refactor: move src and tests from lib/crewai to root

tests/rag/config/test_optional_imports.py

@@ -0,0 +1,22 @@
+"""Tests for optional imports."""
+
+import pytest
+
+from crewai.rag.config.optional_imports.base import _MissingProvider
+from crewai.rag.config.optional_imports.providers import MissingChromaDBConfig
+
+
+def test_missing_provider_raises_runtime_error():
+    """Test that _MissingProvider raises RuntimeError on instantiation."""
+    with pytest.raises(
+        RuntimeError, match="provider '__missing__' requested but not installed"
+    ):
+        _MissingProvider()
+
+
+def test_missing_chromadb_config_raises_runtime_error():
+    """Test that MissingChromaDBConfig raises RuntimeError on instantiation."""
+    with pytest.raises(
+        RuntimeError, match="provider 'chromadb' requested but not installed"
+    ):
+        MissingChromaDBConfig()