diff --git a/src/corelibs/var_handling/enum_base.py b/src/corelibs/var_handling/enum_base.py
new file mode 100644
index 0000000..fa2b967
--- /dev/null
+++ b/src/corelibs/var_handling/enum_base.py
@@ -0,0 +1,75 @@
+"""
+Enum base classes
+"""
+
+from enum import Enum
+from typing import Any
+
+
+class EnumBase(Enum):
+    """
+    base for enum
+    lookup_any and from_any will return "EnumBase" and the sub class name
+    run the return again to "from_any" to get a clean value, or cast it
+    """
+
+    @classmethod
+    def lookup_key(cls, enum_key: str):
+        """Lookup from key side (must be string)"""
+        # if there is a ":", then this is legacy, replace with ___
+        if ":" in enum_key:
+            enum_key = enum_key.replace(':', '___')
+        try:
+            return cls[enum_key.upper()]
+        except KeyError as e:
+            raise ValueError(f"Invalid key: {enum_key}") from e
+        except AttributeError as e:
+            raise ValueError(f"Invalid key: {enum_key}") from e
+
+    @classmethod
+    def lookup_value(cls, enum_value: Any):
+        """Lookup through value side"""
+        try:
+            return cls(enum_value)
+        except ValueError as e:
+            raise ValueError(f"Invalid value: {enum_value}") from e
+
+    @classmethod
+    def from_any(cls, enum_any: Any):
+        """
+        This only works in the following order
+        -> class itself, as is
+        -> str, assume key lookup
+        -> if failed try other
+
+        Arguments:
+            enum_any {Any} -- _description_
+
+        Returns:
+            _type_ -- _description_
+        """
+        if isinstance(enum_any, cls):
+            return enum_any
+        # try key first if it is string
+        # if failed try value
+        if isinstance(enum_any, str):
+            try:
+                return cls.lookup_key(enum_any)
+            except (ValueError, AttributeError):
+                try:
+                    return cls.lookup_value(enum_any)
+                except ValueError as e:
+                    raise ValueError(f"Could not find as key or value: {enum_any}") from e
+        return cls.lookup_value(enum_any)
+
+    def to_value(self) -> Any:
+        """Convert to value"""
+        return self.value
+
+    def to_lower_case(self) -> str:
+        """return lower case"""
+        return self.name.lower()
+
+    def __str__(self) -> str:
+        """return [Enum].NAME like it was called with .name"""
+        return self.name
diff --git a/test-run/var_handling/enum_test.py b/test-run/var_handling/enum_test.py
new file mode 100644
index 0000000..33e3ab0
--- /dev/null
+++ b/test-run/var_handling/enum_test.py
@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+
+"""
+Enum handling
+"""
+
+from corelibs.var_handling.enum_base import EnumBase
+
+
+class TestBlock(EnumBase):
+    """Test block enum"""
+    BLOCK_A = "block_a"
+    HAS_NUM = 5
+
+
+def main() -> None:
+    """
+    Comment
+    """
+
+    print(f"BLOCK A: {TestBlock.from_any('BLOCK_A')}")
+    print(f"HAS NUM: {TestBlock.from_any(5)}")
+    print(f"DIRECT BLOCK: {TestBlock.BLOCK_A.name} -> {TestBlock.BLOCK_A.value}")
+
+
+if __name__ == "__main__":
+    main()
+
+# __END__
diff --git a/tests/unit/var_handling/__init__.py b/tests/unit/var_handling/__init__.py
new file mode 100644
index 0000000..1bfbaf1
--- /dev/null
+++ b/tests/unit/var_handling/__init__.py
@@ -0,0 +1,3 @@
+"""
+var_handling tests
+"""
diff --git a/tests/unit/var_handling/test_enum_base.py b/tests/unit/var_handling/test_enum_base.py
new file mode 100644
index 0000000..5ec1dcf
--- /dev/null
+++ b/tests/unit/var_handling/test_enum_base.py
@@ -0,0 +1,546 @@
+"""
+var_handling.enum_base tests
+"""
+
+from typing import Any
+import pytest
+from corelibs.var_handling.enum_base import EnumBase
+
+
+class SampleBlock(EnumBase):
+    """Sample block enum for testing purposes"""
+    BLOCK_A = "block_a"
+    BLOCK_B = "block_b"
+    HAS_NUM = 5
+    HAS_FLOAT = 3.14
+    LEGACY_KEY = "legacy_value"
+
+
+class SimpleEnum(EnumBase):
