Improving functionalities and adding unit tests

tests/helpers.py

@@ -43,6 +43,12 @@ class Contains:
   """
   s: str
 
+@dataclasses.dataclass
+class DoesNotContain:
+  """
+  To check if the attribute does not contain a specific value
+  """
+  s: str
 
 @dataclasses.dataclass
 class JsonViewerNode:
@@ -449,6 +455,11 @@ def matches(actual, expected, path=""):
       elif isinstance(expected.attrs[expected_attr], Contains):
         assert expected.attrs[expected_attr].s in actual.attrs[expected_attr], \
           f"{print_path(path)}Attribute '{expected_attr}' does not contain '{expected.attrs[expected_attr].s}': actual='{actual.attrs[expected_attr]}', expected ='{expected.attrs[expected_attr].s}'."
+
+      elif isinstance(expected.attrs[expected_attr], DoesNotContain):
+        assert expected.attrs[expected_attr].s not in actual.attrs[expected_attr], \
+          f"{print_path(path)}Attribute '{expected_attr}' does contain '{expected.attrs[expected_attr].s}' while it must not: actual='{actual.attrs[expected_attr]}'."
+
       
       else:
         assert actual.attrs[expected_attr] == expected.attrs[expected_attr], \
@@ -750,13 +761,14 @@ def icon(name: str):
   return NotStr(f'<svg name="{name}"')
 
 
-def div_icon(name: str):
+def div_icon(name: str, cls=None):
   """
   Test if an element is an icon wrapped in a div
   :param name:
+  :param cls:
   :return:
   """
-  return Div(NotStr(f'<svg name="{name}"'))
+  return Div(NotStr(f'<svg name="{name}"'), cls=cls)
 
 
 def span_icon(name: str):