control = np.array([(1, 2), (3, 4)], dtype=[('col1', int), ('col2', int)])
         assert_equal(test, control)
 
+    def test_file_is_closed_on_error(self):
+        # gh-13200
+        with tempdir() as tmpdir:
+            fpath = os.path.join(tmpdir, "test.csv")
+            with open(fpath, "wb") as f:
+                f.write(u'\N{GREEK PI SYMBOL}'.encode('utf8'))
+
+            # ResourceWarnings are emitted from a destructor, so won't be
+            # detected by regular propagation to errors.
+            with assert_no_warnings():
+                with pytest.raises(UnicodeDecodeError):
+                    np.genfromtxt(fpath, encoding="ascii")
+
     def test_autonames_and_usecols(self):
         # Tests names and usecols
         data = TextIO('A B C D\n aaaa 121 45 9.1')