+    """Simple enum with string values"""
+    OPTION_ONE = "one"
+    OPTION_TWO = "two"
+    OPTION_THREE = "three"
+
+
+class NumericEnum(EnumBase):
+    """Enum with only numeric values"""
+    FIRST = 1
+    SECOND = 2
+    THIRD = 3
+
+
+class TestEnumBaseLookupKey:
+    """Test cases for lookup_key class method"""
+
+    def test_lookup_key_valid_uppercase(self):
+        """Test lookup_key with valid uppercase key"""
+        result = SampleBlock.lookup_key("BLOCK_A")
+        assert result == SampleBlock.BLOCK_A
+        assert result.name == "BLOCK_A"
+        assert result.value == "block_a"
+
+    def test_lookup_key_valid_lowercase(self):
+        """Test lookup_key with valid lowercase key (should convert to uppercase)"""
+        result = SampleBlock.lookup_key("block_a")
+        assert result == SampleBlock.BLOCK_A
+        assert result.name == "BLOCK_A"
+
+    def test_lookup_key_valid_mixed_case(self):
+        """Test lookup_key with mixed case key"""
+        result = SampleBlock.lookup_key("BlOcK_a")
+        assert result == SampleBlock.BLOCK_A
+        assert result.name == "BLOCK_A"
+
+    def test_lookup_key_with_numeric_enum(self):
+        """Test lookup_key with numeric enum member"""
+        result = SampleBlock.lookup_key("HAS_NUM")
+        assert result == SampleBlock.HAS_NUM
+        assert result.value == 5
+
+    def test_lookup_key_legacy_colon_replacement(self):
+        """Test lookup_key with legacy colon format (converts : to ___)"""
+        # This assumes the enum has a key that might be accessed with legacy format
+        # Should convert : to ___ and look up LEGACY___KEY
+        # Since we don't have this key, we test the behavior with a valid conversion
+        # Let's test with a known key that would work
+        with pytest.raises(ValueError, match="Invalid key"):
+            SampleBlock.lookup_key("BLOCK:A")  # Should fail as BLOCK___A doesn't exist
+
+    def test_lookup_key_invalid_key(self):
+        """Test lookup_key with invalid key"""
+        with pytest.raises(ValueError, match="Invalid key: NONEXISTENT"):
+            SampleBlock.lookup_key("NONEXISTENT")
+
+    def test_lookup_key_empty_string(self):
+        """Test lookup_key with empty string"""
+        with pytest.raises(ValueError, match="Invalid key"):
+            SampleBlock.lookup_key("")
+
+    def test_lookup_key_with_special_characters(self):
+        """Test lookup_key with special characters that might cause AttributeError"""
+        with pytest.raises(ValueError, match="Invalid key"):
+            SampleBlock.lookup_key("@#$%")
+
+    def test_lookup_key_numeric_string(self):
+        """Test lookup_key with numeric string that isn't a key"""
+        with pytest.raises(ValueError, match="Invalid key"):
+            SampleBlock.lookup_key("123")
+
+
+class TestEnumBaseLookupValue:
+    """Test cases for lookup_value class method"""
+
+    def test_lookup_value_valid_string(self):
+        """Test lookup_value with valid string value"""
+        result = SampleBlock.lookup_value("block_a")
+        assert result == SampleBlock.BLOCK_A
+        assert result.name == "BLOCK_A"
+        assert result.value == "block_a"
+
+    def test_lookup_value_valid_integer(self):
+        """Test lookup_value with valid integer value"""
+        result = SampleBlock.lookup_value(5)
+        assert result == SampleBlock.HAS_NUM
+        assert result.name == "HAS_NUM"
+        assert result.value == 5
+
+    def test_lookup_value_valid_float(self):
+        """Test lookup_value with valid float value"""
+        result = SampleBlock.lookup_value(3.14)
+        assert result == SampleBlock.HAS_FLOAT
+        assert result.name == "HAS_FLOAT"
+        assert result.value == 3.14
+
+    def test_lookup_value_invalid_string(self):
+        """Test lookup_value with invalid string value"""
+        with pytest.raises(ValueError, match="Invalid value: nonexistent"):
+            SampleBlock.lookup_value("nonexistent")
+
+    def test_lookup_value_invalid_integer(self):
+        """Test lookup_value with invalid integer value"""
