Fix #2324: Make chromadb an optional dependency to support Alpine Linux

Co-Authored-By: Joe Moura <joao@crewai.com>

tests/test_optional_dependencies.py

@@ -0,0 +1,50 @@
+import importlib
+import sys
+from unittest import mock
+import pytest
+
+def test_rag_storage_without_chromadb():
+    # Mock the import to simulate chromadb not being installed
+    with mock.patch.dict(sys.modules, {'chromadb': None}):
+        # Force reload to ensure our mock takes effect
+        if 'crewai.memory.storage.rag_storage' in sys.modules:
+            importlib.reload(sys.modules['crewai.memory.storage.rag_storage'])
+        
+        # Now import and test
+        from crewai.memory.storage.rag_storage import RAGStorage
+        
+        # Should not raise an exception
+        storage = RAGStorage(type="test", allow_reset=True)
+        
+        # Methods should handle the case when chromadb is not available
+        assert storage.app is None
+        assert storage.collection is None
+        
+        # These methods should not raise exceptions
+        storage.save("test", {})
+        results = storage.search("test")
+        assert results == []
+        storage.reset()
+
+def test_knowledge_storage_without_chromadb():
+    # Mock the import to simulate chromadb not being installed
+    with mock.patch.dict(sys.modules, {'chromadb': None}):
+        # Force reload to ensure our mock takes effect
+        if 'crewai.knowledge.storage.knowledge_storage' in sys.modules:
+            importlib.reload(sys.modules['crewai.knowledge.storage.knowledge_storage'])
+        
+        # Now import and test
+        from crewai.knowledge.storage.knowledge_storage import KnowledgeStorage
+        
+        # Should not raise an exception
+        storage = KnowledgeStorage()
+        
+        # Methods should handle the case when chromadb is not available
+        assert storage.app is None
+        assert storage.collection is None
+        
+        # These methods should not raise exceptions
+        storage.initialize_knowledge_storage()
+        results = storage.search(["test"])
+        assert results == []
+        storage.reset()