Improve test documentation and coverage for LLM import

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

tests/test_import_llm.py

@@ -1,23 +1,65 @@
+"""Tests for LLM import functionality."""
+
 import pytest
 
+
+@pytest.fixture
+def bedrock_model_path():
+    """Fixture providing the standard Bedrock model path for testing."""
+    return "bedrock/anthropic.claude-3-sonnet-20240229-v1:0"
+
+
 def test_import_llm_from_crewai():
-    """Test that LLM can be imported directly from crewai."""
+    """
+    Test LLM import functionality from crewai package.
+    
+    Verifies:
+        - Direct import of LLM class from crewai package
+        - Import statement succeeds without raising exceptions
+    """
     try:
         from crewai import LLM
         assert LLM is not None
     except ImportError as e:
         pytest.fail(f"Failed to import LLM from crewai: {e}")
 
-def test_bedrock_llm_creation():
-    """Test that a Bedrock LLM can be created."""
+
+def test_bedrock_llm_creation(bedrock_model_path):
+    """
+    Test that a Bedrock LLM can be created with the correct model.
+    
+    Verifies:
+        - LLM can be instantiated with a Bedrock model
+        - The model property is correctly set to the Bedrock model path
+        - No exceptions are raised during instantiation
+    """
     try:
         from crewai import LLM
         
         # Just test the object creation, not the actual API call
-        bedrock_llm = LLM(
-            model="bedrock/anthropic.claude-3-sonnet-20240229-v1:0"
-        )
+        bedrock_llm = LLM(model=bedrock_model_path)
         assert bedrock_llm is not None
-        assert bedrock_llm.model == "bedrock/anthropic.claude-3-sonnet-20240229-v1:0"
+        assert bedrock_llm.model == bedrock_model_path
     except Exception as e:
         pytest.fail(f"Failed to create Bedrock LLM: {e}")
+
+
+
+def test_llm_with_invalid_model():
+    """
+    Test LLM creation with an invalid model name format.
+    
+    Verifies:
+        - LLM can be instantiated with any model string
+        - No validation errors occur during instantiation
+        - The model property is correctly set to the provided string
+    """
+    try:
+        from crewai import LLM
+        
+        invalid_model = "invalid-model-name"
+        llm = LLM(model=invalid_model)
+        assert llm is not None
+        assert llm.model == invalid_model
+    except Exception as e:
+        pytest.fail(f"Failed to create LLM with invalid model: {e}")