+        with pytest.raises(ValueError, match="Invalid value: 999"):
+            SampleBlock.lookup_value(999)
+
+    def test_lookup_value_case_sensitive(self):
+        """Test that lookup_value is case-sensitive for string values"""
+        with pytest.raises(ValueError, match="Invalid value"):
+            SampleBlock.lookup_value("BLOCK_A")  # Value is "block_a", not "BLOCK_A"
+
+
+class TestEnumBaseFromAny:
+    """Test cases for from_any class method"""
+
+    def test_from_any_with_enum_instance(self):
+        """Test from_any with an enum instance (should return as-is)"""
+        enum_instance = SampleBlock.BLOCK_A
+        result = SampleBlock.from_any(enum_instance)
+        assert result is enum_instance
+        assert result == SampleBlock.BLOCK_A
+
+    def test_from_any_with_string_as_key(self):
+        """Test from_any with string that matches a key"""
+        result = SampleBlock.from_any("BLOCK_A")
+        assert result == SampleBlock.BLOCK_A
+        assert result.name == "BLOCK_A"
+        assert result.value == "block_a"
+
+    def test_from_any_with_string_as_key_lowercase(self):
+        """Test from_any with lowercase string key"""
+        result = SampleBlock.from_any("block_a")
+        # Should first try as key (convert to uppercase and find BLOCK_A)
+        assert result == SampleBlock.BLOCK_A
+
+    def test_from_any_with_string_as_value(self):
+        """Test from_any with string that only matches a value"""
+        # Use a value that isn't also a valid key
+        result = SampleBlock.from_any("block_b")
+        # Should try key first (fail), then value (succeed)
+        assert result == SampleBlock.BLOCK_B
+        assert result.value == "block_b"
+
+    def test_from_any_with_integer(self):
+        """Test from_any with integer value"""
+        result = SampleBlock.from_any(5)
+        assert result == SampleBlock.HAS_NUM
+        assert result.value == 5
+
+    def test_from_any_with_float(self):
+        """Test from_any with float value"""
+        result = SampleBlock.from_any(3.14)
+        assert result == SampleBlock.HAS_FLOAT
+        assert result.value == 3.14
+
+    def test_from_any_with_invalid_string(self):
+        """Test from_any with string that doesn't match key or value"""
+        with pytest.raises(ValueError, match="Could not find as key or value: invalid_string"):
+            SampleBlock.from_any("invalid_string")
+
+    def test_from_any_with_invalid_integer(self):
+        """Test from_any with integer that doesn't match any value"""
+        with pytest.raises(ValueError, match="Invalid value: 999"):
+            SampleBlock.from_any(999)
+
+    def test_from_any_string_key_priority(self):
+        """Test that from_any tries key lookup before value for strings"""
+        # Create an enum where a value matches another key
+        class AmbiguousEnum(EnumBase):
+            KEY_A = "key_b"  # Value is the name of another key
+            KEY_B = "value_b"
+
+        # When we look up "KEY_B", it should find it as a key, not as value "key_b"
+        result = AmbiguousEnum.from_any("KEY_B")
+        assert result == AmbiguousEnum.KEY_B
+        assert result.value == "value_b"
+
+
+class TestEnumBaseToValue:
+    """Test cases for to_value instance method"""
+
+    def test_to_value_string_value(self):
+        """Test to_value with string enum value"""
+        result = SampleBlock.BLOCK_A.to_value()
+        assert result == "block_a"
+        assert isinstance(result, str)
+
+    def test_to_value_integer_value(self):
+        """Test to_value with integer enum value"""
+        result = SampleBlock.HAS_NUM.to_value()
+        assert result == 5
+        assert isinstance(result, int)
+
+    def test_to_value_float_value(self):
+        """Test to_value with float enum value"""
+        result = SampleBlock.HAS_FLOAT.to_value()
+        assert result == 3.14
+        assert isinstance(result, float)
+
+    def test_to_value_equals_value_attribute(self):
+        """Test that to_value returns the same as .value"""
