1 files changed, 21 insertions, 0 deletions
diff --git a/numpy/ma/tests/test_deprecations.py b/numpy/ma/tests/test_deprecations.py
index 14f697375..3e0e09fdd 100644
--- a/numpy/ma/tests/test_deprecations.py
+++ b/numpy/ma/tests/test_deprecations.py
@@ -1,10 +1,13 @@
 """Test deprecation and future warnings.
 
 """
+import pytest
 import numpy as np
 from numpy.testing import assert_warns
 from numpy.ma.testutils import assert_equal
 from numpy.ma.core import MaskedArrayFutureWarning
+import io
+import textwrap
 
 class TestArgsort:
     """ gh-8701 """
@@ -66,3 +69,21 @@ class TestMinimumMaximum:
         result = ma_max(data1d)
         assert_equal(result, ma_max(data1d, axis=None))
         assert_equal(result, ma_max(data1d, axis=0))
+
+
+class TestFromtextfile:
+    def test_fromtextfile_delimitor(self):
+        # NumPy 1.22.0, 2021-09-23
+
+        textfile = io.StringIO(textwrap.dedent(
+            """
+            A,B,C,D
+            'string 1';1;1.0;'mixed column'
+            'string 2';2;2.0;
+            'string 3';3;3.0;123
+            'string 4';4;4.0;3.14
+            """
+        ))
+
+        with pytest.warns(DeprecationWarning):
+            result = np.ma.mrecords.fromtextfile(textfile, delimitor=';')