Add test

Author: phofl

pandas/tests/io/xml/test_xml.py

@@ -782,6 +782,19 @@ def test_read_xml_passing_as_positional_deprecated(datapath):
         )
 
 
+@td.skip_if_no("lxml")
+def test_wrong_encoding_for_lxml():
+    # GH#45133
+    data = """<data>
+  <row>
+    <a>c</a>
+  </row>
+</data>
+"""
+    with pytest.raises(TypeError, match="encoding None"):
+        read_xml(StringIO(data), parser="lxml", encoding=None)
+
+
 @td.skip_if_no("lxml")
 def test_stylesheet_file_like(datapath, mode):
     kml = datapath("io", "data", "xml", "cta_rail_lines.kml")