+        enum_instance = SampleBlock.BLOCK_A
+        assert enum_instance.to_value() == enum_instance.value
+
+
+class TestEnumBaseToLowerCase:
+    """Test cases for to_lower_case instance method"""
+
+    def test_to_lower_case_uppercase_name(self):
+        """Test to_lower_case with uppercase enum name"""
+        result = SampleBlock.BLOCK_A.to_lower_case()
+        assert result == "block_a"
+        assert isinstance(result, str)
+
+    def test_to_lower_case_mixed_name(self):
+        """Test to_lower_case with name containing underscores"""
+        result = SampleBlock.HAS_NUM.to_lower_case()
+        assert result == "has_num"
+
+    def test_to_lower_case_consistency(self):
+        """Test that to_lower_case always returns lowercase"""
+        for member in SampleBlock:
+            result = member.to_lower_case()
+            assert result == result.lower()
+            assert result == member.name.lower()
+
+
+class TestEnumBaseStrMethod:
+    """Test cases for __str__ magic method"""
+
+    def test_str_returns_name(self):
+        """Test that str() returns the enum name"""
+        result = str(SampleBlock.BLOCK_A)
+        assert result == "BLOCK_A"
+        assert result == SampleBlock.BLOCK_A.name
+
+    def test_str_all_members(self):
+        """Test str() for all enum members"""
+        for member in SampleBlock:
+            result = str(member)
+            assert result == member.name
+            assert isinstance(result, str)
+
+    def test_str_in_formatting(self):
+        """Test that str works in string formatting"""
+        formatted = f"Enum: {SampleBlock.BLOCK_A}"
+        assert formatted == "Enum: BLOCK_A"
+
+    def test_str_vs_repr(self):
+        """Test difference between str and repr"""
+        enum_instance = SampleBlock.BLOCK_A
+        str_result = str(enum_instance)
+        repr_result = repr(enum_instance)
+
+        assert str_result == "BLOCK_A"
+        # repr should include class name
+        assert "SampleBlock" in repr_result
+
+
+# Parametrized tests for comprehensive coverage
+class TestParametrized:
+    """Parametrized tests for better coverage"""
+
+    @pytest.mark.parametrize("key,expected_member", [
+        ("BLOCK_A", SampleBlock.BLOCK_A),
+        ("block_a", SampleBlock.BLOCK_A),
+        ("BLOCK_B", SampleBlock.BLOCK_B),
+        ("HAS_NUM", SampleBlock.HAS_NUM),
+        ("has_num", SampleBlock.HAS_NUM),
+        ("HAS_FLOAT", SampleBlock.HAS_FLOAT),
+    ])
+    def test_lookup_key_parametrized(self, key: str, expected_member: EnumBase):
+        """Test lookup_key with various valid keys"""
+        result = SampleBlock.lookup_key(key)
+        assert result == expected_member
+
+    @pytest.mark.parametrize("value,expected_member", [
+        ("block_a", SampleBlock.BLOCK_A),
+        ("block_b", SampleBlock.BLOCK_B),
+        (5, SampleBlock.HAS_NUM),
+        (3.14, SampleBlock.HAS_FLOAT),
+        ("legacy_value", SampleBlock.LEGACY_KEY),
+    ])
+    def test_lookup_value_parametrized(self, value: Any, expected_member: EnumBase):
+        """Test lookup_value with various valid values"""
+        result = SampleBlock.lookup_value(value)
+        assert result == expected_member
+
+    @pytest.mark.parametrize("input_any,expected_member", [
+        ("BLOCK_A", SampleBlock.BLOCK_A),
+        ("block_a", SampleBlock.BLOCK_A),
+        ("block_b", SampleBlock.BLOCK_B),
+        (5, SampleBlock.HAS_NUM),
+        (3.14, SampleBlock.HAS_FLOAT),
+        (SampleBlock.BLOCK_A, SampleBlock.BLOCK_A),  # Pass enum instance
+    ])
+    def test_from_any_parametrized(self, input_any: Any, expected_member: EnumBase):
+        """Test from_any with various valid inputs"""
+        result = SampleBlock.from_any(input_any)
+        assert result == expected_member
+
+    @pytest.mark.parametrize("invalid_key", [
+        "NONEXISTENT",
+        "invalid",
+        "123",
+        "",
+        "BLOCK_C",
+    ])
+    def test_lookup_key_invalid_parametrized(self, invalid_key: str):
+        """Test lookup_key with various invalid keys"""
