diff --git a/cognee/tests/unit/modules/ontology/test_ontology_adapter.py b/cognee/tests/unit/modules/ontology/test_ontology_adapter.py
index 4757e2595..efb472c1e 100644
--- a/cognee/tests/unit/modules/ontology/test_ontology_adapter.py
+++ b/cognee/tests/unit/modules/ontology/test_ontology_adapter.py
@@ -331,3 +331,173 @@ def test_rdflib_ontology_resolver_default_matching_strategy():
 
     resolver = RDFLibOntologyResolver()
     assert isinstance(resolver.matching_strategy, FuzzyMatchingStrategy)
+
+
+def test_get_ontology_resolver_from_env_success():
+    """Test get_ontology_resolver_from_env returns correct resolver with valid parameters."""
+    from cognee.modules.ontology.get_default_ontology_resolver import get_ontology_resolver_from_env
+    from cognee.modules.ontology.rdf_xml.RDFLibOntologyResolver import RDFLibOntologyResolver
+    from cognee.modules.ontology.matching_strategies import FuzzyMatchingStrategy
+
+    resolver = get_ontology_resolver_from_env(
+        ontology_resolver="rdflib",
+        matching_strategy="fuzzy",
+        ontology_file_path="/test/path.owl"
+    )
+
+    assert isinstance(resolver, RDFLibOntologyResolver)
+    assert isinstance(resolver.matching_strategy, FuzzyMatchingStrategy)
+    assert resolver.ontology_file == "/test/path.owl"
+
+
+def test_get_ontology_resolver_from_env_unsupported_resolver():
+    """Test get_ontology_resolver_from_env raises EnvironmentError for unsupported resolver."""
+    from cognee.modules.ontology.get_default_ontology_resolver import get_ontology_resolver_from_env
+
+    with pytest.raises(EnvironmentError) as exc_info:
+        get_ontology_resolver_from_env(
+            ontology_resolver="unsupported",
+            matching_strategy="fuzzy",
+            ontology_file_path="/test/path.owl"
+        )
+
+    assert "Unsupported ontology resolver: unsupported" in str(exc_info.value)
+    assert "Supported resolvers are: RdfLib with FuzzyMatchingStrategy" in str(exc_info.value)
+
+
+def test_get_ontology_resolver_from_env_unsupported_strategy():
+    """Test get_ontology_resolver_from_env raises EnvironmentError for unsupported strategy."""
+    from cognee.modules.ontology.get_default_ontology_resolver import get_ontology_resolver_from_env
+
+    with pytest.raises(EnvironmentError) as exc_info:
+        get_ontology_resolver_from_env(
+            ontology_resolver="rdflib",
+            matching_strategy="unsupported",
+            ontology_file_path="/test/path.owl"
+        )
+
+    assert "Unsupported ontology resolver: rdflib" in str(exc_info.value)
+
+
+def test_get_ontology_resolver_from_env_empty_file_path():
+    """Test get_ontology_resolver_from_env raises EnvironmentError for empty file path."""
+    from cognee.modules.ontology.get_default_ontology_resolver import get_ontology_resolver_from_env
+
+    with pytest.raises(EnvironmentError) as exc_info:
+        get_ontology_resolver_from_env(
+            ontology_resolver="rdflib",
+            matching_strategy="fuzzy",
+            ontology_file_path=""
+        )
+
+    assert "Unsupported ontology resolver: rdflib" in str(exc_info.value)
+
+
+def test_get_ontology_resolver_from_env_none_file_path():
+    """Test get_ontology_resolver_from_env raises EnvironmentError for None file path."""
+    from cognee.modules.ontology.get_default_ontology_resolver import get_ontology_resolver_from_env
+
+    with pytest.raises(EnvironmentError) as exc_info:
+        get_ontology_resolver_from_env(
+            ontology_resolver="rdflib",
+            matching_strategy="fuzzy",
+            ontology_file_path=None
+        )
+
+    assert "Unsupported ontology resolver: rdflib" in str(exc_info.value)
+
+
+def test_get_ontology_resolver_from_env_empty_resolver():
+    """Test get_ontology_resolver_from_env raises EnvironmentError for empty resolver."""
