Apply ruff/flake8-pytest-style rule PT027

PT027 Use `pytest.raises` instead of unittest-style `assertRaises`

tests/test_dicttoxml.py

@@ -63,11 +63,14 @@ def lazy_obj():
         assert unparse(lazy_obj()) == unparse(parse(unparse(lazy_obj())))
 
     def test_no_root(self):
-        self.assertRaises(ValueError, unparse, {})
+        with pytest.raises(ValueError):
+              unparse({})
 
     def test_multiple_roots(self):
-        self.assertRaises(ValueError, unparse, {'a': '1', 'b': '2'})
-        self.assertRaises(ValueError, unparse, {'a': ['1', '2', '3']})
+        with pytest.raises(ValueError):
+            unparse({'a': '1', 'b': '2'})
+        with pytest.raises(ValueError):
+            unparse({'a': ['1', '2', '3']})
 
     def test_no_root_nofulldoc(self):
         assert unparse({}, full_document=False) == ''

tests/test_xmltodict.py

@@ -92,9 +92,9 @@ def cb(path, item):
 
     def test_streaming_interrupt(self):
         cb = lambda path, item: False
-        self.assertRaises(ParsingInterrupted,
-                          parse, '<a>x</a>',
-                          item_depth=1, item_callback=cb)
+
+        with pytest.raises(ParsingInterrupted):
+            parse('<a>x</a>', item_depth=1, item_callback=cb)
 
     def test_streaming_generator(self):
         def cb(path, item):