+        with pytest.raises(ValueError, match="Invalid key"):
+            SampleBlock.lookup_key(invalid_key)
+
+    @pytest.mark.parametrize("invalid_value", [
+        "nonexistent",
+        999,
+        -1,
+        0.0,
+        "BLOCK_A",  # This is a key name, not a value
+    ])
+    def test_lookup_value_invalid_parametrized(self, invalid_value: Any):
+        """Test lookup_value with various invalid values"""
+        with pytest.raises(ValueError, match="Invalid value"):
+            SampleBlock.lookup_value(invalid_value)
+
+
+# Edge cases and special scenarios
+class TestEdgeCases:
+    """Test edge cases and special scenarios"""
+
+    def test_enum_with_single_member(self):
+        """Test EnumBase with only one member"""
+        class SingleEnum(EnumBase):
+            ONLY_ONE = "single"
+
+        result = SingleEnum.from_any("ONLY_ONE")
+        assert result == SingleEnum.ONLY_ONE
+        assert result.to_value() == "single"
+
+    def test_enum_iteration(self):
+        """Test iterating over enum members"""
+        members = list(SampleBlock)
+        assert len(members) == 5
+        assert SampleBlock.BLOCK_A in members
+        assert SampleBlock.BLOCK_B in members
+        assert SampleBlock.HAS_NUM in members
+
+    def test_enum_membership(self):
+        """Test checking membership in enum"""
+        assert SampleBlock.BLOCK_A in SampleBlock
+        assert SampleBlock.HAS_NUM in SampleBlock
+
+    def test_enum_comparison(self):
+        """Test comparing enum members"""
+        assert SampleBlock.BLOCK_A == SampleBlock.BLOCK_A
+        assert SampleBlock.BLOCK_A != SampleBlock.BLOCK_B
+        assert SampleBlock.from_any("BLOCK_A") == SampleBlock.BLOCK_A
+
+    def test_enum_identity(self):
+        """Test enum member identity"""
+        member1 = SampleBlock.BLOCK_A
+        member2 = SampleBlock.lookup_key("BLOCK_A")
+        member3 = SampleBlock.from_any("BLOCK_A")
+
+        assert member1 is member2
+        assert member1 is member3
+        assert member2 is member3
+
+    def test_different_enum_classes(self):
+        """Test that different enum classes are distinct"""
+        # Even if they have same keys/values, they're different
+        class OtherEnum(EnumBase):
+            BLOCK_A = "block_a"
+
+        result1 = SampleBlock.from_any("BLOCK_A")
+        result2 = OtherEnum.from_any("BLOCK_A")
+
+        assert result1 != result2
+        assert not isinstance(result1, type(result2))
+
+    def test_numeric_enum_operations(self):
+        """Test operations specific to numeric enums"""
+        assert NumericEnum.FIRST.to_value() == 1
+        assert NumericEnum.SECOND.to_value() == 2
+        assert NumericEnum.THIRD.to_value() == 3
+
+        # Test from_any with integers
+        assert NumericEnum.from_any(1) == NumericEnum.FIRST
+        assert NumericEnum.from_any(2) == NumericEnum.SECOND
+
+    def test_mixed_value_types_in_same_enum(self):
+        """Test enum with mixed value types"""
+        # SampleBlock already has mixed types (strings, int, float)
+        assert isinstance(SampleBlock.BLOCK_A.to_value(), str)
+        assert isinstance(SampleBlock.HAS_NUM.to_value(), int)
+        assert isinstance(SampleBlock.HAS_FLOAT.to_value(), float)
+
+    def test_from_any_chained_calls(self):
+        """Test that from_any can be chained (idempotent)"""
+        result1 = SampleBlock.from_any("BLOCK_A")
+        result2 = SampleBlock.from_any(result1)
+        result3 = SampleBlock.from_any(result2)
+
+        assert result1 == result2 == result3
+        assert result1 is result2 is result3
+
+
+# Integration tests
+class TestIntegration:
+    """Integration tests combining multiple methods"""
+
+    def test_round_trip_key_lookup(self):
+        """Test round-trip from key to enum and back"""
+        original_key = "BLOCK_A"
+        enum_member = SampleBlock.lookup_key(original_key)
+        result_name = str(enum_member)
+
+        assert result_name == original_key
+
+    def test_round_trip_value_lookup(self):