+    from cognee.modules.ontology.get_default_ontology_resolver import get_ontology_resolver_from_env
+
+    with pytest.raises(EnvironmentError) as exc_info:
+        get_ontology_resolver_from_env(
+            ontology_resolver="",
+            matching_strategy="fuzzy",
+            ontology_file_path="/test/path.owl"
+        )
+
+    assert "Unsupported ontology resolver:" in str(exc_info.value)
+
+
+def test_get_ontology_resolver_from_env_empty_strategy():
+    """Test get_ontology_resolver_from_env raises EnvironmentError for empty strategy."""
+    from cognee.modules.ontology.get_default_ontology_resolver import get_ontology_resolver_from_env
+
+    with pytest.raises(EnvironmentError) as exc_info:
+        get_ontology_resolver_from_env(
+            ontology_resolver="rdflib",
+            matching_strategy="",
+            ontology_file_path="/test/path.owl"
+        )
+
+    assert "Unsupported ontology resolver: rdflib" in str(exc_info.value)
+
+
+def test_get_ontology_resolver_from_env_default_parameters():
+    """Test get_ontology_resolver_from_env with default empty parameters raises EnvironmentError."""
+    from cognee.modules.ontology.get_default_ontology_resolver import get_ontology_resolver_from_env
+
+    with pytest.raises(EnvironmentError) as exc_info:
+        get_ontology_resolver_from_env()
+
+    assert "Unsupported ontology resolver:" in str(exc_info.value)
+
+
+def test_get_ontology_resolver_from_env_case_sensitivity():
+    """Test get_ontology_resolver_from_env is case sensitive."""
+    from cognee.modules.ontology.get_default_ontology_resolver import get_ontology_resolver_from_env
+
+    with pytest.raises(EnvironmentError):
+        get_ontology_resolver_from_env(
+            ontology_resolver="RDFLIB",
+            matching_strategy="fuzzy",
+            ontology_file_path="/test/path.owl"
+        )
+
+    with pytest.raises(EnvironmentError):
+        get_ontology_resolver_from_env(
+            ontology_resolver="RdfLib",
+            matching_strategy="fuzzy",
+            ontology_file_path="/test/path.owl"
+        )
+
+
+def test_get_ontology_resolver_from_env_with_actual_file():
+    """Test get_ontology_resolver_from_env works with actual file path."""
+    from cognee.modules.ontology.get_default_ontology_resolver import get_ontology_resolver_from_env
+    from cognee.modules.ontology.rdf_xml.RDFLibOntologyResolver import RDFLibOntologyResolver
+    from cognee.modules.ontology.matching_strategies import FuzzyMatchingStrategy
+
+    resolver = get_ontology_resolver_from_env(
+        ontology_resolver="rdflib",
+        matching_strategy="fuzzy",
+        ontology_file_path="/path/to/ontology.owl"
+    )
+
+    assert isinstance(resolver, RDFLibOntologyResolver)
+    assert isinstance(resolver.matching_strategy, FuzzyMatchingStrategy)
+    assert resolver.ontology_file == "/path/to/ontology.owl"
+
+
+def test_get_ontology_resolver_from_env_resolver_functionality():
+    """Test that resolver created from env function works correctly."""
+    from cognee.modules.ontology.get_default_ontology_resolver import get_ontology_resolver_from_env
+
+    resolver = get_ontology_resolver_from_env(
+        ontology_resolver="rdflib",
+        matching_strategy="fuzzy",
+        ontology_file_path="/test/path.owl"
+    )
+
+    resolver.build_lookup()
+    assert isinstance(resolver.lookup, dict)
+
+    result = resolver.find_closest_match("test", "individuals")
+    assert result is None  # Should return None for non-existent entity
+
+    nodes, relationships, start_node = resolver.get_subgraph("test", "individuals")
+    assert nodes == []
+    assert relationships == []
+    assert start_node is None