diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 82c66a3..82d31e5 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,24 +1,19 @@
 # This workflow will install Python dependencies, run tests and lint with a single version of Python
 # For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
 
-name: Python application
-
+name: Build and test
 on:
   push:
     branches: [ "main", "dev-json" ]
   pull_request:
     branches: [ "main" ]
   merge_group:
-
-permissions:
-  contents: read
-
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
     steps:
       - uses: actions/checkout@v4
       - name: Setup Python
@@ -29,7 +24,9 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install pytest
-          python -m install
+      - name: install xDEVS
+        run: |
+            python -m pip install .
       - name: Test with pytest
         run: |
           pytest
diff --git a/xdevs/models.py b/xdevs/models.py
index 692cbaa..b859e56 100644
--- a/xdevs/models.py
+++ b/xdevs/models.py
@@ -29,7 +29,8 @@ def __len__(self) -> int:
         return sum((len(port) for port in self._bag), len(self._values))
 
     def __str__(self) -> str:
-        return f'{self.name}<{self.p_type.__name__ if self.p_type is not None else 'None'}>'
+        p_type = self.p_type.__name__ if self.p_type is not None else 'None'
+        return f'{self.name}<{p_type}>'
 
     def __repr__(self) -> str:
         return str(self)
diff --git a/xdevs/plugins/input_handlers/bad_dependencies.py b/xdevs/plugins/input_handlers/bad_dependencies.py
index 6c864c3..bfcee17 100644
--- a/xdevs/plugins/input_handlers/bad_dependencies.py
+++ b/xdevs/plugins/input_handlers/bad_dependencies.py
@@ -9,7 +9,8 @@ def __init__(self, **kwargs):
         :param str handler_type: transducer type.
         """
         super().__init__(**kwargs)
-        raise ImportError(f'{kwargs.get('handler_type')} input handler specific dependencies are not imported')
+        handler_type = kwargs['handler_type']
+        raise ImportError(f'{handler_type} input handler specific dependencies are not imported')
 
     def run(self):
         pass
diff --git a/xdevs/plugins/output_handlers/bad_dependencies.py b/xdevs/plugins/output_handlers/bad_dependencies.py
index b1fe605..2b3ea18 100644
--- a/xdevs/plugins/output_handlers/bad_dependencies.py
+++ b/xdevs/plugins/output_handlers/bad_dependencies.py
@@ -9,7 +9,8 @@ def __init__(self, **kwargs):
         :param str handler_type: transducer type.
         """
         super().__init__(**kwargs)
-        raise ImportError(f'{kwargs['handler_type']} input handler specific dependencies are not imported')
+        handler_type = kwargs['handler_type']
+        raise ImportError(f'{handler_type} input handler specific dependencies are not imported')
 
     def run(self):
         pass
diff --git a/xdevs/plugins/transducers/bad_dependencies.py b/xdevs/plugins/transducers/bad_dependencies.py
index d03cbf2..a76943d 100644
--- a/xdevs/plugins/transducers/bad_dependencies.py
+++ b/xdevs/plugins/transducers/bad_dependencies.py
@@ -9,7 +9,8 @@ def __init__(self, **kwargs):
         :param str transducer_type: transducer type.
         """
         super().__init__(**kwargs)
-        raise ImportError(f'{kwargs.get('transducer_type')} transducer specific dependencies are not imported')
+        transducer_type = kwargs['transducer_type']
+        raise ImportError(f'{transducer_type} transducer specific dependencies are not imported')
 
     def create_known_data_types_map(self):
         pass
diff --git a/xdevs/plugins/wrappers/bad_dependencies.py b/xdevs/plugins/wrappers/bad_dependencies.py
index d37c58e..858e410 100644
--- a/xdevs/plugins/wrappers/bad_dependencies.py
+++ b/xdevs/plugins/wrappers/bad_dependencies.py
@@ -9,7 +9,8 @@ def __init__(self, **kwargs):
         :param str wrapper_type: wrapper type.
         """
         super().__init__(**kwargs)
-        raise ImportError(f'{kwargs['wrapper_type']} wrapper specific dependencies are not installed')
+        wrapper_type = kwargs['wrapper_type']
+        raise ImportError(f'{wrapper_type} wrapper specific dependencies are not installed')
 
     def deltint(self):
         pass