1 files changed, 23 insertions, 0 deletions
diff --git a/numpy/lib/tests/test_io.py b/numpy/lib/tests/test_io.py
index a0bc2e135..d73d50959 100644
--- a/numpy/lib/tests/test_io.py
+++ b/numpy/lib/tests/test_io.py
@@ -3177,3 +3177,26 @@ def test_loadtxt_quote_support_default():
 
     res = np.loadtxt(txt, dtype=dtype, delimiter=",", quotechar='"')
     assert_array_equal(res, expected)
+
+
+def test_loadtxt_quotechar_multichar_error():
+    txt = StringIO("1,2\n3,4")
+    msg = r".*must be a single unicode character or None"
+    with pytest.raises(TypeError, match=msg):
+        np.loadtxt(txt, delimiter=",", quotechar="''")
+
+
+def test_loadtxt_comment_multichar_error_with_quote():
+    txt = StringIO("1,2\n3,4")
+    msg = (
+        "when multiple comments or a multi-character comment is given, "
+        "quotes are not supported."
+    )
+    with pytest.raises(ValueError, match=msg):
+        np.loadtxt(txt, delimiter=",", comments="123", quotechar='"')
+    with pytest.raises(ValueError, match=msg):
+        np.loadtxt(txt, delimiter=",", comments=["#", "%"], quotechar='"')
+
+    # A single character string in a tuple is unpacked though:
+    res = np.loadtxt(txt, delimiter=",", comments=("#",), quotechar="'")
+    assert_equal(res, [[1, 2], [3, 4]])