diff --git a/package/PartSegCore/algorithm_describe_base.py b/package/PartSegCore/algorithm_describe_base.py
index 5c859f8c0..c47a15cf0 100644
--- a/package/PartSegCore/algorithm_describe_base.py
+++ b/package/PartSegCore/algorithm_describe_base.py
@@ -313,18 +313,18 @@ def check_function(ob, function_name, is_class):
     def __setitem__(self, key: str, value: AlgorithmType):
         if not issubclass(value, AlgorithmDescribeBase):
             raise ValueError(
-                f"Class {value} need to inherit from {AlgorithmDescribeBase.__module__}.AlgorithmDescribeBase"
+                f"Class {value} need to be subclass of {AlgorithmDescribeBase.__module__}.AlgorithmDescribeBase"
             )
         self.check_function(value, "get_name", True)
         self.check_function(value, "get_fields", True)
         try:
             val = value.get_name()
-        except NotImplementedError:
-            raise ValueError(f"Method get_name of class {value} need to be implemented") from None
+        except (NotImplementedError, AttributeError):
+            raise ValueError(f"Class {value} need to implement classmethod 'get_name'") from None
         if not isinstance(val, str):
             raise ValueError(f"Function get_name of class {value} need return string not {type(val)}")
         if key != val:
-            raise ValueError("Object need to be registered under name returned by gey_name function")
+            raise ValueError("Object need to be registered under name returned by get_name function")
         if not value.__new_style__:
             try:
                 val = value.get_fields()
diff --git a/package/tests/test_PartSegCore/test_algorithm_describe_base.py b/package/tests/test_PartSegCore/test_algorithm_describe_base.py
index e7230726b..528690108 100644
--- a/package/tests/test_PartSegCore/test_algorithm_describe_base.py
+++ b/package/tests/test_PartSegCore/test_algorithm_describe_base.py
@@ -130,11 +130,14 @@ def get_fields(cls):
     with pytest.raises(ValueError, match="Class .* need to implement classmethod 'get_name'"):
         TestSelection.register(Alg2)
 
+    with pytest.raises(ValueError, match="Class .* need to implement classmethod 'get_name'"):
+        TestSelection.__register__["test1"] = Alg2
+
     with pytest.raises(ValueError, match="Function get_name of class .* need return string not .*int"):
         TestSelection.register(Alg3)
 
 
-def test_register_name_collsion():
+def test_register_name_collision():
     class TestSelection(AlgorithmSelection):
         pass
 
@@ -154,7 +157,7 @@ def get_name(cls):
 
         @classmethod
         def get_fields(cls):
-            return []
+            return []  # pragma: no cover
 
     class Alg3(AlgorithmDescribeBase):
         @classmethod
@@ -177,6 +180,80 @@ def get_fields(cls):
         TestSelection.register(Alg3, old_names=["0"])
 
 
+def test_register_not_subclass():
+    class TestSelection(AlgorithmSelection):
+        pass
+
+    class Alg1:
+        @classmethod
+        def get_name(cls):
+            return "1"
+
+        @classmethod
+        def get_fields(cls):
+            return []
+
+    with pytest.raises(ValueError, match="Class .* need to be subclass of .*AlgorithmDescribeBase"):
+        TestSelection.register(Alg1)
+
+
+def test_register_validate_name_assignment():
+    class TestSelection(AlgorithmSelection):
+        pass
+
+    class Alg1(AlgorithmDescribeBase):
+        @classmethod
+        def get_name(cls):
+            return "1"
+
+        @classmethod
+        def get_fields(cls):
+            return []
+
+    class Alg2(Alg1):
+        @classmethod
+        def get_name(cls):
+            return 2
+
+    with pytest.raises(ValueError, match="need return string"):
+        TestSelection.__register__["1"] = Alg2
+
+    with pytest.raises(ValueError, match="under name returned by get_name function"):
+        TestSelection.__register__["2"] = Alg1
+
+
+def test_register_get_fields_validity():
+    class TestSelection(AlgorithmSelection):
+        pass
+
+    class Alg1(AlgorithmDescribeBase):
+        @classmethod
+        def get_name(cls):
+            return "1"
+
+        @classmethod
+        def get_fields(cls):
+            raise NotImplementedError
+
+    class Alg2(Alg1):
+        @classmethod
+        def get_fields(cls):
+            return ()
+
+    with pytest.raises(ValueError, match="need to be implemented"):
+        TestSelection.register(Alg1)
+    with pytest.raises(ValueError, match="need return list not"):
+        TestSelection.register(Alg2)
+
+
+def test_register_no_default_value():
+    class TestSelection(AlgorithmSelection):
+        pass
+
+    with pytest.raises(ValueError, match="Register does not contain any algorithm"):
+        TestSelection.get_default()
+
+
 def test_algorithm_selection_convert_subclass(clean_register):
     class TestSelection(AlgorithmSelection):
         pass