+        """Test round-trip from value to enum and back"""
+        original_value = "block_a"
+        enum_member = SampleBlock.lookup_value(original_value)
+        result_value = enum_member.to_value()
+
+        assert result_value == original_value
+
+    def test_from_any_workflow(self):
+        """Test realistic workflow using from_any"""
+        # Simulate receiving various types of input
+        inputs = [
+            "BLOCK_A",  # Key as string
+            "block_b",  # Value as string
+            5,          # Numeric value
+            SampleBlock.HAS_FLOAT,  # Already an enum
+        ]
+
+        expected = [
+            SampleBlock.BLOCK_A,
+            SampleBlock.BLOCK_B,
+            SampleBlock.HAS_NUM,
+            SampleBlock.HAS_FLOAT,
+        ]
+
+        for input_val, expected_val in zip(inputs, expected):
+            result = SampleBlock.from_any(input_val)
+            assert result == expected_val
+
+    def test_enum_in_dictionary(self):
+        """Test using enum as dictionary key"""
+        enum_dict = {
+            SampleBlock.BLOCK_A: "Value A",
+            SampleBlock.BLOCK_B: "Value B",
+            SampleBlock.HAS_NUM: "Value Num",
+        }
+
+        assert enum_dict[SampleBlock.BLOCK_A] == "Value A"
+        block_b = SampleBlock.from_any("BLOCK_B")
+        assert isinstance(block_b, SampleBlock)
+        assert enum_dict[block_b] == "Value B"
+
+    def test_enum_in_set(self):
+        """Test using enum in a set"""
+        enum_set = {SampleBlock.BLOCK_A, SampleBlock.BLOCK_B, SampleBlock.BLOCK_A}
+
+        assert len(enum_set) == 2  # BLOCK_A should be deduplicated
+        assert SampleBlock.BLOCK_A in enum_set
+        assert SampleBlock.from_any("BLOCK_B") in enum_set
+
+
+# Real-world usage scenarios
+class TestRealWorldScenarios:
+    """Test real-world usage scenarios from enum_test.py"""
+
+    def test_original_enum_test_scenario(self):
+        """Test the scenario from the original enum_test.py"""
+        # BLOCK A: {SampleBlock.from_any('BLOCK_A')}
+        result_a = SampleBlock.from_any('BLOCK_A')
+        assert result_a == SampleBlock.BLOCK_A
+        assert str(result_a) == "BLOCK_A"
+
+        # HAS NUM: {SampleBlock.from_any(5)}
+        result_num = SampleBlock.from_any(5)
+        assert result_num == SampleBlock.HAS_NUM
+        assert result_num.to_value() == 5
+
+        # DIRECT BLOCK: {SampleBlock.BLOCK_A.name} -> {SampleBlock.BLOCK_A.value}
+        assert SampleBlock.BLOCK_A.name == "BLOCK_A"
+        assert SampleBlock.BLOCK_A.value == "block_a"
+
+    def test_config_value_parsing(self):
+        """Test parsing values from configuration (common use case)"""
+        # Simulate config values that might come as strings
+        config_values = ["OPTION_ONE", "option_two", "OPTION_THREE"]
+
+        results = [SimpleEnum.from_any(val) for val in config_values]
+
+        assert results[0] == SimpleEnum.OPTION_ONE
+        assert results[1] == SimpleEnum.OPTION_TWO
+        assert results[2] == SimpleEnum.OPTION_THREE
+
+    def test_api_response_mapping(self):
+        """Test mapping API response values to enum"""
+        # Simulate API returning numeric codes
+        api_codes = [1, 2, 3]
+
+        results = [NumericEnum.from_any(code) for code in api_codes]
+
+        assert results[0] == NumericEnum.FIRST
+        assert results[1] == NumericEnum.SECOND
+        assert results[2] == NumericEnum.THIRD
+
+    def test_validation_with_error_handling(self):
+        """Test validation with proper error handling"""
+        valid_input = "BLOCK_A"
+        invalid_input = "INVALID"
+
+        # Valid input should work
+        result = SampleBlock.from_any(valid_input)
+        assert result == SampleBlock.BLOCK_A
+
+        # Invalid input should raise ValueError
+        try:
+            SampleBlock.from_any(invalid_input)
+            assert False, "Should have raised ValueError"
+        except ValueError as e:
+            assert "Could not find as key or value" in str(e)
+            assert "INVALID" in str(e)